Krell Industries Stereo Amplifier EVOLUTION TWO MONAURAL PREAMPLIFIER User Manual

EVOLUTION  
EVOLUTION TWO  
MONAURAL PREAMPLIFIER  
OWNER’S REFERENCE  
 
Contents  
List of Illustrations, page iv  
A Letter from Dan D’Agostino, page 1  
SECTION ONE: About Krell, page 3  
The Krell Legacy, Revolutionary Krell CAST Technology,  
Ensuring Maximum Performance, Definition of Terms  
SECTION TWO: Unpacking and Placement, page 11  
Opening the Evolution Two Shipping Carton  
SECTION THREE: Quick Start, page 13  
Connecting the Evolution to Your System,  
Operating the Evolution Two  
SECTION FOUR: Anatomy of an Evolution Two, page 15  
Front Panel Description, Remote Control Description,  
and Back Panel Description  
SECTION FIVE: Connecting the Evolution Two to Your System, page 26  
Input and Output Connections, Connection Steps,  
Connections Using CAN Link  
SECTION SIX: Evolution Two Operation, page 29  
On/Off and Stand-by Operation, Play and Record,  
Operation Using CAN Link  
SECTION SEVEN: Customizing the Evolution Two, page 32  
Navigation Conventions, Menu Functions  
SECTION EIGHT: Questions and Answers, page 49  
Troubleshooting System Noise  
APPENDIX: CAN Link and Multiple Evolution Two Preamplifiers, page 51  
WARRANTY, page 53  
RETURN AUTHORIZATION PROCEDURE, page 55  
SPECIFICATIONS, page 56  
iii  
 
List of Illustrations  
Figure 1, page 15  
Evolution Two Preamplifier Chassis and  
Power Supply Chassis Front Panels  
Inset Evolution Two Preamplifier Channel: Front Panel View  
Figure 2, page 16  
Evolution Two Remote Control  
Figure 3, page 22  
Evolution Two Preamplifier Chassis and  
Power Supply Chassis Back Panels  
iv  
 
A Letter from Dan D’Agostino  
Dear Audio Enthusiast,  
Thank you for your purchase of the Evolution Two preamplifier.  
My new Evolution products represent a watershed in my design philosophy and in  
my quest for audio components that deliver absolute truth in music reproduction.  
The expanse of the Evolution Two monaural design has allowed me to explore  
fully the advantages of current mode topologies. The resulting circuit utilizes no  
feedback and has a bandwidth of 2 MHz.  
I have always been fascinated by the artistry inherent in great musical performanc-  
es, and my new Evolution Two preamplifier delivers the these performances in  
their entirety, unaltered, to the amplifier. At the same time, the Evolution Two pre-  
amplifier provides the flexibility and control necessary for the listener to thoroughly  
enjoy a high performance audio system. It is my pleasure to make the Evolution  
products available to you.  
The preamplifier plays a vital role in audio playback. At no other point in the repro-  
duction process is the music so vulnerable to change. The signal level at the pre-  
amplifier stage is small, and is particularly susceptible to noise and distortion. In  
order to solve this problem, the Evolution Two employs Krell Current Mode gain  
stages from input to output, and Current Audio Signal Transmission (CAST)  
receivers and transmitters. Unprecedented in Krell design history, these unique  
topologies combine in the Evolution Two preamplifier to form a circuit that has no  
audible sonic signature.  
The Evolution Series represents a new direction for Krell, where breakthrough cir-  
cuit topologies also represent the vanguard in convenience and control. Sophisti-  
cated communication circuitry allows from two to eight preamplifiers to be linked  
to a single master from which all user interface is accomplished. The Evolution  
Two Monaural Preamplifier is designed to complement perfectly the Evolution One  
Monaural Power Amplifier. Combine the Evolution One and Two with my new  
LAT-1000 loudspeakers, and experience the extraordinary capabilities of an  
Evolution System.  
continued  
1
 
(A Letter from Dan D’Agostino continued)  
I have some exciting news for you. Work on a new source component for the  
Evolution Series is ongoing as of this writing. Possessed of the unique Evolution  
technologies that power the amplifier and preamplifier, this Evolution source will  
expose the real advantages of the latest recording formats while taking compact  
disc playback to the next level. I encourage you to audition it as soon as it is  
released.  
Sincerely,  
Daniel D’Agostino  
Chief Executive Officer  
2
 
SECTION  
ONE  
About Krell  
This section describes the Krell Legacy, the innovative features and technology of  
the Evolution Two, and defines CAST and other key terms used in this reference.  
The Krell Legacy  
“I design every Krell component to set the standard  
for workmanship, style, and performance.”  
Dan D’Agostino  
High-end audio is a demanding pursuit—an ongoing quest for excellence in music  
reproduction that drives equipment manufacturers to strive for the absolute in  
design and performance. With a keen understanding of this passionate drive, Krell  
Industries, Inc., was founded in 1980.  
Over the past 2-1/2 decades, Krell has earned a distinguished reputation for engi-  
neering innovation and product excellence. The company’s history is replete with  
product introductions that have deeply impacted the high-end audio industry. The  
most discriminating audiophiles and product reviewers have consistently recog-  
nized Krell components for standard-setting performance.  
From the company’s inception to the present, Krell C.E.O. Dan D’Agostino has  
continually “pushed the envelope” of performance in audio. His exploration of new  
technologies, driven by his never-ending quest to elevate the standard of excel-  
lence, has resulted in breakthrough audio designs. Evolution Two preamplifiers  
build on this Krell legacy.  
Dan D’Agostino remains committed to the development of new designs and tech-  
nologies. And the Krell legacy will continue to evolve with products that deliver  
innovative engineering, perfection in build quality, and outstanding audio perform-  
ance.  
continued  
3
 
(SECTION ONE: About Krell continued)  
Revolutionary Krell CAST Technology  
Current Audio Signal Transmission, termed CAST, is a revolutionary method of  
connecting analog audio components for unparalleled sonic performance.  
Innovative engineering combines the new Krell CAST circuitry with existing Krell  
Current Mode technology to create entire CAST systems that reproduce music  
with incredible range, tonality, and precision.  
The Voltage Signal Transmission  
and the Traditional Audio System  
Traditionally, signal is transmitted in the voltage domain between two components.  
In an audio system, each component is a discrete entity with unique characteris-  
tics that act upon the musical signal independently. Each component is unaware  
of the other components in the system. The cables that connect the components  
also have their own electrical characteristics, which affect the sonic presentation  
of the entire system. CAST transmission unifies individual components and inter-  
connects into an electrically linked whole. The original signal remains unaltered  
from source to speaker.  
CAST Basics  
Here is how a CAST audio system works. Internally, each CAST source transfers,  
or amplifies, current using Krell Current Mode circuitry. This current signal is then  
output using CAST circuitry. When the signal is received by a CAST input, Krell  
Current Mode circuitry again takes over until the signal reaches the loudspeaker.  
By maintaining the musical signal in the current domain from beginning to end, an  
entire CAST system behaves as if it is one component. With CAST, circuit board  
properties and signal transmission aberrations between components are eliminat-  
ed. Cable impedances and their effects on the transmitted signal are non-existent.  
How CAST and Krell Current Mode Interact  
While CAST is a new method of transferring the musical signal between compo-  
nents, its origin stems from Krell Current Mode, the technology developed to  
transfer the musical signal within a component. CAST combined with Krell Current  
Mode takes circuitry signal transmission to the next evolutionary level. In essence,  
Krell Current Mode maintains the integrity of the signal within the component and  
4
 
CAST preserves the transmitted signal between components. Together, CAST and  
Krell Current Mode technologies unify separate Krell components into a single  
global circuit. Krell Current Mode technology enjoys bandwidth increases up to an  
order of magnitude greater than their voltage based counterparts. This dramatic  
increase in circuit bandwidth delivers near perfection in the audible band that typi-  
cally suffers from phase distortions in voltage circuits.  
CAST Cable Construction  
A CAST system uses cables manufactured by Krell and other manufacturers spe-  
cially licensed by Krell. Thin and flexible CAST cables are constructed with the  
same build quality as other Krell components and are aesthetically matched to the  
components that Krell manufactures. An all-metal body and locking connectors  
with gold contacts are part of the standard no-compromise specification devel-  
oped for every CAST cable made.  
Evolution CAST  
By employing radical current mirror circuitry, the Evolution components elevate the  
CAST technology to another level. This advanced use of the technology increases  
the linearity, transient speed, and bandwidth of the Evolution components while  
reducing the distortion by an order of magnitude.  
The Best Musical Performance  
When you operate a CAST system, you will hear significant improvements in every  
performance area: speed, precision, dynamic range, depth and width of the sound  
stage, transient impact, tonal balance, harmonic distortion, and more. The goal for  
CAST is the same company goal used for all Krell products. Krell strives for the  
delivery of the best performance of a musical event for you, using the full expres-  
sion of technology to date.  
continued  
5
 
(SECTION ONE: About Krell continued)  
Ensuring Maximum Performance  
“My pursuit of excellence in sound reproduction and  
my love of great musical performance fuels the ongoing  
Evolution design effort at Krell.”  
Dan D’Agostino  
The product of breakthrough Krell technology, the Evolution Two Monaural  
Preamplifier works in tandem with the Evolution One Monaural Power Amplifier to  
provide a sound that is supremely dynamic and musical. Indeed, it is the sound of  
the music itself.  
Core Technologies  
Zero Feedback Balanced Current Mode Design  
The signal path is fully complementary and fully balanced from input to output. All  
transistors operate in Class A mode. CAST inputs drive a newly designed current-  
mode balanced input stage, which uses a unique topology able to reject com-  
mon-mode input noise over an unusually wide bandwidth.  
Single-ended and balanced inputs drive a dynamically-cascoded JFET buffer,  
which has tremendous open-loop linearity and very high input impedance, to elim-  
inate loading effects. The voltage signals are then converted into balanced current  
signals, the form in which they remain through the remainder of the signal path.  
The audio signal remains in the current domain throughout the entire preamplifier.  
Only at the single-ended and voltage outputs is it converted back to the voltage  
domain.  
All signal gain is realized in the current domain using proprietary multiple-output  
current mirrors with nearly 500 times the open loop linearity of other designs.  
Negative feedback is not used anywhere in the Evolution Two preamplifier, nor is it  
necessary. Open-loop distortion is typically less than 0.005% (50 parts per mil-  
lion), and the open loop bandwidth extends to two megahertz. The result is an  
extraordinarily wide and deep image, with an open, effortless sound.  
The signal switching relays are hermetically sealed and use gold-plated bifurcated  
contacts for maximum signal integrity. Where needed multiple relays are connect-  
ed in a “T” configuration to virtually eliminate crosstalk from unselected inputs.  
The volume setting can be adjusted and displayed either numerically, from 0 to  
151, or in dB, from –inf to +12.0 dB.  
6
 
Fully Balanced Discrete Volume Control  
The volume control is realized with a 16-bit balanced resistor ladder, which uses  
low-resistance, high-linearity solid-state switches and discrete precision resistors.  
Control signals for the switches are optically coupled for low noise and maximum  
signal integrity. The bandwidth and transient response of the preamplifier circuitry  
are virtually unaffected by the volume setting. As a result high frequencies sound  
especially smooth and extended, and music seems to emerge from “jet black”  
silence. The analog and digital signal paths are not interconnected. Where neces-  
sary, digital control signals are optically coupled to analog circuits.  
The Evolution Two has two buffered tape outputs: one linked to the main signal-  
selection bus, and another with its own independent signal-selection bus. This  
allows the option of listening to one source while recording another, or the option  
of connecting two tape decks having different input signals. Both tape outputs  
have single-ended and voltage outputs. Either the fourth single-ended input or the  
third balanced input can be user-configured as a tape monitor input, allowing the  
opportunity to use home or professional recording equipment.  
Separate Power Supply  
Housed in a separate chassis, the power supply makes use of extensive electrical  
and magnetic shielding to keep radiated interference out of critical preamplifier cir-  
cuits. Internal line conditioning circuitry filters RF noise on the AC power, and  
compensates for asymmetric power waveforms and DC on the mains.  
Power for the analog stages comes from a large 170 VA toroidal transformer. This  
transformer drives four 8-amp bridge rectifiers and 39,600 microfarads of filter  
capacitance. Each monaural preamplifier has as much power supply capability as  
many stereo power amplifiers.  
The main regulators for the analog stages are scaled-down versions of those used  
to power the output stages of the Evolution One amplifier. Operating in current  
mode, with fully complementary gain stages and output drivers, wide bandwidth,  
low output impedance, and high current capability, the main regulators easily  
exceed the requirements of the analog stages. The driver and output stages in the  
main analog regulators use five pairs of 150 Volt, 8 Amp, 40 megahertz power  
transistors.  
A dedicated 90 VA toroidal transformer with three independent secondary wind-  
ings powers the preamplifier's digital control circuitry. The regulators for the con-  
continued  
7
 
(SECTION ONE: About Krell continued)  
(Separate Power Supply continued)  
trol circuitry team ultra-stable voltage reference chips with the same discrete high-  
current driver and output transistors used in the main analog regulators. These  
ample power reserves are brought to the Evolution Two via high reliability 12-pin  
connectors with machined, gold plated, three-amp contacts.  
Secondary voltage regulators for each analog stage in the Evolution Two provide  
ultra-quiet, rock-solid supply rails, as well as complete isolation between all the  
analog stages.  
When the Evolution Two is placed in stand-by, all the analog circuitry continues to  
operate at the same bias current; however, the main analog supply voltages  
decrease by 30 percent. The result is a corresponding 30 percent reduction in  
power consumption and heat without the need to wait for the electronics to  
“warm up” before listening.  
Advanced Microprocessor Control  
and Custom Software  
A user menu allows extensive customization of the preamplifier operation, includ-  
ing (but not limited to) input names, input-specific gain trims, Theater Through-  
put™, display brightness, and 12-volt triggers. Integration is supported via RS-  
232,12 Volt trigger, and RC-5 inputs, as well as an IR transmitter for programming  
a learning remote control.  
A built-in digital network allows multiple preamplifiers to be linked together, blend-  
ing the convenience of a single-chassis stereo preamplifier with the sonic perform-  
ance obtainable only from individual monaural preamplifiers. Six or more preampli-  
fier channels can be “daisy-chained” together and controlled simultaneously for  
multi-zone or home theater applications. The digital link allows the user settings in  
one preamplifier channel to be conveniently “cloned” to other linked preamplifier  
channels. Similarly, upgraded software in one preamplifier channel can be installed  
in other preamplifier channels using the digital link.  
In the event that the DC level at any of the preamplifier channel outputs exceeds a  
nominal level, sophisticated protection circuitry safely mutes the outputs, traces  
the source of the excess DC, and displays a diagnostic message on the main dis-  
play. On power-up, the microprocessor verifies that all the circuit boards in the  
preamplifier channel are properly connected and are compatible with the version  
of software installed.  
8
 
Definition of Terms  
Following are the definitions of key terms used in this owner’s reference.  
Configurations  
CAN Link  
The communication system that links multiple Evolution Two preamplifier channels  
is a sophisticated system called a controller area network (CAN).  
Linked Mode  
In linked mode, functions including power, volume, balance, phase, record, mute,  
and input selections are instantaneously transmitted between linked preamplifier  
channels. Evolution Two preamplifiers use CAN Link to operate in linked mode.  
Clone  
A method of transmitting custom configurations between linked preamplifier chan-  
nels.  
Inputs and Outputs  
Balanced  
A symmetrical input or output circuit that has equal impedance from both input  
terminals to a common ground reference point. The industry standard for profes-  
sional and sound recording installations, balanced connections have 6 dB more  
gain than single-ended connections and allow the use of long interconnect cables.  
Balanced connections are completely immune to induced noise from the system  
or the environment.  
CAST and Evolution CAST  
Krell Current Audio Signal Transmission, or CAST, is a proprietary Krell circuit tech-  
nology for connecting analog components, transmitting the audio waveform  
between components in the current domain rather than in the voltage domain. The  
speed and bandwidth provided by Krell CAST and its circuitry update, Evolution  
CAST, yield accurate, realistic music reproduction, enabling connected compo-  
nents to perform as if they are all part of a single circuit.  
Single-ended  
A two-wire input or output circuit. Single-ended connections are not recommend-  
ed for connections requiring long cable runs. Use care when using single-ended  
connections, because the ground connection is made last and broken first. Turn  
the system off/on prior to making or breaking single-ended connections.  
continued  
9
 
(SECTION ONE: About Krell continued)  
Preamplifier  
Channel  
Also termed preamplifier or preamplifier channel. A channel is one Evolution Two,  
comprised of one preamplifier chassis and one power supply chassis.  
Right-terminated channel  
Any right preamplifier channel that is last in a chain of linked Evolution preampli-  
fiers is referred to as right-terminated. There is only one RG-45 link cable connect-  
ed to a right-terminated channel.  
Transmitter  
Also termed transmitter preamplifier. The transmitter is a right-terminated preampli-  
fier channel that sends IR, RC-5, and RS-232 data to the other linked preamplifier  
channel(s), or receiver(s).  
Receiver  
Also termed receiver preamplifier. Receivers are linked preamplifier channels that  
receive IR, RC 5, and RS-232 data from a right terminated preamplifier channel, or  
transmitter.  
Operation  
Off  
When the stand-by/power LEDs and the backlight grid are not illuminated, the pre-  
amplifier is off.  
Stand-by  
A low power consumption status that keeps the audio and regulator circuits at  
idle. The stand-by/power LEDs are illuminated in red, when the preamplifier chan-  
nel is in the stand-by mode. Krell recommends leaving the preamplifier in the  
stand-by mode when it is not playing music.  
Operation  
When the backlight is illuminated in blue, the preamplifier is in the operational  
mode and ready to play music.  
Technology  
Krell Current Mode  
A proprietary Krell circuit topology in which the audio gain stages of a component  
operate in the current rather than voltage domain. This unique technology provides  
the component with exceptional speed, and a wide bandwidth.  
10  
 
SECTION  
TWO  
Unpacking and Placement  
This section describes the procedures for safely unpacking and placing your  
Evolution Two Monaural Preamplifier. Each Evolution Two preamplifier channel is  
shipped in 1 carton consisting of 2 chassis: 1 power supply chassis and 1 pream-  
plifier chassis.  
Opening the Evolution Two Shipping Carton  
Each Evolution Two shipping carton measures 22.3 in. (56.6 cm) wide by 23.5 in.  
(59.7 cm) high by 16.2 in. (41.1 cm) deep.  
Preamplifier Chassis. Each preamplifier chassis measures 17.3 in. (43.8 cm) wide  
by 3.7 in. (9.5 cm) high by 18.5 in. (47 cm) deep, and weighs 21 lbs. (9.5 kg).  
Power Supply Chassis. Each power supply chassis measures 17.3 in. (43.8 cm)  
wide by 3.7 in. (9.5 cm) high by 17.3 in. (43.8 cm) deep, and weighs 31 lbs.  
(14 kg).  
Left/Right Channel Orientation  
Evolution Two preamplifier channels are assembled as left or right channels.  
Preamplifier RCA connectors (31, 36, 38, 40) are color coded. Left preamplifier  
channels are assembled with white RCA connectors, and right preamplifier chan-  
nels are assembled with red RCA connectors.  
To Remove the Preamplifier Channel  
from the Shipping Carton  
1. Open a shipping carton and remove the top layer of foam. You see these  
items:  
1 Evolution Two preamplifier chassis  
1 Evolution Two power supply chassis  
1 AC Power cord  
1 12-pin DC cable  
1 RJ-45 control cable  
1 remote control  
2 AAA-size 1.5 Volt batteries for the remote  
1 T-10 Torx wrench for the remote control  
1 packet containing the owner’s reference and warranty card  
continued  
11  
 
(SECTION TWO: Unpacking and Placement continued)  
(To Remove the Preamplifier from the Shipping Box continued)  
2. Carefully remove the preamplifier chassis, power supply chassis, and acces-  
sories from the box.  
3. Place the the preamplifier chassis and power supply chassis in a safe location  
and remove the protective plastic wrapping.  
4. Place the power supply chassis where you intend to use the assembled pre-  
amplifier.  
Krell recommends that you place the preamplifier chassis on top of the power  
supply chassis. You can make 2 identical preamplifier/power supply stacks, as  
individual left and right channels, or one 4-chassis stack, with both channels  
combined in one stack.  
5. Repeat Steps 1-5 for the remaining preamplifier channel(s).  
Placement  
Before you install an Evolution Two preamplifier into your system, please follow the  
guidelines in this section to select a location for your component. This will facili-  
tate a clean, trouble-free installation.  
The Evolution Two preamplifier does not require a special rack or cabinet for  
installation. Each preamplifier channel measures 17.3 in (43.8 cm) wide by 7.3 in.  
(18.5 cm) high by 18.5 in. (47 cm) deep.  
The Evolution Two preamplifier requires at least 2 inches of clearance on each side  
and at least two inches of clearance above the component to provide adequate  
ventilation. Installation inside cabinetry may require additional ventilation.  
AC Power Guidelines  
The Evolution Two preamplifier has superb regulation and does not require a dedi-  
cated AC circuit. Avoid connections through extension cords or multiple AC  
adapters. High quality 15 amp AC strips are acceptable. The use of AC line condi-  
tioning devices is not recommended. The features provided by these devices are  
already on board the Evolution Two. For more information, see Separate Power  
Supply, on page 7.  
12  
 
SECTION  
THREE  
Quick Start  
To access the full array of available functions for the Evolution Two Monaural  
Preamplifier, please read the entire owner’s reference manual. The abbreviated  
routine in this Quick Start section will allow you to connect and operate the  
Evolution Two quickly and enjoy its basic functions.  
Evolution Two preamplifier channels may be operated independently, or they may  
be operated in linked mode, using CAN Link.  
Connecting the Evolution Two to Your System  
Position each power supply and preamplifier chassis where you intend to use  
connected channels. Do do not move the chassis after they are connected.  
1. Connect the power supply chassis and the preamplifier chassis with the 12-pin  
DC cable provided, using the DC power connectors (47) on the back panels  
(1-2).  
IMPORTANT  
Never connect two power supplies together.  
2. In order to operate the Evolution Two preamplifier in linked mode, connect the  
preamplifier channels together with the supplied RJ-45 control cable. In linked  
mode, functions including power, volume, balance, phase, record, mute, and  
input selections are instantaneously transmitted between linked preamplifier  
channels.  
When a system with linked preamplifier channels is powered on, left/right ori-  
entation is established immediately, with no user intervention. For more infor-  
mation on linked preamplifiers, see Appendix: CAN Link and Multiple  
Evolution Two Preamplifiers, on page 51.  
3. Neatly arrange and organize wiring to and from the Evolution Two preamplifier  
and all components. Separate AC wires from audio cables to prevent hum or  
other unwanted noise from being introduced into the system.  
4. Connect the outputs of your source equipment to the appropriate CAST (34),  
balanced (30), single-ended (31), or tape inputs (32, 33) on the Evolution Two.  
5. Connect the appropriate main outputs (35-41) on the Evolution Two to your  
amplifier.  
continued  
13  
 
(SECTION THREE: Quick Start)  
(Connecting the Evolution Two To Your System continued)  
6. On each preamplifier channel, connect the supplied AC power cord to the IEC  
power cord receptacle (48).  
7. On each preamplifier channel, plug the AC power cord into AC power. The  
front panel display (15) scrolls through EVOLUTION 2 SOFTWARE VERSION, and the  
red stand-by LEDs illuminate (4), indicating that the Evolution Two preamplifier  
is in stand-by mode. The scrolling stops when the Evolution Two is ready to be  
powered on.  
Note  
Use only the power cord provided with the preamplifier channel to make the connec-  
tion to AC power. Operation with a power cord other than the one supplied by Krell  
could induce noise, limit current, or otherwise impair the ability of the preamplifier chan-  
nel to perform optimally.  
Operating the Evolution Two (Linked Mode)  
After the Evolution Two is connected to your system and to AC power, and the  
front panel display (15) has stopped scrolling, begin operation:  
1. Press the power button on either preamplifier chassis front panel or the pwr  
key (3) on the remote control. The blue backlights illuminate, the red stand-by  
LEDs (4) turn off, and the front panel displays read INITIALIZING. The front panel  
displays show the factory default input: S-1, and level: -INF. The Evolution Two  
is now in the operational mode.  
2. With the Evolution Two preamplifier output muted or the volume fully attenuat-  
ed, select a source manually using the front panel input select buttons or the  
input select keys on the remote control (8, 9, 10, 11). Start playing the source.  
Use the level control knob or level keys (16) to set the volume to a comfortable  
listening level.  
3. To return the Evolution Two preamplifier to the stand-by mode, press the  
power button or pwr key.  
Krell recommends leaving the Evolution Two in the stand-by mode when it is  
not playing music.  
14  
 
SECTION  
FOUR  
Anatomy of an Evolution Two  
This section describes Evolution Two Monaural Preamplifier functions.  
Figure 1 Evolution Two Preamplifier Chassis and Power Supply Chassis Front Panels  
1
TAPE  
PHASE  
RECORD  
15  
POWER  
MENU  
ENTER  
MUTE  
3 4  
6
7
8
9
10 11 12 13 14 16  
17 18  
5
2
4
1 Preamplifier Chassis  
2 Power Supply Chassis  
3 Power Button  
Chassis  
Power  
4 Stand-by LED  
5 Power Backlight  
Remote  
6 IR Sensor  
Functions  
Preamplifier  
Functions  
7 Infrared Transmitter LED  
8 Single-ended Input  
Selection Buttons  
9 Balanced Input  
Selection Buttons  
10 CAST Input Selection Buttons  
11 Tape Button and LED  
12 Mute Button and LED  
13 Record Button and LED  
14 Phase Button and LED  
15 Front Panel Display  
16 Level Control Knob  
17 Menu Button  
Inset Evolution Two Preamplifier  
Channel: Front Panel View  
Display  
Level  
Navigate/  
Customize  
19  
20  
18 Enter Button  
19 Preamplifier Chassis Feet  
20 Power Supply Chassis Feet  
continued  
15  
 
(SECTION FOUR: Anatomy of an Evolution Two continued)  
Figure 2 Evolution Two Remote Control  
28  
3
29  
12  
14  
13  
21  
8
9
11  
18  
10  
22  
17  
25  
16  
23  
24  
27  
26  
3 Power Key  
8 Single-ended Input  
Selection Keys  
Power  
Preamplifier  
Functions  
9 Balanced Input  
Selection Keys  
10 CAST Input  
Selection Keys  
11 Tape Key  
12 Mute Key  
13 Record Key  
14 Phase Key  
21 Main Bus Key  
22 Balance Key  
16 Level Keys  
17 Menu Key  
18 Enter Key  
23 Pause Key  
24 Play Key  
Level  
Navigate/  
Customize  
CD  
Functions  
25 Stop Key  
26 Track Forward  
and Back Key  
27 Search Forward  
and Back Key  
Amplifier  
Functions  
28 Amplifier Power Key  
29 Meter Select Key  
16  
 
Front Panel Description  
See Figure 1 on page 15  
Each Evolution Two Monaural Preamplifier channel is comprised of two chas-  
sis, the preamplifier chassis and the power supply chassis. Front panel func-  
tions and their descriptions follow.  
Chassis  
1 Preamplifier Chassis  
The preamplifier chassis front panel provides power on, input and zone selec-  
tion, level control, menu functions, and status display.  
2 Power Supply Chassis  
Powerful transformers, high quality regulators, and extensive electrical and  
magnetic shielding are housed in a separate power supply for each preampli-  
fier channel.  
Power  
3 Power Button or Key  
Use this button or key to switch the Evolution Two between the stand-by and  
operational modes.  
4 Stand-by LED  
The red stand-by LEDs on the preamplifier and the power supply illuminate  
when the Evolution Two is plugged into a standard AC wall receptacle, indicat-  
ing that the Evolution Two is ready to be switched to the operational mode.  
The stand-by LEDs flash when remote control signals are received.  
5 Power Backlight  
The blue power backlight illuminates when the Evolution Two is in the opera-  
tional mode.  
Remote Functions on the Front Panel  
6 Infrared Sensor  
The infrared sensor receives commands from the Evolution Two remote con-  
trol. For proper remote control operation, make sure the infrared sensor is not  
covered or obstructed.  
7 Infrared Transmitter LED  
The stand-by LED (4) on the preamplifier chassis (1) flashes when the Evolution  
Two sends signals via the infrared transmitter LED to a programmable remote  
control, such as the Universal Krell Touch Screen Remote. See IR Out  
Control, on page 40.  
continued  
17  
 
(SECTION FOUR: Anatomy of an Evolution Two continued)  
Preamplifier Functions  
8, 9, 10 Input Select Buttons or Keys  
Use these buttons to select the corresponding rear panel input that is connect-  
ed to a CAST (C-1, C-2, C-3), balanced (B-1, B-2, B-3), or single-ended (S-1,  
S-2, S-3, S-4) analog source. The front panel display shows the selected input  
and volume level.  
There is no dedicated tape input connector on the Evolution Two. B-3 and S-4  
may be selected for tape input.  
11 Tape Button and LED, or Key  
Use this button or key to select the corresponding rear panel input that is con-  
nected to an analog tape source. Either B-3 or S-4 (32, 33) may be configured  
as a tape input. When you configure either input, the other input is available as  
a normal input. The red tape LED illuminates when the tape input is selected.  
The front panel display (15) shows: TAPE and the main volume level. To cus-  
tomize tape operation see Tape Input, on page 46.  
12 Mute Button and LED, or Key  
Use this button or key to mute the preamplifier channel output. To unmute,  
press the mute button again. The red mute LED illuminates when mute is  
selected. To customize mute operation see Mute, on page 42.  
13 Record Button and LED, or Key  
Use this button or key to select the desired input for the record bus. The red  
record LED illuminates, when record is selected. The front panel display (15)  
shows the selected record input and the main volume level. To return to the  
main input display, press the record button again. See Play and Record, on  
page 30.  
14 Phase Button and LED, or Key  
Use this button or key to invert the absolute polarity of the main output 180  
degrees. The red phase LED illuminates, when phase is selected.  
Display  
15 Front Panel Display  
The front panel display provides preamplifier channel status messages, includ-  
ing input and record bus status, tape output status, volume level, balance off-  
set, and menu selections.  
18  
 
Level Control  
16 Level Control Knob or Level Keys  
Use this knob or keys to increase or decrease system volume level or, with the  
balance key (22), to adjust balance. The level control knob or keys also select  
menu options that customize the Evolution Two. See Customizing the  
Evolution Two, on page 32.  
Navigate/Customize  
17 Menu Button or Key  
Use this button or key to access the menu functions of the Evolution Two. For  
more information, see Customizing the Evolution Two, on page 32.  
18 Enter Button or Key  
Use this button or key to configure the menu functions of the Evolution Two.  
For more information, see Customizing the Evolution Two, on page 32.  
continued  
19  
 
(SECTION FOUR: Anatomy of an Evolution Two continued)  
Remote Control Description  
See Figure 2 on page 16  
The Evolution Two Monaural Preamplifier remote provides all of the power, pream-  
plifier, level control, and navigate/customize functions outlined under Front Panel  
Description, pages 17-19. The remote control provides additional functions,  
including CD functions and menu configuration, accessed using only the remote  
control keys.  
Battery Installation and Removal  
The Evolution Two preamplifier remote control uses 2 AAA-size 1.5 Volt batteries.  
Batteries are included with the shipment. To install the batteries:  
1. Remove the remote control backplate, using the supplied T-10 Torx wrench.  
2. Install the batteries, following the battery position diagram on the plastic bat-  
tery receptacle.  
3. Replace and secure the backplate.  
Notes  
Replace batteries when remote control function becomes intermittent.  
Remove batteries if the remote control is not used for a long period of time. Battery leakage  
can damage the remote control.  
Preamplifier Functions  
21 Main Bus Key  
Use this key to select the input for the main bus output. The red main LED illu-  
minates, when this function is selected. For more information, see Play and  
Record, on page 30.  
Level Control  
22 Bal(ance Key)  
Use this key, along with level keys or the level control knob (16) on the pream-  
plifier chassis to balance left and right output levels. The front panel display  
(15) shows the left and right balance offset.  
20  
 
Compact Disc Functions  
The compact disc keys of the Evolution Two remote control are functional with all  
Krell compact disc players.  
23 Pause Key  
Use this key to temporarily suspend playing the current compact disc track.  
Press pause again or press the play key (24), to resume playing the track at the  
point pause was engaged.  
24 Play Key  
Use this key to begin compact disc playback.  
25 Stop Key  
Use this key to end compact disc playback.  
26 Track Forward and Back Keys  
Use these keys to select and begin playing the track that follows or precedes  
the current track.  
27 Search Forward and Back Keys  
Press and hold these keys to scroll forward or backward through the current  
track.  
Note  
For information on track programming functions, refer to the owner's reference of your  
Krell compact disc player.  
Amplifier Functions  
28 Amp Pwr Key  
Use this key to activate Krell amplifiers connected to your system.  
29 Sel (Meter Select) Key  
Use this key to select the meter range of the power meter scale on the front of  
a Krell Evolution One power amplifier. Please refer to the Evolution One  
Owner’s Reference, for more information.  
continued  
21  
 
(SECTION FOUR: Anatomy of an Evolution Two continued)  
Figure 3 Evolution Two Preamplifier Chassis and Power Supply Chassis Back Panels  
30  
34  
45  
42  
43  
1
LINK  
LINK  
IN  
EVOLUUTION TWO  
IN  
MAIN BUS  
RECORD BUS  
OUT OUT  
IN  
1
2
INPUTS  
TAPE OUTPUTS  
MAIN OUTPUTS  
POWER  
39 40  
41  
37 38  
47  
35 36  
33  
32  
31  
44  
2
EVOLUTION TWO  
50/60 Hz  
KRELL INDUSTRIES, INC.  
45 CONNAIR ROAD  
ORANGE, CT 06477-3650  
USA  
POWER  
ANALOG  
SUPPLY  
FUSE  
DIGITAL  
SUPPLY  
FUSE  
PHONO POWER  
MADE IN USA  
NO USER SERVICEABLE PARTS INSIDE  
46 47  
48  
Inputs  
30 Balanced Inputs: B-1, B-2, B-3  
31 Single-ended Inputs: S-1, S-2, S-3, S-4  
32 Balanced Tape Input: B-3  
33 Single-ended Tape Input: S-4  
34 CAST Inputs: C-1, C-2, C-3  
35 Main Bus Balanced Tape Output  
Outputs  
36 Main Bus Single-ended  
Tape Output  
37 Record Bus Balanced  
Tape Output  
38 Record Bus Single-ended  
Tape Output  
39 Balanced Main Output  
40 Single-ended Main Output  
41 CAST Outputs  
42 RC-5 Input  
Remote  
43 RC-232 Input  
44 12 VDC In/Out  
Link Control  
Phono  
Power  
45 CAN Link In/Out  
46 Phono Power Port  
47 DC Power Connector  
48 IEC Power Cord Receptacle  
22  
 
Back Panel Description  
See Figure 3 on page 22  
The Evolution Two Monaural Preamplifier back panel provides all input and output  
connections, remote control inputs and outputs, and the power connection. Back  
panel features and their descriptions follow.  
Left/Right Channel Orientation  
Evolution Two preamplifiers are assembled as left or right preamplifier channels.  
Preamplifier RCA connectors (31, 36, 38, 40) are color coded. Left preamplifier  
channels are assembled with white RCA connectors, and right preamplifier chan-  
nels are assembled with red RCA connectors.  
Inputs  
30 Balanced Inputs: B-1, B-2, B-3  
The Evolution Two is equipped with 3 balanced analog source inputs with XLR  
connectors.  
31 Single-ended Inputs: S-1, S-2, S-3. S-4  
The Evolution Two is equipped with 4 single-ended analog source inputs with  
RCA connectors.  
32, 33 Tape Inputs: B-3 and S-4  
The Evolution Two is equipped with one balanced and one single-ended input,  
for use with a tape source. Either input may be configured as the tape input,  
from the menu (17). When you select the tape input (11), the other input  
becomes a normal input, selectable using the front panel button or the remote  
control key (8, 9).  
34 C-1, C-2, and C-3 CAST Inputs  
The Evolution Two is equipped with 3 CAST inputs with 4-pin bayonet connec-  
tors, for use with Krell CAST-equipped input devices.  
Outputs  
35, 36 Main Bus Outputs  
The Evolution Two is equipped with one balanced main bus output with XLR  
connectors and one single-ended main bus output with RCA connectors. Use  
the main bus outputs to record the input signal playing on the main outputs.  
For more information, see Play and Record, on page 30.  
continued  
23  
 
(SECTION FOUR: Anatomy of an Evolution Two continued)  
(Outputs continued)  
37, 38 Record Bus Outputs  
The Evolution Two is equipped with one balanced record bus output with XLR  
connectors and one single-ended record bus output with RCA connectors. Use  
the record bus outputs to record a input signal other than the signal playing on  
the main outputs. For more information, see Play and Record, on page 30.  
39, 40 Main Outputs  
The Evolution Two is equipped with one balanced output with XLR connectors  
and one single-ended output with RCA connectors.  
41 CAST Outputs  
The Evolution Two is equipped with two CAST preamplifier outputs with 4-pin  
bayonet connectors, for use with Krell CAST-equipped amplifiers.  
Remote Connections on the Back Panel  
42 RC-5 In  
Each Evolution Two preamplifier chassis (1) has an RC-5 remote input. The  
RC-5 remote connector is used with a third party remote control system that  
provides RC-5 (IR) data with the carrier intact, via a wired connection. A stereo  
tip, ring, sleeve 1/8mini connector is used in the following configuration: Tip =  
RC-5 data, Ring = +5 V, Sleeve = GND.  
43 RS-232  
Each Evolution Two preamplifier chassis (1) has an RS-232 port that receives  
messages from a computer-based control system, providing integrated control  
of all preamplifier functions. The RS-232 input uses a 9-pin D-subminiature  
connector. See the Evolution Two developer's reference, entitled RS-232 Port:  
Sending Commands and Interpreting Data, for more information.  
44 12 VDC In/Out (12 V Trigger)  
Each Evolution Two preamplifier chassis (1) has 2 outputs that send and one  
input that receives 12 VDC power on/off (12 V trigger) signals to and from  
other Krell components and other devices that incorporate a 12 V trigger. This  
allows you to turn other components on or off, or to and from stand-by,  
through the remote control. When the Evolution Two is switched to operational  
mode and is connected to other components through the 12 V trigger, it sends  
a signal that will switch other components, allowing whole systems or parts of  
24  
 
systems to be easily coordinated. For more information on customizing the 12 V  
trigger, see Input Trigger, on page 39. Mono 1/8mini connectors are used in  
the following configuration: Tip = +12 V, Sleeve = GND.  
Notes  
When the Evolution Two is in the operational mode, the 12 V trigger provides 12 Volts  
of DC output. When the component is in the stand-by mode or off, the DC output is  
0 Volts.  
A minimum of 30 mA is required to operate the 12 V trigger.  
Consult the owner's reference of the components used in a custom installation to take  
full advantage of the remote capabilities of the Evolution Two.  
Link Control  
45 CAN Link  
Each Evolution Two preamplifier chassis (1) has 2 RJ-45 link connectors, con-  
nected in parallel. These are used to operate preamplifier channels in linked  
mode. For more information, see Connections Using CAN Link, on page 28,  
Operation Using CAN Link, on page 31, and Link Control, on page 41.  
Phono Stage Connector  
46 Phono Power Port  
Each power supply chassis (2) has a phono power port, for connecting the  
preamplifier to a Krell KPE phono stage. Only one phono power port needs to  
be connected to the KPE.  
Power  
47 DC Power Connector  
Each preamplifier channel is equipped with two DC power connectors that  
connect the preamplifier chassis and the power supply chassis, using the pro-  
vided 12-pin DC power cable.  
48 IEC Power Cord Receptacle  
The IEC power connector, located on the power supply chassis (2), is for use  
with the provided IEC standard 15 amp AC power cord.  
25  
 
SECTION  
FIVE  
Connecting the Evolution Two  
to Your System  
This section describes Evolution Two Monaural Preamplifier connections and intro-  
duces the CAN Link remote control option.  
Input and Output Connections  
Krell recommends using its proprietary Krell CAST system for unparalleled sonic  
performance for connections between the Evolution Two preamplifier and other  
CAST-equipped components. Krell CAST uses flexible interconnecting cables that  
can be drawn through tight spaces and concealed.  
The Evolution Two also offers balanced operation. The circuitry and connections  
associated with balanced operation not only can minimize sonic loss but also are  
immune to induced noise, especially for installations using long cables.  
XLR Pin Configuration  
Pin 1  
Pin 2  
Pin 3  
Ground  
O
Non-inverting (0 )  
O
Inverting (180 )  
Inputs and outputs are located on the Evolution Two back panels. Maintain the  
correct left/right orientation, when hooking up your system.  
Left/Right Channel Orientation  
Evolution Two preamplifiers are assembled as left or right channels. Preamplifier  
RCA connectors (31, 36, 38, 40) are color coded. Left preamplifier channels are  
assembled with white RCA connectors, and right preamplifier channels are  
assembled with red RCA connectors.  
Connection Steps  
Position each power supply and preamplifier chassis where you intend to use the  
connected channels. Do do not move the connected chassis after they are  
assembled.  
26  
 
The following steps describe how to connect an Evolution Two preamplifier to  
your system:  
1. Connect each power supply chassis and preamplifier chassis with the 12-pin  
DC cable provided, using the DC power connectors (47) on the back panels  
(1-2).  
IMPORTANT  
Never connect two power supplies together.  
2. In order to operate the Evolution Two preamplifier in linked mode, connect the  
preamplifier channels together with the supplied RJ-45 control cable. In linked  
mode, functions including power, volume, balance, phase, record, mute, and  
input selections are instantaneously transmitted between linked preamplifier  
channels.  
When a system with linked Evolution Two preamplifiers is powered on, left/right  
orientation is established immediately, with no user intervention. For more  
information on linked preamplifiers, see Appendix: CAN Link and Multiple  
Evolution Two Preamplifiers, on page 51.  
3. Neatly arrange and organize wiring to and from the Evolution Two preamplifier  
and all components. Separate AC wires from audio cables to prevent hum or  
other unwanted noise from being introduced into the system.  
4. Connect the outputs of your source equipment to the appropriate CAST (34),  
balanced (30), single-ended (31), or tape inputs (32, 33) on the Evolution Two.  
5. Connect the appropriate main outputs (35-41) on the Evolution Two to your  
amplifier.  
6. On each preamplifier channel, connect the supplied AC power cord to the IEC  
power cord receptacle (48).  
7. On each preamplifier channel, plug the AC power cord into AC power. The  
front panel display (15) scrolls through EVOLUTION 2 SOFTWARE VERSION, and the  
red stand-by LEDs illuminate (4), indicating that the Evolution Two preamplifier  
is in stand-by mode. The scrolling stops when the Evolution Two is ready to be  
powered on.  
Note  
Use only the power cord provided with the preamplifier channel to make the connec-  
tion to AC power. Operation with a power cord other than the one supplied by Krell  
could induce noise, limit current, or otherwise impair the ability of the preamplifier chan-  
nel to perform optimally.  
continued  
27  
 
(SECTION FIVE: Connecting the Evolution Two to Your System continued)  
Connections Using CAN Link  
The Evolution Two brings a new convenience to the operation of monaural pream-  
plifiers, using a sophisticated, reliable control system called a controller area net-  
work (CAN). Using CAN Link, any number of preamplifier channels may be linked  
for multichannel playback. CAN Link enables all linked preamplifier channels to be  
controlled from any single linked preamplifier channel in the system.  
To Connect Multiple Evolution Two  
Preamplifiers via CAN Link:  
After the power supply chassis is connected to the preamplifier chassis with the  
12-pin DC cable:  
1. Connect one RJ-45 connector from either CAN Link connector (45) on the  
back panel of any preamplifier chassis (1) to either CAN Link connector on any  
other preamplifier chassis. The two preamplifier channels that are connected  
are now linked.  
2. Repeat Step 1 for each additional preamplifier channel you want to link. For  
more information on linked preamplifier channels, see Appendix: CAN Link  
and Multiple Evolution Two Preamplifiers, on page 51.  
28  
 
SECTION  
SIX  
Evolution Two Operation  
The Evolution Two Monaural Preamplifer is easy to operate. Instructions follow for  
on/off and stand-by operation.  
IMPORTANT  
Always mute or fully attenuate the preamplifier level when switching sources.  
Do not change input connections to the amplifier when the amplifier is on.  
Use care when setting high playback levels. Always lower the volume level at the first  
sign of loudspeaker distress.  
On/Off and Stand-by Operation (Linked Mode)  
When powering on any system, turn on amplifiers last. When powering down, turn  
off amplifiers first.  
After the Evolution Two is connected to your system and to AC power, and the  
front panel display (15) has stopped scrolling, begin operation:  
1. Press the power button on either preamplifier chassis front panel or the pwr  
key (3) on the remote control. The blue backlights illuminates, the red stand-by  
LEDs (4) turn off, and the front panel displays read INITIALIZING. The front panel  
displays shows the factory default input: S-1, and level: -INF. The Evolution Two  
is now in the operational mode.  
2. With the Evolution Two preamplifier output muted or the volume fully attenuat-  
ed, select a source manually using the front panel input select buttons or the  
input select keys on the remote control (8, 9, 10, 11). Start playing the source.  
Use the level control knob or level keys (16) to set the volume to a comfortable  
listening level.  
3. To return the Evolution Two to the stand-by mode, press the power button or  
pwr key.  
Krell recommends leaving the Evolution Two in the stand-by mode when it is not  
playing music. Turn the Evolution Two off when the system is not being used for  
an extended period of time.  
continued  
29  
 
(SECTION SIX: Evolution Two Operation continued)  
To Turn Off Your System  
1. Place the amplifiers in the stand-by mode.  
2. Press the power button on the preamplifier chassis front panel or the pwr key  
(3) on the remote control to switch the Evolution Two to the stand-by mode.  
3. Turn off the amplifiers using the back panel power switch or by disconnecting  
them from AC power.  
4. Turn off the Evolution Two by unplugging the AC power cord from AC power.  
Play and Record  
The Evolution Two allows you to listen to one source through the main output (39  
or 44), while recording a different source through the record bus output (37 or 38).  
A main bus tape output (35, 36) is also available and allows for the connection of a  
second recording device.  
1. Press the power button (3) on the preamplifier chassis front panel (1) to switch  
the Evolution Two from stand-by to the operational mode.  
2. Press the input selection button on the preamplifier chassis front panel or the  
input selection keys (8, 9, 10, or 11) on the remote control to select the source  
that you want to listen to through the main outputs.  
3. Begin playing the source. Use the level control knob on preamplifier chassis  
front panel or the level keys (16) on the remote control to adjust the volume to  
the desired listening level.  
4. Press the record button on the preamplifier chassis front panel or the record  
key (13) on the remote control. The red record LED illuminates on the preampli-  
fier chassis front panel.  
5. Press the input selection button or keys to select the source that you want to  
record through the record bus output. This source can be different than the  
source selected for the main bus outputs, in Step 2.  
6. Press the record button or the main key (21) on the remote control, to return to  
the main bus output.  
30  
 
Operation Using CAN Link  
When a system with linked Evolution Two preamplifier channels is powered on,  
left/right orientation is established immediately, with no user intervention.  
1. The input selections and the power, volume, balance, phase, record, and mute  
adjustments you make on any preamplifier channel are instantly transmitted  
between all linked preamplifier channels.  
2. All configuration settings may be copied from any linked preamplifier channel  
to all other linked preamplifier channels using the clone feature. See Clone, on  
page 35.  
For more information on linked preamplifiers, see Appendix: CAN Link and  
Multiple Evolution Two Preamplifiers, on page 51.  
31  
 
SECTION  
SEVEN  
Customizing the Evolution Two  
The Evolution Two Monaural Preamplifier easy-to-use menu allows you to config-  
ure the following functions. You can also use the menu to review version informa-  
tion about the software, hardware, and firmware installed in the Evolution Two:  
AC Mains, page 33  
Backlight, page 33  
Balance, page 34  
Input Name, page 38  
Input Phase, page 39  
Input Trigger, page 39-40  
Recall, page 44  
RS-232 Control, page 44-5  
Save, page 45  
Channel Assign, pages 34-5 IR Out Control, page 40  
Software Clone, page 45-6  
Tape Input, page 46  
Theater Mode, page 47  
Volume Display, page 48  
Clone, page 35-6  
Link Control, page 41  
Mute, page 42  
Display, page 36-7  
Info, page 37  
Output Trigger, page 42-43  
RC-5 Control, page 43  
Input Level Trim, page 38  
Navigation Conventions  
Navigating the Evolution Two menu is straightforward and consistent throughout,  
using four functions and the menu option BACK.  
17 Menu Button or Key  
To enter the menu, press the menu button on the preamplifier chassis front panel  
or the menu key on the remote control. Once you are in the menu, you can press  
the menu button or key to exit the menu.  
16 Volume Knob or Level Keys  
Use the volume knob on the preamplifier chassis front panel or the up and down  
keys on the remote control to scroll forward and backward through the menu hier-  
archy. Each menu list is a continuous loop.  
18 Enter Button or Key  
Press the enter button on the preamplifier chassis front panel or the enter key on  
the remote control to select a function or a configuration option, and to confirm a  
selection. Only the enter button on the preamplifier chassis front panel may be  
used to initiate a clone.  
15 Front Panel Display  
The display shows the active function and configurable options.  
BACK  
Select back to scroll backwards up the menu hierarchy, or to exit a menu option  
without confirming it.  
The first list you see in the menu is the list of configurable functions. Select a con-  
figurable function to view a submenu: the list of options that configure the func-  
tion. You can configure some options as well, using a second submenu.  
32  
 
Menu Functions  
AC Mains  
This function enables you to operate the Evolution Two from a switched AC outlet.  
If AC Mains is set to ON, the preamplifier turns on immediately, by-passing stand-  
by. Thereafter, you may switch the preamplifier to and from stand-by, using the  
power button or pwr key (3). The options are: OFF, ON.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or up and  
down keys (16) on the remote control to select: AC MAINS.  
2. Press the enter button on the preamplifier chassis front panel or the enter key (18)  
on the remote control. The front panel display (15) shows the default mode: OFF.  
3. Use the level control knob or the up and down keys to select the desired  
option: OFF or ON.  
4. Press the enter button or key to confirm the selection. The front panel display  
reads: AC MAINS.  
OFF  
The Evolution Two switches to stand-by mode, when it detects AC power.  
ON  
The Evolution Two turns on immediately, bypassing the stand-by mode, when it  
detects AC power.  
Backlight  
This function enables you to control the blue power indicator brightness. The  
options are: OFF, LOW (25%), MED (50%), HIGH (100%).  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or up and  
down keys (16) on the remote control to select: BACKLIGHT.  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) reads: BRIGHTNESS.  
3. Press the enter button or the enter key again. The front panel display shows  
the default mode: HIGH.  
4. Use the level control knob or the up and down keys to select the desired  
brightness: OFF, LOW, MED, HIGH.  
5. Press the enter button or key to confirm the selection. The front panel display  
reads: BRIGHTNESS.  
continued  
33  
 
(SECTION SEVEN: Customizing the Evolution Two continued)  
Balance  
This function enables you to select the balance between the left and right chan-  
nels. The options are: CENTER, L .5-5 dB <, R .5-5 dB >.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or up and  
down keys (16) on the remote control to select: BALANCE.  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) shows the default  
mode: CENTER.  
3. Use the level control knob or the up and down keys to select the desired bal-  
ance option from 0 to +5 dB, in .5 dB increments, left or right.  
4. Press the enter button or key to confirm the selection. The front panel display  
reads: BALANCE.  
Balance is not active if a preamplifier channel is not linked. At least two linked pre-  
amplifier channels s are required for balance to activate. For more information on  
linked preamplifiers channels, see Appendix: CAN Link and Multiple Evolution  
Two Preamplifiers, on page 51.  
Channel Assign  
This function enables you to override the factory set channel assignments. The  
options are: FORCE LEFT, FORCE RIGHT, FORCE NONE, NO OVERRIDE.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or up and  
down keys (16) on the remote control to select: CHANNEL ASSIGN.  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) shows the default  
mode: NO OVERRIDE.  
17 Menu Button or Key  
Enter or exit the menu.  
16 Volume Knob  
or Level Keys  
3. Use the level control knob or the up and down keys to select the desired  
Navigate the menu hierarchy;  
review functions and configu-  
ration options.  
option: NO OVERRIDE, FORCE LEFT, FORCE RIGHT, or FORCE NONE.  
4. Press the enter button or key to confirm the selection. The front panel display  
18 Enter Button or Key  
Select a configuration option;  
confirm a selection.  
reads: CHANNEL ASSIGN.  
FORCE LEFT  
BACK  
Use to make a left channel respond as a right channel.  
Scroll backwards through the  
menu hierarchy; exit a menu  
option without confirming it.  
34  
 
FORCE RIGHT  
Use to make a right channel respond as a left channel.  
FORCE NONE  
The preamplifier channel ignores balance selections. Use this option to set up  
more than 2 preamplifier channels.  
NO OVERRIDE  
Return to CHANNEL ASSIGN. Serves the same function as BACK in all other menu  
items.  
For more information on linked preamplifiers, see Appendix: CAN Link and  
Multiple Evolution Two Preamplifiers, on page 51.  
Clone  
This function enables you to transfer configured functions between linked pream-  
plifier channels. There is no need to configure multiple menu choices for each pre-  
amplifier channel. Clone insures that, where desired, the configuration of functions  
for multiple preamplifier channels is identical. The option is: CLONE BEGIN.  
Enter the menu, then:  
1. Identify the clone transmitter and clone receiver. The clone transmitter is the  
preamplifier channel that transmits the clone and the clone receiver(s) is/are  
the preamplifier channel(s) that receive(s) the clone.  
2. Use the level control knob on the preamplifier chassis front panel (1) of the  
clone transmitter, or the up and down keys (16) on the remote control to select:  
CLONE.  
3. Press the enter button on the preamplifier chassis front panel (1) of the clone  
transmitter or the enter key (18) on the remote control. The front panel display  
(15) reads: CLONE BEGIN.  
4. Press the enter button or the enter key again. The clone transmitter display  
reads: CLONE TRANSMIT and the clone receiver display(s) read(s): CLONE RECEIVE.  
5. Press the enter button on the front panel of the clone transmitter. All clone  
receivers go into stand-by mode, indicating that the clone is accomplished.  
Note  
The enter button on the remote control cannot be used to activate the clone function.  
continued  
35  
 
(SECTION SEVEN: Customizing the Evolution Two continued)  
CLONE BEGIN  
Sends the message that a clone is about to begin, from the clone transmitter to  
the clone receiver(s).  
CLONE TRANSMIT  
Once the clone begin message is sent, the clone transmitter display reads: CLONE  
TRANSMIT, indicating that the preamplifier is ready to transmit the clone data.  
CLONE RECEIVE  
Once the clone begin message is sent, the clone receiver(s) display reads: CLONE  
RECEIVE, indicating that the preamplifier(s) is(are) ready to receive the clone data.  
Note  
In order to set a clone receiver to ignore the clone, use the level control knob on the clone  
receiver front panel to scroll to CLONE IGNORE.  
Display  
This function enables you to turn on the front panel display (15) all the time, or  
turn it off after a time out. The options are: ON, TIMED.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or the up and  
down keys on the remote control (16) to select: DISPLAY.  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) reads: MODE.  
3. Press the enter button or key (18) again. The front panel display shows the  
default mode: ON.  
4. Use the level control knob or the up and down keys to select the desired  
option: ON or TIMED.  
5. Press the enter button or key to confirm the selection. The front panel display  
17 Menu Button or Key  
reads: MODE.  
Enter or exit the menu.  
16 Volume Knob  
or Level Keys  
6. Use the level control knob or the up and down keys to select: BRIGHTNESS.  
7. Press the enter button or key. The front panel display shows the default mode:  
Navigate the menu hierarchy,  
review functions and configu-  
ration options.  
HIGH.  
8. Use the level control knob or the up and down keys to select the desired  
18 Enter Button or Key  
Select a configuration option  
or confirm a selection.  
brightness: OFF, LOW (25%), MED (50%), or HIGH (100%).  
9. Press the enter button or key to confirm the selection. The front panel display  
BACK  
Scroll up the menu hierarchy,  
or exit a menu option without  
confirming it.  
reads: BRIGHTNESS.  
36  
 
ON  
The front panel display is always on.  
TIMED  
The front panel display times out after 5 seconds.  
BRIGHTNESS  
Controls the brightness of the display. When the brightness setting is OFF, the  
display is at 50% of brightness when in menu mode, and turns completely off  
when you leave the menu mode.  
Info  
This function enables you to access information about the preamplifier software,  
EEPROM, and PC Boards. The PC Boards are listed in the left margin, on this  
page.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or up and  
PC Boards  
CAST IN 1  
CAST IN 2  
CAST IN 3  
CONNECT  
CONTROL  
DISPLAY  
down keys (16) on the remote control to select: INFO.  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) show the software ver-  
sion number.  
DISPLAY VERSION  
ENCODER  
FACEPLATE  
MAIN  
3. Rotate the level control knob clockwise or press the up key. The front panel  
display shows the EEPROM version number.  
4. Rotate the level control knob clockwise or press the up key again. The front  
OUT 1  
OUT 2  
panel display shows the PC board version number.  
REGULATOR  
TAPE OUT 1  
TAPE OUT 2  
VOLT IN  
5. Press the enter button or key. Use the level control knob or the up and down  
keys to scroll through the version numbers of PC boards, from the PC Boards  
listed at left.  
VOLUME  
EEPROM  
Electrically erasable programmable read-only memory. An erasable memory chip  
used in the Evolution Two to store menu selection information.  
continued  
37  
 
(SECTION SEVEN: Customizing the Evolution Two continued)  
Input Level Trim  
This function enables you to select an input offset for a particular input. The  
options are: +/-6 dB, in 1 dB increments.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or the up and  
down keys (16) on the remote control to select: INPUT LEVEL TRIM.  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) shows the default  
mode: B-1.  
3. Use the level control knob or the up and down keys to select the desired input:  
B-1, B-2, B-3, S-1, S-2, S-3, S-4, C-1, C-2, C-3, or TAPE.  
4. Press the enter button or key. The front panel display shows the default mode:  
0 dB.  
5. Use the level control knob or the up and down keys to select the desired trim  
option: +/-6 dB, in 1 dB increments.  
6. Press the enter button or key to confirm the selection. The front panel display  
shows the selected input.  
Input Name  
Input Name Options  
AUX, AUX1, AUX2, AUX3  
B-1, B-2, B-3, BYPC-1  
C-2, C-3, CABLE, CD, CD1,  
CD2, CD-R, COMP  
This function enables you to select an input name for each input. The input name  
options are listed in the left margin, on this page.  
Enter the menu, then:  
DAC, DAT, DCC, DISC, DISC 1,  
DISC 2, DISC 3, DSS, DVD,  
DVD1, DVD2, DVD3, DVD-A  
1. Use the level control knob on the preamplifier chassis front panel or up and  
down keys (16) on the remote control to select: INPUT NAME.  
EQ, GAME, HI-8  
LD, LD1, LD2, LINE 1, LINE 2,  
LINE 3, LINE  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) shows the default  
mode: B-1.  
MDISC, MIXER, MON  
PHONO, PHON1, PHON2,  
PROC  
3. Use the level control knob or the up and down keys to select the desired input:  
S-1, S-2, S-3, S-4, SACD, SAT,  
SRC1, SRC2, SRC3, SURR,  
S-VID  
B-1, B-2, B-3, S-1, S-2, S-3, S-4, C-1, C-2, C-3, or TAPE.  
TAPE1, TAPE2, TAPE3, TAPE,  
TEST, THR, TUNER, TUNR1,  
TUNR2, TV,  
4. Press the enter button or key. The front panel display shows no characters.  
5. Use the level control knob or the up and down keys to select the desired input  
VCR, VCR1, VCR2, VCR3,  
VDISC, VIDEO, VID1, VID2,  
VID3  
name, from the input name options listed at left.  
6. Press the enter button or key to confirm the selection and return to the input  
8MM, 8TRK  
list, in Step 3. The front panel display shows the input name.  
To select input names for other inputs, repeat Steps 3 and 4.  
38  
 
Input Phase  
This function enables you to invert the absolute polarity of the selected input 180  
degrees. The selections are: NORMAL, INVERT.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or the up and  
down keys (16) on the remote control to select: INPUT PHASE.  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) shows the default  
mode: B-1.  
3. Use the level control knob or the up and down keys to select the desired input  
from the list: B-1, B-2, B-3, S-1, S-2, S-3, S-4, C-1, C-2, C-3, or TAPE.  
4. Press the enter button or key. The front panel display shows the default mode:  
NORMAL.  
5. Use the level control knob or the up and down keys to select: NORMAL or INVERT.  
6. Press the enter button or key to confirm the selection. The front panel display  
shows the selected input.  
NORMAL  
The phase of the selected input is unaffected.  
INVERT  
The phase of the selected input is inverted 180 degrees.  
Input Trigger  
This function enables you to configure the input trigger. The options are: OFF,  
NORMAL, THEATER.  
Enter the menu, then:  
17 Menu Button or Key  
1. Use the level control knob on the preamplifier chassis front panel or the up and  
Enter or exit the menu.  
down keys on the remote control to select: INPUT TRIGGER.  
16 Volume Knob  
or Level Keys  
2. Press the enter button on the preamplifier chassis front panel or the or enter  
key (18) on the remote control. The front panel display (15) shows the default  
mode: NORMAL.  
Navigate the menu hierarchy,  
review functions and configu-  
ration options.  
18 Enter Button or Key  
Select a configuration option  
or confirm a selection.  
3. Use the level control knob or the up and down keys to select the desired  
option: OFF, NORMAL or THEATER.  
BACK  
4. Press the enter button or key to confirm the selection. The front panel display  
Scroll up the menu hierarchy,  
or exit a menu option without  
confirming it.  
reads: INPUT TRIGGER.  
continued  
39  
 
(SECTION SEVEN: Customizing the Evolution Two continued)  
(Input Trigger continued)  
OFF  
The Evolution Two does not respond to 12 V input trigger commands.  
NORMAL  
The Evolution Two responds to 12 V input trigger commands.  
THEATER  
The Evolution Two responds to 12 V input trigger commands, and the theater  
mode enabled input is selected automatically. See Theater Mode, on page 47.  
IR Out Control  
This function enables you to access Evolution Two IR commands and program a  
learning remote control.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or up and  
down keys (16) on the remote control to select: IR OUT.  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) shows the default  
mode: B-1 MAIN.  
3. Use the level control knob or the up and down keys to select the desired IR  
command from the list.  
4. Press the enter button or key to send the command out via the preamplifier  
front panel IR transmitter (7). The stand-by LED (4) on the preamplifier chassis  
flashes, indicating that the command has been sent.  
5. Repeat Steps 2-4 for each of the commands you wish to transmit.  
6. Press the enter button or key to confirm the selection. The front panel display  
reads: IR OUT.  
17 Menu Button or Key  
Enter or exit the menu.  
For a listing of IR codes, see the Evolution Two developer’s reference entitled  
RS-232 Port: Sending Commands and Interpreting Data. The right-terminated  
preamplifier is the link transmitter of IR data. For more information on linked pre-  
16 Volume Knob  
or Level Keys  
Navigate the menu hierarchy,  
review functions and configu-  
ration options.  
amplifier channels, see Appendix: CAN Link and Multiple Evolution Two  
Preamplifiers, on page 51.  
18 Enter Button or Key  
Select a configuration option  
or confirm a selection.  
BACK  
Scroll up the menu hierarchy,  
or exit a menu option without  
confirming it.  
40  
 
Link Control (CAN Link)  
This function enables you to link and unlink preamplifiers. The options are: LINKED,  
UNLINKED.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or the up and  
down keys (16) on the remote control to select: LINK CONTROL.  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) shows the default  
mode: LINKED.  
3. Use the level control knob or the up and down keys to select the desired  
option: LINKED, or UNLINKED.  
4. Press the enter button or key to confirm the selection. The front panel reads:  
LINKED.  
LINKED  
When preamplifier channels are linked, power, volume, balance, phase, record,  
mute, and input selections are automatically communicated between linked pre-  
amplifier channels. All other settings remain local and may be cloned from one  
preamplifier channel to another. See also Clone, on page 35, and Software  
Clone, on page 45.  
UNLINKED  
When a preamplifier channel is unlinked, it does not respond to commands from  
any other linked preamplifier channels. After the preamplifier channel is unlinked,  
settings can be changed, independent of other preamplifier channels.  
For more information on linked preamplifier channels, see Appendix: CAN Link  
and Multiple Evolution Two Preamplifiers, on page 51.  
continued  
41  
 
(SECTION SEVEN: Customizing the Evolution Two continued)  
Mute  
This function enables you to control the mute mode. The options are: FULL, -20 dB,  
BACK.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or up and  
down keys (16) on the remote control to select: MUTE.  
2. Press the enter button on the preamplifier chassis front panel or the or enter  
key (18) on the remote control. The front panel display (15) shows the default  
mode: FULL.  
3. Use the level control knob or the up and down keys to select the desired  
option: FULL or -20 dB.  
4. Press the enter button or key to confirm the selection. The front panel display  
reads: MUTE.  
FULL  
The output of the Evolution Two is completely silenced.  
-20dB  
The output of the Evolution Two is reduced by 20 dB and may still be audible.  
Output Trigger  
This function enables you to turn the two output triggers on or off, or configure  
them with independent delays of up to 20 seconds. The options are: ON, OFF, DELAY.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or up and  
down keys (16) on the remote control to select: OUTPUT TRIGGER.  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) shows the default  
mode: TRIGGER 1.  
17 Menu Button or Key  
Enter or exit the menu.  
16 Volume Knob  
or Level Keys  
3. Press the enter button or key again. The front panel display shows the default  
Navigate the menu hierarchy,  
review functions and configu-  
ration options.  
mode: OFF.  
4. Use the level control knob or up and down keys to select: OFF, ON, or DELAY.  
5. Select DELAY. You are prompted to enter a delay time of 0-20 seconds.  
6. Enter the delay time.  
18 Enter Button or Key  
Select a configuration option  
or confirm a selection.  
BACK  
Scroll up the menu hierarchy,  
or exit a menu option without  
confirming it.  
7. Press enter to confirm the selection. The front panel display reads: DELAY.  
42  
 
8. Use the level control knob or up and down keys to scroll to: BACK.  
9. Press the enter button or key to return to: TRIGGER 1.  
10. Use the level control knob or the up and down keys to scroll to: TRIGGER 2.  
11. Repeat Steps 3-7 to set Trigger 2.  
ON  
The 12 Volt trigger output is enabled at power on for the selected trigger (Trigger 1  
or 2).  
OFF  
The 12 Volt trigger output is disabled at power on for the selected trigger (Trigger  
1 or 2).  
DELAY  
The 12 volt trigger output is enabled at power on for the selected trigger (Trigger 1  
or 2), and the delayed for a period of time (0-20 seconds).  
RC-5 Control  
This function enables you to change the link transmit status of the Evolution Two.  
The options are: LINK TRANSMIT, LINK RECEIVE.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or up and  
down keys (16) on the remote control to select: RC-5 CONTROL.  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) shows the default  
mode: LINK TRANSMIT.  
3. Use the level control knob or the up and down keys to select the desired  
option: LINK TRANSMIT or LINK RECEIVE.  
4. Press the enter button or key to confirm the selection. The front panel display  
reads: RC-5 CONTROL.  
The right-terminated preamplifier channel is the link transmitter of RC-5 data.  
Connect the RC-5 cable to the RC-5 connector on the right-terminated preampli-  
fier channel. For more information on linked preamplifier channels, see Appendix:  
CAN Link and Multiple Evolution Two Preamplifiers, on page 51.  
continued  
43  
 
(SECTION SEVEN: Customizing the Evolution Two continued)  
Recall  
This function enables you to access factory default settings or your own saved  
settings, or to undo a clone. The options are: FACTORY, SAVED, CLONE UNDO.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier channel front panel or up and  
down keys (16) on the remote control to select: RECALL.  
2. Press the enter button on the preamplifier channel front panel or the or enter  
key (18) on the remote control. The front panel display (15) shows the default  
mode: FACTORY.  
3. Use the level control knob or the up and down keys to select the desired  
option: FACTORY, SAVED, or CLONE UNDO.  
4. Press the enter button or key to confirm the selection. The front panel display  
reads: RECALL.  
FACTORY  
Recalls the factory settings.  
SAVED  
Recalls settings previously stored in memory using the SAVE function. See also  
Save, on page 45.  
CLONE UNDO  
Cancels clone settings. All settings revert to the last settings in memory prior to  
cloning. See also Clone, on page 35.  
RS-232 Control  
This function enables you to change the link transmit status of the Evolution Two.  
The options are LINK TRANSMIT, LINK RECEIVE.  
Enter the menu, then:  
17 Menu Button or Key  
Enter or exit the menu.  
1. Use the level control knob on the preamplifier channel front panel or up and  
16 Volume Knob  
or Level Keys  
down keys (16) on the remote control to select: RS-232 CONTROL.  
Navigate the menu hierarchy,  
review functions and configu-  
ration options.  
2. Press the enter button on the preamplifier channel front panel or the enter key  
(18) on the remote control. The front panel display (15) shows the default  
mode: LINK TRANSMIT.  
18 Enter Button or Key  
Select a configuration option  
or confirm a selection.  
3. Use the level control knob or the up and down keys to select the desired  
BACK  
option: LINK TRANSMIT, or LINK RECEIVE.  
Scroll up the menu hierarchy,  
or exit a menu option without  
confirming it.  
44  
 
4. Press the enter button or key to confirm the selection. The front panel display  
reads: RS-232 CONTROL.  
The right-terminated preamplifier channel is the link transmitter of RS-232 data.  
Connect the RS-232 cable to the RS-232 connector on the right-terminated pre-  
amplifier channel. For more information on linked preamplifier channels, see  
Appendix: CAN Link and Multiple Evolution Two Preamplifiers, on page 51.  
Save  
This function enables you to save a copy of the current settings. The options are:  
GO, BACK.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier channel front panel or up and  
down keys (16) on the remote control to select: SAVE.  
2. Press the enter button on the preamplifier channel front panel or the or enter  
key (18) on the remote control. The front panel display (15) shows the default  
mode: GO.  
3. Press the enter button or key to save the settings The front panel display  
reads: SAVE.  
GO  
Saves a copy of current settings to memory, overwriting previously saved settings.  
Software Clone  
This function enables you to transfer operational software from one linked pream-  
plifier channel to another. Software clone insures that, where desired, software for  
multiple preamplifier channels is identical. The options are: NO, YES.  
Enter the menu, then:  
1. Identify the clone transmitter and clone receiver. The clone transmitter is the  
preamplifier channel that transmits the clone and the clone receiver(s) is/are  
the preamplifier channel(s) that receive(s) the clone.  
2. Use the level control knob on the preamplifier chassis front panel of the clone  
transmitter, or up and down keys (16) on the remote control to select: SOFTWARE  
CLONE.  
3. Press the enter button on the clone transmitter front panel or the enter key (18)  
on the remote control. The front panel display (15) reads: SW BEGIN.  
continued  
45  
 
(SECTION SEVEN: Customizing the Evolution Two continued)  
(Software Clone continued)  
4. Press the enter button or the enter key (18) again. The front panel display on  
the clone transmitter shows the default: ARE YOU SURE NO.  
5. Use the level control knob on the clone transmitter or the up and down keys to  
select: ARE YOU SURE YES.  
6. Press the enter button on the clone transmitter. The front panel display on the  
clone transmitter reads: SENDING UPDATE. The front panel display on the clone  
receiver(s) read(s): RECEIVING UPDATE. All linked preamplifier channels switch to  
stand-by mode, indicating that the software clone is accomplished.  
SW CLONE BEGIN  
Begins the software clone process.  
ARE YOU SURE  
Confirms the software clone. The options are: NO, YES  
NO  
Cancels the software clone. The front panel display returns to: SOFTWARE CLONE.  
YES  
Initiates the software clone.  
Tape Input  
This function enables you to select either S-4 or B-3 as the tape input. The input  
that is not selected operates as a normal input. The options are: B-3, S-4, NONE.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier channel front panel or up and  
down keys (16) on the remote control to select: TAPE INPUT.  
2. Press the enter button on the preamplifier channel front panel or the enter key  
(18) on the remote control. The front panel display (15) shows the default  
mode: S-4.  
17 Menu Button or Key  
Enter or exit the menu.  
16 Volume Knob  
or Level Keys  
3. Use the level control knob or the up and down keys to select the desired  
option: S-4 , B-3, NONE, or BACK.  
Navigate the menu hierarchy,  
review functions and configu-  
ration options.  
4. Press the enter button or key to confirm the selection. The front panel display  
reads: TAPE INPUT.  
18 Enter Button or Key  
Select a configuration option  
or confirm a selection.  
NONE  
When the tape input is set to NONE, both S-4 and B-3 act as normal inputs, not as  
tape inputs.  
BACK  
Scroll up the menu hierarchy,  
or exit a menu option without  
confirming it.  
46  
 
Theater Mode  
This function enables you to select theater mode volume for a particular input.  
Use this function when connecting the output of a preamp/processor to the  
Evolution Two for home theater applications. Configuring an input for theater  
mode sets that input for unity gain and suspends the level control of the Evolution  
Two. Volume adjustments are then made through the preamp/processor connect-  
ed to the input configured for theater mode on the Evolution Two. The options are:  
ON, OFF.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or the up and  
down keys (16) on the remote control to select THEATER.  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) shows the default input:  
B-1.  
3. Use the level control knob or the up and down keys to select the desired input:  
B-1, B-2, B-3, S-1, S-2, S-3, S-4, C-1, C-2, C-3, or TAPE.  
4. Press the enter button or key. The front panel display shows the default mode:  
OFF.  
5. Use the level control knob or the up or down keys to select ON or OFF.  
6. Press ENTER to confirm the selection and return to the selected input.  
ON  
The selected input is set to THEATER and the volume control for the theater input is  
disengaged on the Evolution Two.  
OFF  
The selected input is configured normally and the volume control for the normal  
input is engaged on the Evolution Two.  
Note  
Only one input on the Evolution Two can be in theater mode at a time. When theater mode  
is set for an input, theater mode is cleared automatically from other inputs.  
The Evolution Two selects the theater input automatically upon power on, if the input trig-  
ger is configured for THEATER. See Input Trigger, on pages 39-40.  
continued  
47  
 
(SECTION SEVEN: Customizing the Evolution Two continued)  
Volume Display  
This function enables you to select the numeric mode for the volume display, dis-  
playing values from softest to loudest: 0 to 151. Alternatively, you can select the  
dB mode for the volume display, displaying values from softest to loudest: -inf to  
+12 dB. The options are: NUMERIC, dB.  
Enter the menu, then:  
1. Use the level control knob on the preamplifier chassis front panel or up and  
down keys (16) on the remote control to select: VOLUME DISPLAY.  
2. Press the enter button on the preamplifier chassis front panel or the enter key  
(18) on the remote control. The front panel display (15) shows the default  
mode: dB.  
3. Use the level control knob or the up and down keys to select the desired  
option: NUMERIC or DB.  
4. Press the enter button or key to confirm the selection. The front panel display  
reads: VOLUME DISPLAY.  
17 Menu Button or Key  
Enter or exit the menu.  
16 Volume Knob  
or Level Keys  
Navigate the menu hierarchy,  
review functions and configu-  
ration options.  
18 Enter Button or Key  
Select a configuration option  
or confirm a selection.  
BACK  
Scroll up the menu hierarchy,  
or exit a menu option without  
confirming it.  
48  
 
SECTION  
EIGHT  
Questions and Answers  
Q. Why does the second preamplifier channel not respond when I select an input  
or adjust the volume on the other preamplifier channel?  
A. The two preamplifier channels must be linked together using the RJ-45 cable  
in order for functions to be sent between preamplifier channels.  
Q. I renamed the B-1 input on one of the preamplifier channels. Why does it still  
read B-1 on the other preamplifier channel?  
A. When two or more preamplifier channels are linked, basic functions such as  
volume and input selection are simultaneously executed by all linked preampli-  
fier channels. In order for linked preamplifier channels to recognize customized  
menu functions such as renaming inputs, the clone procedure must be per-  
formed. For more information, see Clone, on page 35, and Software Clone,  
on page 45.  
Q. When I adjust the balance, the sound moves to the side that is opposite my  
adjustment. What is wrong?  
A. The Evolution Two preamplifier is preset from the factory as either a left or a  
right preamplifier. Make sure the preamplifier chassis with the white connectors  
is used for the left channel and the preamplifier chassis with red connectors is  
used for the right channel.  
Q. What should I do if I see a DC ERROR message?  
A. The Evolution Two preamplifier has a sophisticated DC protection system that  
detects potentially harmful DC. Please contact Krell to determine what action  
to take, if you see a DC error message.  
Q. The Evolution Two preamplifiers are plugged into AC outlets and the link  
cables are connected, but the preamplifier channels do not power on. What  
should I do?  
A. The link cables only pass data between preamplifier channels. The power sup-  
ply chassis must be connected to the preamplifier chassis with the provided  
12-pin DC cable.  
continued  
49  
 
(SECTION EIGHT: Questions and Answers continued)  
Troubleshooting System Noise  
When you mix and match high-performance audio components, each with its own  
ground potential, a low frequency hum may occur in one or both loudspeakers.  
If this happens when you place the Evolution Two preamplifier into your system,  
follow these simple troubleshooting steps.  
1. Check that all input and output connections are of sound construction.  
2. With the preamplifier channel off, remove the interconnect cables, the turn the  
preamplifier channel on. If the hum disappears, turn the preamplifier channel  
off and reinsert one of the interconnect cables. Turn the preamplifier channel  
back on. Repeat this process for each cable.  
3. If the hum reappears with one or both interconnect cables reinserted, the cable  
needs to be replaced.  
4. If the interconnect cables are sound, you may be experiencing a ground loop.  
Please contact your authorized Krell dealer, distributor, or Krell for suggestions  
on how to eliminate the ground loop.  
50  
 
Appendix: CAN Link and Multiple  
Evolution Two Preamplifiers  
The Evolution Two Monaural Preamplifier brings a new convenience to the opera-  
tion of monaural preamplifiers, using a sophisticated, reliable control system called  
a controller area network (CAN). The CAN Link communication system enables all  
linked preamplifier channels to be controlled from any single linked preamplifier  
channel in the system. CAN Link logic distinguishes between left and right chan-  
nels. This distinction is of specific significance in the following situations:  
1. The connection of multiple preamplifier channels.  
2. The control of the Evolution Two using a third party remote control system via  
the infrared (IR) transmitter (7) and the RC-5 (42) and RS-232 (43) connectors.  
3. The use of the balance and channel assign functions, via the menu button or  
key (17).  
CAN Link logic is transparent during the normal operation of a stereo pair of linked  
Evolution Two preamplifiers.  
To Connect Multiple Evolution Two  
Preamplifiers via CAN Link:  
After the power supply chassis is connected to the preamplifier chassis with the  
12-pin DC cable:  
1. Connect one RJ-45 control cable from either CAN Link connector (45) on the  
back panel of any preamplifier chassis (1) to either CAN Link connector on any  
other preamplifier chassis. The two connected preamplifier channels are now  
linked.  
2. Repeat Step 1 for each additional preamplifiers you want to link.  
continued  
51  
 
(Appendix: CAN Link and Multiple Evolution Two Preamplifiers continued)  
Left/Right Channel Orientation  
Evolution Two preamplifiers are assembled as left or right channels. Preamplifier  
RCA connectors (31, 36, 38, 40) are color coded. Left preamplifier channels are  
assembled with white RCA connectors, and right preamplifier channels are  
assembled with red RCA connectors.  
Right-Terminated Preamplifier Channel  
Right preamplifier channels have a unique electrical identity under CAN Link.  
When a system with linked Evolution Two preamplifiers is powered on, the system  
automatically identifies the right-terminated preamplifier channel, and left/right ori-  
entation is established immediately, with no user intervention.  
Any right preamplifier channel that is last in a chain of linked Evolution Two pream-  
plifiers is referred to as right-terminated. There is only one RG-45 link cable con-  
nected to a right-terminated preamplifier channel.  
Example. The illustration below shows the preamplifier chassis back panels of  
three linked preamplifier channels. There are two right (R) channels and one left (L)  
channel. In this configuration, the top chassis belongs to a right-terminated pre-  
amplifier channel:  
right terminated  
R
R
one RG-45 link cable connected  
to the top chassis  
R
R
L
L
IR, RC5, and RS-232 Data Transfer from a Third Party Controller  
In a group of 2 or more preamplifier channels connected via CAN Link, the right-  
terminated channel is the transmitter of IR, RC-5, and RS-232 data to the other  
linked preamplifier(s), or receiver(s). Always make IR, RC-5, and RS-232 connec-  
tions from the third party controller to the right-terminated preamplifier channel.  
52  
 
Warranty  
Each Evolution Series preamplifier has a limited warranty of five years for parts and  
labor on circuitry. Should this product fail to perform at any time during the warran-  
ty, Krell will repair it at no cost to the owner, except as set forth in this warranty.  
This warranty does not apply to damage caused by acts of God or nature.  
The warranty described on this page shall be in lieu of any other warranty,  
expressed or implied, including, but not limited to, any implied warranty of mer-  
chantability or fitness for a particular purpose. There are no warranties which  
exceed beyond those described in this document. If this product does not perform  
as warranted herein, the owner’s sole remedy shall be repair. In no event will Krell  
be liable for incidental or consequential damages arising from purchase, use, or  
inability to use this product, even if Krell has been advised of the possibility of such  
damages.  
Proof of purchase in the form of a bill of sale or receipted invoice substantiating  
that the unit is within the warranty period must be presented to obtain warranty  
service. The warranty begins on the date of the original retail purchase, as noted on  
the bill of sale or receipted invoice from an authorized Krell dealer or distributor.  
Previously owned equipment, when re-purchased from an authorized Krell dealer or  
distributor, has the balance of the original warranty, based on the original date of  
manufacture.  
The warranty for Krell products is valid only in the country to which they were origi-  
nally shipped, through the authorized Krell distributor for that country, and at the  
factory. There may be restrictions on or changes to Krell’s warranty because of reg-  
ulations within a specific country. Please check with your distributor for a complete  
understanding of the warranty in your country.  
If a unit is serviced by a distributor who did not import the unit, there may be a  
charge for service, even if the product is within the warranty period.  
Freight to the factory is your responsibility. Return freight within the United States  
(U.S.A.) is included in the warranty. If you have purchased your Krell product out-  
side the U.S.A. and wish to have it serviced at the factory, all freight and associated  
charges to the factory are your responsibility.  
continued  
53  
 
(Warranty continued)  
Krell will pay return freight to the U.S.A.-based freight forwarder of your choice.  
Freight and other charges to ship the unit from the freight forwarder to you are also  
your responsibility.  
Krell is not responsible for any damage incurred in transit. Krell will file claims for  
damages as necessary for units damaged in transit to the factory. You are respon-  
sible for filing claims for shipping damages during the return shipment.  
Krell does not supply replacement parts and/or products to the owner of the unit.  
Replacement parts and/or products will be furnished only to the distributor per-  
forming service on this unit on an exchange basis only; any parts and/or products  
returned to Krell for exchange become the property of Krell.  
No expressed or implied warranty is made for any Krell product damaged by acci-  
dent, abuse, misuse, natural or personal disaster, or unauthorized modification.  
Any unauthorized voltage conversion, disassembly, component replacement,  
perforation of chassis, updates, or modifications performed to the unit will  
void the warranty.  
In the event that Krell receives a product for warranty service that has been modi-  
fied in any way without Krell authorization, all warranties on that product will be  
void. The product will be returned to original factory layout specifications at the  
owner’s expense before it is repaired. All repairs required after the product has  
been returned to original factory specifications will be charged to the customer, at  
current parts and labor rates.  
All operational features, functions, specifications, and policies are subject to  
change without notification.  
To register your product for warranty benefits, please complete and return  
the Warranty Registration Card enclosed in the shipping box within 15 days  
of purchase. Thank you.  
54  
 
Return Authorization Procedure  
If you believe there is a problem with your component, please contact your dealer,  
distributor, or the Krell factory to discuss the problem before you return the com-  
ponent for repair. To expedite service, you may wish to complete and e-mail the  
Service Request Form in the Service Section of our website at:  
To contact the Krell Service Department  
TEL  
203-799-9954, Monday-Friday  
9:00 AM to 5:00 PM EST  
203-795-2287  
FAX  
E-MAIL  
Evolution Two  
PRODUCT  
MODEL NUMBER  
SERIAL NUMBER  
To return a product to Krell, please follow this procedure so that we may  
serve you better.  
1. Obtain a Return Authorization Number (R/A number) and shipping address  
from the Krell Service Department.  
2. Insure and accept all liability for loss or damage to the product during ship  
ment to the Krell factory and ensure all freight (shipping) charges are prepaid.  
The product may also be hand delivered if arrangements with the Service  
Department have been made in advance. Proof of purchase will be required for  
warranty validation at the time of hand delivery.  
IMPORTANT  
Use the original packaging to ensure the safe transit of the product to the factory,  
dealer, or distributor. Krell may, at its discretion, return a product in new packaging  
and bill the owner for such packaging if the product received by Krell was boxed in  
nonstandard packaging or if the original packaging was so damaged that it was  
unusable. If Krell determines that new packaging is required, the owner will be noti-  
fied before the product is returned.  
To purchase additional packaging, please contact your authorized Krell dealer, dis-  
tributor, or the Krell Service Department for assistance.  
55  
 
Specifications  
Inputs  
Volume control  
Balanced, current-mode,  
16-bit, discrete R-2R ladder  
3 CAST via 4-pin bayonet connectors  
3 balanced via XLR connectors  
4 single-ended via RCA connectors  
Input overload  
Tape input  
CAST: 11 mA RMS  
Balanced: 9 V RMS  
Single-ended: 18 V RMS  
1 balanced via XLR connector or  
1 single-ended via RCA connector,  
user configurable  
Output overload  
Main outputs  
CAST: 22 mA RMS  
Balanced: 20 V RMS  
Single-ended: 10 V RMS  
2 CAST via 4-pin bayonet connectors  
1 balanced via XLR connector  
1 single-ended via RCA connector  
Frequency response  
Tape outputs  
20 Hz to 20 kHz 0.01 dB  
Balanced or single-ended inputs:  
0.2 Hz to 1.3 MHz +0, -3 dB  
CAST inputs:  
1 balanced via XLR connector and  
1 single-ended via RCA connector,  
buffered, connected to main input-  
selection bus  
0.2 Hz to 2 MHz +0, -3 dB  
1 balanced via XLR connector and  
1 single-ended via RCA connector,  
buffered, connected to a dedicated  
record-output bus  
Total harmonic distortion plus noise  
Balanced Output:  
<0.003%, 20 Hz to 20 kHz, 4 V RMS  
CAST output: 4 mA RMS  
Control inputs  
1 RS-232 input via a 9-pin D-subminiature  
connector  
1 remote IR detector input via  
a 3-conductor 3.5 mm connector  
1 12 VDC trigger input via 3.5 mm  
connector  
Signal-to-noise ratio  
4 V RMS balanced or 4 mA RMS CAST output  
Wideband, unweighted: >97 dB  
“A” weighted: >104 dB  
Power consumption  
Standby: 50 W  
Power on: 80 W  
1 preamplifier link via an RJ-45 connector  
Power on, with KPE: 90 W  
Control outputs  
Dimensions  
Preamplifier only:  
17.3 in.W x 3.7 in. H x 18.5 in. D  
43.8 cm W x 9.5 cm H x 47 cm D  
2 individually programmable 12 VDC  
trigger outputs via 3.5 mm connectors  
1 preamplifier link via an RJ-45 connector  
Power output  
1 phono power output ( 20 VDC) for KPE  
via a 9-pin D-subminiature connector  
Power supply only:  
17.3 in. W x 3.7 in. H x 17.3 in. D  
43.8 cm W x 9.5 cm H x 43.8 cm D  
Input impedance  
CAST: 35 Ohms  
Balanced: 40 k Ohms  
Single-ended: 20 k Ohms  
Preamplifier channel:  
17.3 in. W x 7.3 in. H x 18.5 in. D  
43.8 cm W x 18.5 cm H x 47 cm D  
Stereo pair:  
17.3 in. W x 14.6 in. H x 18.5 in. D  
43.8 cm W x 37.1 cm H x 47 cm D  
Output impedance  
CAST: >1 M Ohms  
Balanced: 250 Ohms  
Single-ended: 125 Ohms  
Weight  
Shipped: 69 lbs., 31.2 kg  
Preamplifier only: 21 lbs., 9.5 kg  
Power supply only: 31 lbs., 14 kg  
Gain  
12 dB (CAST or balanced output)  
6 dB (single-ended output)  
56  
 

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