Krell Industries Stereo Amplifier FBI User Manual

FBI  
Fully Balanced  
Integrated Amplifier  
Instructions for Use  
Owner’s Reference  
 
Contents  
Page  
INTRODUCTION  
5
REVOLUTIONARY KRELL CAST TECHNOLOGY  
DEFINITION OF TERMS  
UNPACKING  
6
8
10  
11  
PLACEMENT  
AC Power Guidelines  
FRONT PANEL / REMOTE CONTROL DESCRIPTION  
13  
15  
REMOTE CONTROL ONLY  
Battery Installation and Removal  
Remote Control Only Functions  
BACK PANEL DESCRIPTION  
18  
20  
CONNECTING THE FBI TO YOUR SYSTEM  
Connection Steps  
OPERATING YOUR FBI  
Amplifier Operation  
21  
23  
Tape Input and Output  
OPTIONAL CONFIGURATIONS  
Configuring the FBI for Theater Throughput  
Preamplifier Output  
HOW TO TROUBLESHOOT SYSTEM NOISE  
QUESTIONS AND ANSWERS  
WARRANTY  
25  
26  
27  
RETURN AUTHORIZATION PROCEDURE  
SPECIFICATIONS  
29  
Back Cover  
Krell FBI  
3
 
Illustrations  
Page  
FIGURE 1 The FBI Front Panel  
FIGURE 2 The FBI Remote Control  
FIGURE 3 The FBI Back Panel  
12  
12  
17  
4
Krell FBI  
 
Introduction  
Thank you for your purchase of the Krell FBI Remote Control Inte-  
grated Amplifier. This fully integrated amplifier and preamplifier has  
a fully balanced signal path from input to output and employs a  
wide bandwidth design with low negative feedback for sonic accu-  
racy throughout the frequency spectrum. All circuits, including the  
amplifier output stage, operate in pure Class A mode.  
The Fully Balanced Integrated Amplifier is a large-format integrat-  
ed, and as such offers all the power and control afforded by big  
Krell amplifiers in a convenient, integrated package that is simple  
to operate. The remote control accesses all functions, while a 12 V  
trigger connection allows the Fully Balanced Integrated Amplifier to  
interface easily with other components. The Theater Throughput  
feature provides easy integration into a home theater system.  
This owner’s reference manual contains important information on  
the placement, installation, and operation of the Fully Balanced  
Integrated Amplifier. Please read this information carefully. A thor-  
ough understanding of these details will help ensure satisfactory  
operation and long life for your Fully Balanced Integrated Amplifier  
and related system components.  
Krell FBI  
5
 
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 cir-  
cuitry 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 characteristics that act upon the musical signal independ-  
ently. Each component is unaware of the other components in the sys-  
tem. 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  
interconnects 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 musi-  
cal 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 eliminated. 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 be-  
tween components, its origin stems from Krell Current Mode, the tech-  
nology developed to transfer the musical signal within a component.  
CAST combined with Krell Current Mode takes circuitry signal trans-  
mission to the next evolutionary level. In essence, Krell Current Mode  
6
Krell FBI  
 
Revolutionary Krell CAST Technology, continued  
maintains the integrity of the signal within the component and 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 band-  
width increases up to an order of magnitude greater than their voltage  
based counterparts. This dramatic increase in circuit bandwidth deliv-  
ers near perfection in the audible band that typically suffers from phase  
distortions in voltage circuits.  
CAST Cable Construction  
A CAST system uses cables manufactured by Krell and other manu-  
facturers specially 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 developed for every  
CAST cable made.  
Evolution CAST  
By employing revolutionary current mirror circuitry, the Evolution 222  
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 improve-  
ments 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 compa-  
ny goal used for all Krell products. Krell strives for the delivery of the  
best performance of a musical event for you, using the full expression  
of technology to date.  
Krell FBI  
7
 
Definition of Terms  
Following are the definitions of key terms used in your owner’s  
reference manual.  
CONFIGURATIONS  
Theater Throughput  
Theater Throughput is a Krell configuration option that allows the  
signal from a surround preamp/processor to pass through a Krell  
preamplifier or integrated amplifier input at unity gain and sus-  
pends operation of the preamp volume control. When Theater  
Throughput is employed, control of the volume is accomplished  
through the home theater processor.  
INPUT AND OUTPUT  
CONNECTIONS  
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 professional and sound recording instal-  
lations, 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 technology 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 components to perform as if  
they are all part of a single circuit.  
Single-ended  
A two-wire input or output circuit. Use care when using single-  
ended connections as the ground connection is made last and  
broken first. Turn the system off prior to making or breaking sin-  
gle-ended connections. Single-ended connections are not recom-  
mended for connections requiring long cable runs.  
8
Krell FBI  
 
Definition of Terms, continued  
OPERATION  
Off  
The component is off when the AC power cord is unplugged from  
the wall receptacle.  
Stand-by Mode  
A low power consumption status that keeps the audio circuits at  
idle. When you plug the AC power cord into the wall receptacle,  
and turn on the rear panel breaker switch, the red stand-by LED  
illuminates. The component is now ready to be switched to the  
operational mode. Krell recommends leaving the component in  
the stand-by mode when it is not playing music.  
Operational Mode  
When the component is in the stand-by mode, and you press the  
power button on the front panel or the power key on the remote  
control, the blue power LED illuminates. The component is in the  
operational mode and is 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.  
See also Revolutionary Krell CAST Technology, on pages 6-7.  
Krell FBI  
9
 
Unpacking  
Two people are needed to remove the Fully Balanced Integrated  
amplifier from its shipping box safely and easily.  
1. Open the shipping carton and remove the top layer of foam.  
The carton contains :  
1 Fully Balanced Integrated Amplifier  
1 AC power cord  
1 12 VDC (12 V trigger) cable  
1 T-10 Torx wrench  
1 FBI remote control  
2 AAA 1.5 V batteries  
1 Packet containing the Quick Setup Guide and the warranty  
registration card  
2. Orient the shipping box so that one person stands at the front  
of the amplifier and one person stands at the back of the  
amplifier. Both people need to grab a pair of the cardboard  
handle cutouts (one pair located at the front of the amplifier  
and one pair located at the back of the amplifier) and simulta-  
neously lift the amplifier straight up, out of the carton. Bend  
and lift with your knees, not your back.  
3. Place the amplifier in a safe location and remove the protective  
plastic wrapping.  
Notes  
If any of the listed items are not included in the shipping box, please  
contact your authorized Krell dealer or distributor.  
Save all packing materials. If you need to ship your FBI in the future,  
repack the unit in its original packaging to prevent shipping damage. See  
Return Authorization Procedure, on page 29, for more information.  
10  
Krell FBI  
 
Placement  
Before you install the FBI into your system, please review the fol-  
lowing guidelines to choose the proper location for the FBI. This  
will facilitate a clean, trouble-free installation.  
The FBI does not require any type of special rack or cabinet for  
installation. For the dimensions of the FBI, see Specifications, on  
the back cover.  
Place the FBI on a firm, level surface, away from excessive heat,  
humidity, or moisture. The FBI requires at least two inches (5 cm)  
of clearance on each side and at least eight inches (20 cm) of  
clearance above and below the component to provide adequate  
ventilation. The ventilation grids on the FBI must be unobstructed.  
If the amplifier is placed in a closed cabinet, more than eight inch-  
es (20 cm) of clearance may need to be provided above and  
below the component, or small fans may be needed to increase  
ventilation. The air space between the chassis and shelf must be  
unobstructed.  
The Fully Balanced Integrated amplifier drives the lowest imped-  
ances with ease. When impedance is added due to long speaker  
cable lengths, amplifier power is wasted in the cable. Long speak-  
er cables reduce the maximum power that is delivered in the  
speakers.  
The Fully Balanced Integrated amplifier needs to be operated  
from a dedicated AC power line rated at a minimum of 20 amps.  
Use only the power cord provided with the Fully Balanced  
Integrated amplifier to make this connection. Operation with a  
power cord other than the one supplied by Krell can induce noise,  
limit current, and otherwise impair the amplifier’s ability to perform  
optimally. The use of the Fully Balanced Integrated amplifier with  
devices designed to alter or stabilize the AC power also may  
impair the amplifier’s ability to perform optimally.  
AC Power  
Guidelines  
Krell FBI  
11  
 
Figure 1 The FBI Front Panel  
12  
13  
4
Power  
1
2
3
4
Power Button or Key  
Power Indicator  
Stand-by LED  
Figure 2 The FBI Remote Control  
Infrared Sensor  
Note  
Analog Devices  
The numbered remote con-  
5
6
7
C-1 Button, Key  
and LED  
trol keys function with the  
FBI. The CD player keys on  
this remote control activate  
some Krell source compo-  
nents.  
B-1 Button, Key  
and LED  
S-1, S-2, S-3, and  
B-1, Buttons, Keys  
and LEDs  
8
9
Tape Button or Key  
Tape LED  
Mode Indicators  
10 Mute Button or Key  
11 Mute LED  
Volume  
12 Level Knob or Keys  
Display  
13 Front Panel Display  
Volume Adjustment  
Functions (remote only)  
14 Bal (Balance) keys  
12  
Krell FBI  
 
Front Panel/ Remote Control Description  
See Figures 1 and 2 on page 12  
Power, analog input selections, and volume control accessed via  
the FBI front panel buttons or remote control keys are described  
below. The front panel display shows volume and balance levels,  
and Theater Throughput status. Most front panel functions also are  
activated via the keys on the remote. The volume adjustment func-  
tion, a special operational feature of the remote control only, is  
described on page 16:  
POWER  
1 Power Button or Key  
Use this button or key to switch the FBI between the stand-by  
and the operational modes.  
2 Power Indicator  
The blue power indicator illuminates when the FBI is in the opera-  
tional mode. The blue power indicator also flashes when any  
remote control key is pressed.  
3 Stand-by LED  
The amplifier is in the stand-by mode and ready to be switched to  
the operational mode, when the FBI is plugged into a standard  
AC wall receptacle, the back panel power breaker switch (24) is in  
the up position, and the red stand-by LED illuminates.  
4 Infrared Sensor  
The infrared sensor receives commands from the FBI remote con-  
trol. For proper remote control operation, make sure that nothing  
is obstructing the infrared sensor.  
ANALOG  
5 C-1 Button, Key, and LED  
SOURCE  
COMPONENTS  
Selects a CAST source component (C-1) via a CAST connector.  
When the button or key is selected, the red LED illuminates.  
6 B-1 Button, Key, and LED  
Selects a balanced analog source component via an XLR connec-  
tor. When the button or key is selected, the red LED illuminates.  
7 S-1, S-2, and S-3 Buttons, Keys, and LEDs  
Selects a single-ended analog source component via single-  
ended RCA connectors. When the button or key is selected, the  
red LED illuminates.  
Krell FBI  
13  
 
Front Panel Description, continued  
8 Tape Button or Key  
Use this button or key to playback pre-recorded tapes and com-  
pare the output signal of an analog tape recorder to an audio  
source. See Tape Input and Output, on page 22.  
9 Tape LED  
The red tape monitor LED illuminates when the tape monitor is  
activated. The LED does not illuminate when an audio source is  
activated.  
MODE INDICATORS  
10 Mute Button or Key  
Use this button or key to interrupt the signal of the input you have  
selected. To unmute, press the mute button or key again.  
11 Mute LED  
The red mute LED illuminates when you press the mute button or  
key.  
12 Level Knob / Level Keys  
VOLUME ADJUSTMENT  
FUNCTIONS  
The level knob on the front panel or the level keys on the remote  
control adjust the amplifier output level. The output level is indi-  
cated numerically on the front panel display (13), with a range  
from 0-151.  
13 Front Panel Display  
The front panel display shows volume and balance levels and  
Theater Throughput status.  
14  
Krell FBI  
 
Remote Control Only  
See Figure 2 on page 12  
The remote control uses 2 AAA-size 1.5 Volt batteries. Batteries are  
Battery  
Installation  
and  
included with the shipment. To install the batteries:  
1. Remove the remote control backplate, using the supplied T-10 Torx  
wrench.  
Removal  
2. Install the batteries, following the battery position diagram on the  
plastic battery 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.  
Krell FBI  
15  
 
Remote Control Functions, continued  
The FBI remote control accesses complete power amplifier and  
preamplifier functions. The volume adjustment function is unique  
to the FBI remote control.  
Remote Control  
Only Functions  
VOLUME ADJUSTMENT  
FUNCTION  
14 Bal (Balance) Keys  
Use these keys to shift the balance to the left or the right channel.  
Balance level is indicated in the front panel display (13). To display  
balance, push any key on the remote.  
The front panel display indicates:  
-C-  
when the system is balanced. If the system is not balanced, the  
front panel display indicates that the balance is right or left of  
center and by how much, on a scale of 1 (least out of balance) to  
5 (most out of balance).  
Example: A display of:  
- - 3  
means that the balance is moderately right of center. A display  
of:  
5 - -  
means the balance is severely left of center.  
Note  
The numbered remote control keys function with the FBI. The CD player  
keys on this remote control activate some Krell source components.  
16  
Krell FBI  
 
Figure 3 The FBI Back Panel  
Amplifier Channel Outputs  
15 Left and Right  
Remote Back Panel Connections  
22 RC-5 In  
Loudspeaker Outputs  
23 12 VDC In/Out  
(12 V Trigger)  
Analog Inputs  
16 Left and Right  
CAST Inputs  
Power  
24 Back Panel Power  
Breaker Switch  
17 Left and Right Balanced  
Analog Inputs  
25 IEC Connector  
18 Left and Right Single-  
ended Analog Inputs  
Convenient Lifting Device  
26 Handles  
19 Left and Right Tape Inputs  
Analog Outputs  
20 Left and Right Tape  
Outputs  
21 Left and Right  
Preamplifier Outputs  
Krell FBI  
17  
 
Back Panel Description  
See Figure 3 on page 17  
The FBI back panel provides connections for all inputs and out-  
puts, power on/off, and additional remote connections.  
AMPLIFIER CHANNEL  
OUTPUTS  
15 Left and Right Loudspeaker Outputs  
Two pairs of loudspeaker binding posts are available for each  
channel of amplification, facilitating a power-bi-wire connection to  
the loudspeaker. Each pair of binding posts is connected internal-  
ly via copper buss bars. When only one set of binding posts is  
used, the connection can be made from either pair of binding  
posts. See the loudspeaker and/or cable manufacture’s instruc-  
tion manual for more information about power-bi-wire connec-  
tions.  
The loudspeaker binding posts accept spade lugs only. Bare wire,  
banana lugs, or pins will not work. Use the red terminal for the  
positive connection and the blue terminal for the negative con-  
nection.  
16 Krell CAST Inputs  
ANALOG INPUTS  
The FBI is equipped with one pair of Krell CAST inputs via 4-pin  
bayonet connectors. Krell CAST inputs allow the Fully Balanced  
Integrated amplifier to be connected to any Krell CAST-equipped  
component.  
17 Left and Right Balanced Analog Inputs  
The FBI is equipped with one pair of balanced (B-1) inputs via  
XLR connectors.  
18 Left and Right Single-Ended Analog Inputs  
The FBI is equipped with three pairs of single-ended (S-1,  
S-2, or S-3) inputs via RCA connectors.  
19 Left and Right Tape Inputs  
The FBI is equipped with a pair of single-ended tape inputs via  
RCA connectors.  
ANALOG OUTPUTS  
20 Left and Right Tape Outputs  
The FBI is equipped with a pair of single-ended tape  
outputs via RCA connectors.  
21 Left and Right Preamp Outputs  
The FBI is equipped with a pair of single-ended pre-  
amplifier outputs.  
18  
Krell FBI  
 
REMOTE  
22 RC-5 In  
CONNECTIONS  
The FBI is equipped with an RC-5 input that makes custom instal-  
lation easy and secure by accepting baseband RC-5 input com-  
mands from hardwired remote controllers.  
23 12 VDC In/ Out (12 V Trigger)  
The FBI has one output that sends, 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. When an  
amplifier 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 systems to be  
easily coordinated. Mono 3.5 mm connectors are used in the following  
configuration: Tip = +12 V, Sleeve = GND.  
When the FBI is in the operational mode, the 12 V trigger provides 12 Volts  
of DC output. When the FBI is in the stand-by mode or off, the DC output  
is 0 Volts. A maximum of 30 mA is available from the 12 V trigger output.  
Notes  
Consult the owner's reference of the components used in a custom instal-  
lation to take full advantage of the remote capabilities of the FBI.  
24 Back Panel Power Breaker Switch  
POWER  
Place the back panel power breaker switch in the up position to  
put the FBI in stand-by mode. Krell recommends that the amplifier  
remain on, in stand-by mode, when not in use.  
25 IEC Connector  
The connector is for use with the provided AC power cord.  
26 Handles  
CONVENIENT  
LIFTING DEVICE  
The FBI is equipped with two handles to help to move the inte-  
grated amplifier easily and safely.  
Krell FBI  
19  
 
Connecting the FBI  
to Your System  
USING BALANCED  
CONNECTIONS  
Krell recommends using balanced interconnect cables. Balanced  
interconnect cables not only can minimize sonic loss but are also  
immune to induced noise, especially with installations using long  
cables. Balanced connections have 6 dB more gain than single-  
ended connections. When level matching is critical, keep this gain  
value in mind.  
Follow these steps to connect the FBI to your system.  
Connection  
Steps  
1. Make sure all power sources and components are off before  
connecting inputs and outputs.  
2. Neatly organize the wiring between the FBI and all system  
components. Separate AC wires from audio cables to  
prevent hum or other unwanted noises from being introduced  
into the system.  
3. Connect the left and right outputs of your source components  
to the appropriate analog inputs (15, 16, 17) on the FBI. The  
FBI is equipped with one CAST input (C-1) (16), one balanced  
input (B-1) (17), three single-ended inputs (S-1, S-2, or S-3)  
(18), and one tape input (19). The C-1, B-1, S-1, S-2, and S-3  
inputs can be configured for Theater Throughput. See  
Optional Configurations, on page 23 for information on con-  
figuring an input for Theater Throughput.  
Pin 1 Shield (ground)  
Pin assignments for the  
XLR connectors  
Pin 2 Non-inverting (hot) (0°)  
Pin 3 Inverting (cold) (180°)  
4. Connect the loudspeaker cables to the loudspeaker binding  
posts (15) of the FBI, located on the back panel. Loudspeaker  
binding posts accept spade lugs only.  
6. Plug the AC power cord into the IEC connector (25) on the  
back panel of the FBI. Plug the other end of the power cord  
into the AC wall receptacle.  
20  
Krell FBI  
 
Operating Your FBI  
This section provides information about operating the Fully  
Balanced Integrated amplifier. The FBI provides basic input selec-  
tion and volume control operation from the front panel. The  
remote control includes additional preamplifier and volume func-  
tions as well as compact disc transport and amplifier controls.  
See Remote Control Functions, on page 16, for more informa-  
tion.  
Amplifier  
Operation  
The FBI is easy to operate. However, great care should be exer-  
cised when operating a system that includes the FBI, because of  
the amplifier’s power output. Switching between active sources  
without muting the preamplifier output, or bumping/miscuing a  
device, can generate large transients at low frequencies. The FBI  
may generate enough power with these transients to damage  
most loudspeakers. To avoid damage, be sure to switch all  
sources with the preamplifier level either muted or fully attenuat-  
ed. Do not change inputs to the amplifier while it is on.  
Note  
Krell amplifiers have large reserves of clean power and can safely drive  
loudspeakers to higher sound pressure levels than other amplifiers.  
However, use care when setting high playback levels and lower the vol-  
ume level at any sign of loudspeaker distress.  
ON/OFF AND  
STAND-BY OPERATION  
When powering up any system, always turn amplifiers on last.  
When powering down, always turn amplifiers off first.  
1. After the FBI is connected to AC power, place the back panel  
power breaker switch in the up position. The red stand-by  
LED (3) on the front panel is illuminated.  
2. When the amplifier is in stand-by mode, turn the FBI on by  
pressing the power button on the front panel or the power key  
on the remote control (1). There is a short wait period, while  
the amplifier power stages are started. The front panel display  
counts down the wait period and shows 000 (zero volume)  
The blue power LED (2) illuminates, and the red stand-by LED  
(3) turns off. The FBI is now in the operational mode.  
3. With the amplifier in the mute position, or the volume control  
fully attenuated, select a source from the front panel or the  
remote control (5, 6, or 7).  
4. Start playing the source.  
Krell FBI  
21  
 
Operating Your FBI, continued  
ON/OFF AND STAND-BY  
OPERATION, continued  
5. Set the volume to a comfortable listening level using the level  
knob on the front panel or the level keys on the remote control  
(12).  
6. To turn the FBI off, press the power button on the front panel  
or the power key on the remote control (1). The red stand-by  
LED (3) illuminates, and the FBI is in the stand-by mode.  
It is now safe to turn off the rest of the system.  
The FBI has a discrete tape input and output. The tape output is  
used to send an input signal from C-1, B-1, S-1, S-2, or S-3 to a  
recording device or processor. You can use the tape feature in  
three ways:  
Tape Input and  
Output  
1. Use the tape button on the front panel or the tape key on the  
remote (6) to playback pre-recorded tapes.  
2. Use the tape input to compare the output signal of a three-  
head analog tape recorder to the output signal of an audio  
source, when making a recording. To activate this function,  
select an audio source for recording using the C-1, B-1, S-1,  
S-2, or S-3 analog input buttons or keys (5). Press the tape  
button on the front panel or tape key on the remote on the to  
switch between the tape recorder output (red tape monitor  
LED [7] illuminated) and the input source (red tape monitor  
LED not illuminated).  
3. Use the tape output to create a processor loop, when the FBI  
is connected to a graphic equalizer or other ancillary equip-  
ment. To activate this function, connect the equipment to the  
FBI tape outputs (18) as described in the equipment manufac-  
turer’s manual. Press the tape button on the front panel or  
tape key on the remote to switch between the processor out-  
put (red tape monitor LED [7] illuminated) and the input source  
(red tape monitor LED not illuminated).  
Note  
When changing sources, lower the volume to off or mute the output.  
This ensures that the next source played does not damage your system  
with a high output transient.  
22  
Krell FBI  
 
Optional Configurations  
To simplify the integration of an audio/video surround sound proces-  
Configuring  
the FBI  
for Theater  
Throughput  
sor into your system, set any input on the FBI (C-1, B-1,S-1, S-2, or  
S-3) to operate as a unity gain stage. Krell calls this configuration  
Theater Throughput.  
When you configure a FBI input for Theater Throughput, the FBI  
volume and balance controls are transferred to the audio/video  
surround sound processor, for integrated volume and balance  
management as well as ease of operation. As long as the FBI  
input is configured for Theater Throughput and connected to the  
audio/video surround sound processor’s input configured for  
Theater Throughput, all FBI volume and balance adjustments are  
made through the surround sound processor. When you disen-  
gage the FBI input from Theater Throughput, the volume and bal-  
ance controls revert to the FBI.  
1. Turn on the FBI power.  
HOW TO ACTIVATE  
AN INPUT FOR  
THEATER  
2. Press and release the button on the front panel or the key on  
the remote for the device you wish to configure for Theater  
Throughput. The LED illuminates.  
THROUGHPUT  
3. Press the button or key again and hold it for 4 seconds. The  
front panel display (13) shows “thr.”  
IMPORTANT  
Make sure the level on the source component is set to zero when  
configuring the FBI input set for Theater Throughput. Source com-  
ponents without level controls should not be connected to an input  
configured for Theater Throughput. Doing so can result in excessive  
and possibly damaging volume levels when the source is played.  
Always turn off the source component before you configure any  
input on the FBI for Theater Throughput.  
When you disengage the Fully Balanced Integrated amplifier input  
from Theater Throughput, the volume and balance controls revert  
to the Fully Balanced Integrated amplifier.  
HOW TO DISENGAGE  
AN INPUT FOR  
THEATER  
THROUGHPUT  
1. Turn on the FBI power.  
2. Press and release the button on the front panel or the key on  
the remote for the device you wish to disengage from Theater  
Throughput. The LED illuminates.  
3. Press the button or key again and hold it for 4 seconds. The  
phrase "thr" disappears from the front panel display (13), indi-  
cating that Theater Throughput is disengaged.  
Krell FBI  
23  
 
Optional Configurations, continued  
The FBI is equipped with a pair of single-ended preamplifier out-  
puts (19). These outputs enable the FBI to be used as a preampli-  
fier when it is connected to a separate amplifier.  
Preamplifier  
Outputs  
Note  
The amplifier channel outputs are always active, even when the FBI is  
being used only as a preamplifier.  
24  
Krell FBI  
 
How to Troubleshoot System Noise  
AC grounding becomes critical when connecting high perform-  
ance audio components. When you mix and match audio compo-  
nents, each with its own ground potential, a low frequency hum  
may occur in one or both loudspeakers. This sometimes occurs  
when introducing a new component into a system.  
If a low frequency hum emanates from the loudspeakers when  
you place the FBI amplifier into the system, follow these simple  
troubleshooting steps:  
1. Check all cable terminations, making sure they have solid sol-  
der joints and are of sound construction.  
2. With the amplifier off, remove the interconnect cables, then  
turn the amplifier on. If the hum disappears, turn the amplifier  
off and reinsert one of the interconnect cables. Turn the  
amplifier back on. If the hum reappears with one or both  
cables reinserted, there may be a defective cable. Have the  
interconnect cables checked before proceeding.  
3. 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 solve this  
problem.  
Krell FBI  
25  
 
Questions and Answers  
Q. Should I leave my FBI on at all times?  
A. Krell recommends leaving the amplifier in the stand-by mode,  
ready to play music. If you are not going to play music for a  
long time, you may disconnect the amplifier from AC power  
supply.  
Q. When I turn on the amplifier there is a loud hum through the  
loudspeakers. What should I do?  
A. When a new component is introduced into a system, a low  
frequency hum may occur in one or both loudspeakers. Check  
all input and output connections, making sure they are of  
sound construction. See How to Troubleshoot System  
Noise, on page 25. If the interconnects and cables are sound,  
you may be experiencing a ground loop. This can often be  
easily eliminated. Please contact your authorized Krell dealer,  
distributor, or Krell for suggestions on how to solve this  
problem.  
Q. When I use the FBI’s Theater Throughput capability with my  
surround sound processor, where should I set the  
volume on the FBI?  
A. You do not need to set the volume on the FBI because the  
amplifier’s volume and balance controls are not active in the  
Theater Throughput mode. When using the FBI’s Theater  
Throughput capability, the surround sound processor controls  
the system volume. See Optional Configurations, on page  
23.  
26  
Krell FBI  
 
Warranty  
To register your product for  
warranty benefits, please  
complete and return the  
Warranty Registration Card  
enclosed in the shipping  
box within 15 days of  
Krell products have a limited warranty. Amplifiers, preamplifiers, preamp/  
processors, and receivers carry a limited warranty of five years for parts  
and labor on circuitry. Loudspeakers carry a limited warranty of five  
years for parts and labor. CD and DVD players carry a limited warranty  
of five years for parts and labor on circuitry, and three years for parts  
and labor on mechanical parts.  
purchase. Thank you.  
Should the product fail to perform at any time during the warranty, 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.  
This warranty 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 the 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 the 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 sub-  
stantiating that the product is within the warranty period must be pre-  
sented 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 dis-  
tributor, has the balance of the original warranty, based on the original  
date of manufacture.  
The warranty for a Krell product is valid only in the country to which it  
was originally 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 regulations within a specific country. Please  
check with your distributor for a complete understanding of the warran-  
ty in your country.  
If the product 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 war-  
ranty period.  
Krell FBI  
27  
 
Warranty, continued  
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 outside the U.S.A. and wish to have it serviced at the  
factory, all freight and associated charges to the factory are your  
responsibility. Krell will pay return freight to the U.S.A.-based freight for-  
warder of your choice. Freight and other charges to ship the product  
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 a product damaged in transit to  
the factory. You are responsible for filing claims for shipping damages  
during the return shipment.  
Krell does not supply replacement parts and/or products to the owner  
of the product. Replacement parts and/or products will be furnished  
only to the distributor performing service on this product 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 dam-  
aged by accident, abuse, misuse, natural or personal disaster, or unau-  
thorized modification.  
Any unauthorized voltage conversion, disassembly, component  
replacement, perforation of chassis, updates, or modifications per-  
formed to the product will void the warranty.  
The operating voltage of the product is determined by the factory and  
can only be changed by an authorized Krell distributor or at the factory.  
The voltage for this product in the U.S.A. cannot be changed until six  
months from the original purchase date.  
In the event that Krell receives a product for warranty service that has  
been modified 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, and specifications and policies are  
subject to change without notification.  
28  
Krell FBI  
 
Return Authorization  
Procedure  
If you believe there is a problem with your component, please  
HOW TO EXPEDITE  
SERVICE  
contact your dealer, distributor, or the Krell factory to discuss the  
problem before you return the component 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  
203-298-4020  
Monday-Friday, 9:00 am to 5:00 pm EST  
203-795-2287  
FAX  
E-MAIL  
service@krellonline.com  
HOW TO RETURN  
A PRODUCT  
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 ship-  
ping address from the Krell Service Department.  
2. Insure and accept all liability for loss or damage to the prod-  
uct during shipment 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 pur-  
chase 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 pack-  
aging 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 notified before the product is returned.  
HOW TO PURCHASE  
ADDITIONAL PACKING  
To purchase additional packaging, please contact your authorized  
Krell dealer, distributor, or the Krell Service Department for assis-  
tance.  
Krell FBI  
29  
 
Krell Industries, Inc.  
FBI  
Remote Control  
Integrated Amplifier  
v 06.0  
45 Connair Road  
Orange, CT 06477-3650 USA  
TEL 203-298-4000, FAX 203-891-2028  
E-MAIL krell@krellonline.com  
Specifications  
All operational features, functions,  
FREQUENCY RESPONSE  
20 Hz–20 kHz  
OUTPUTS  
4 loudspeaker via 5-standard  
specifications, and policies are  
subject to change without  
notification.  
+0.0 -0.05 dB  
binding posts  
SIGNAL-TO-NOISE RATIO  
A” weighted  
1 pair single-ended preamp  
via RCA connectors  
-108 dB  
TAPE INPUT AND OUTPUT  
1 pair single-ended via RCA  
connectors  
TOTAL HARMONIC  
DISTORTION (THD)  
1 kHz <0.04%  
OUTPUT VOLTAGE  
Peak to peak 138 V  
20 kHz <0.3%  
GAIN  
36.4 dB  
OUTPUT POWER  
8 Ohms 300 W  
INPUT SENSITIVITY  
4 Ohms 600 W  
0.741 V rms  
12 Ohms....1200 W  
INPUT IMPEDANCE  
REMOTE CONTROL  
210 kOhms  
1 handheld wireless IR remote  
POWER CONSUMPTION  
1 12 VDC Out/In (12 V trigger)  
Stand-by 70 W  
1 remove IR sensor input via 1/8” mini  
stereo connector  
Idle 185 W  
Max. 1,800 W  
1 RC-5 input via a DC power  
connector  
INPUTS  
All with Theater Throughput  
1 pair CAST via 4-pin bayonet  
connectors.  
DIMENSIONS  
17.3 in. W x 10.3 in. H x 20.5 in. D  
483 mm W x 260 mm H x 521 mm D  
1 pair balanced via XLR connectors  
WEIGHT  
3 pair single-ended via RCA  
connectors  
Shipped  
124 lb., 56.3 kg  
Unit only  
104 lb., 47.2 kg  
 

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