Krell Industries Stereo Amplifier KCT User Manual

KCT  
Krell Current Tunnel  
CAST Preamplifier  
THE LEADER IN AUDIO ENGINEERING  
Instructions for Use  
Owner’s Reference  
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Contents  
Page  
INTRODUCTION  
1
1
DEFINITION OF TERMS  
REVOLUTIONARY KRELL CAST TECHNOLOGY  
UNPACKING  
3
5
PLACEMENT  
5
AC Power Guidelines  
5
QUICK START  
6
FRONT PANEL DESCRIPTION  
BACK PANEL DESCRIPTION  
REMOTE CONTROL DESCRIPTION  
Battery Installation and Removal  
CONNECTING THE KCT PREAMPLIFIER TO YOUR SYSTEM  
Input and Output Connections  
KRELL LINK CONNECTIONS AND OPERATION  
TAPE INPUT AND OUTPUT  
OPERATING THE KCT PREAMPLIFIER  
On/Off and Stand-by Operation  
Main Zone and Zone 2 Operation  
TROUBLESHOOTING SYSTEM NOISE  
CUSTOMIZING THE KCT PREAMPLIFIER  
Z1 and Z2 Balance  
9
12  
15  
15  
18  
18  
19  
20  
21  
21  
22  
25  
26  
26  
26  
27  
27  
28  
29  
29  
29  
30  
Input Name Menu  
Input Level Trim  
Input Balance Trim  
Theater (Throughput) Mode  
Brightness  
Mute Menu  
Output Trigger Setup  
Tape Output Menu  
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Contents, continued  
AC Mains Menu  
Page  
30  
31  
31  
32  
32  
33  
33  
34  
35  
36  
37  
Program Remote Menu  
Input Trigger Setup  
Setup Memory  
Krell Link  
Trigger Delay Setup  
Exit Menu  
QUESTIONS AND ANSWERS  
WARRANTY  
RETURN AUTHORIZATION PROCEDURE  
SPECIFICATIONS  
List of Illustrations  
Figure 1 The KCT Front Panel  
Figure 2 The KCT Back Panel  
Figure 3 The KCT Remote Control  
8
11  
14  
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Introduction  
Thank you for your purchase of the Krell Current Tunnel (KCT) CAST Preamplifier. The  
KCT features Krell Current Tunnel topology and Krell CAST technology, which work  
together to reproduce music with unparalleled sound quality. The KCT has dual zone  
capability for listening to music from different input devices at the same time, or listening  
to one input device while recording another. Each zone has its own volume and balance  
control.  
Step-by-step menu options allow you to customize the KCT for ease of use and  
seamless integration into your system. Remote control features include a handheld  
remote control, which accesses all preamplifier functions as well as the compact disc  
functions on Krell compact disc players. The KCT also features Krell Link, RS-232 and  
12 VDC (12 Volt trigger) remote control inputs for a variety of system control options. A  
menu-driven program remote option allows you to send KCT operating commands to a  
learning or programmable remote control.  
A front panel display provides feedback on input and zone status, menu function and  
selection, and all preamplifier operations.  
This owner’s reference manual contains important information on the placement,  
installation, and operation of your KCT preamplifier. Please read this information  
carefully. A thorough understanding of these details will help ensure satisfactory  
operation and long life for your KCT and related system components.  
Definition of Terms  
Following are the definitions of key terms used in your owner’s reference manual.  
CONFIGURATIONS  
Krell Link  
A method of synchronizing remote control operation for Krell systems that include  
multiple preamplifiers, amplifiers, and associated components. When Krell Link in/out  
connections are used, the remote capabilities of the linked components are controlled  
from one component, called the control component. The linked components respond to  
stand-by and operational mode commands from the control component via MIDI cables.  
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 with no  
gain, for integrated volume and balance management of Krell home theater systems.  
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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 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.  
Krell Current Audio Signal Transmission (CAST)  
A proprietary Krell circuit technology for connecting analog components, in which the  
audio waveform is transmitted between components in the current rather than voltage  
domain. The speed and bandwidth provided by Krell CAST yields accurate, realistic  
music reproduction. Krell components connected via CAST 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 single-ended connections. Single-ended connections are not recommended  
for connections requiring long cable runs.  
OPERATION  
Off  
When the power button on the front panel is pressed and the blue power LED turns off,  
the component is off.  
Operational Mode  
When the power button on the front panel is pressed and the blue power LED  
illuminates, the component is in the operational mode and ready to play music.  
Stand-by Mode  
A low power consumption status that keeps the audio and regulator circuits at idle. Krell  
recommends leaving the component in the stand-by mode when it is not playing 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.  
Krell Sustained Plateau Bias II  
A proprietary Krell digital circuit that continually monitors the input signal and speaker  
impedance and adjusts the bias accordingly to ensure Class A operation. Sustained  
Plateau Bias II provides the enormous sonic benefits of continuous Class A operation  
while minimizing the heat generation and power consumption normally associated with  
Class A designs.  
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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.  
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 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: A New Approach  
CAST circuitry recognizes signal transmitted in the current domain instead of the  
voltage domain between each component. CAST transmission unifies individual  
components and their interconnects into an electrically linked whole. The sonic  
presentation of the entire system remains intact.  
CAST Basics  
Here’s 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, anomalies of signal transmission  
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 between components,  
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 CAST preserves  
the transmitted signal between components. Together, CAST and Krell Current Mode  
technologies unify separate Krell components into a single global circuit.  
CAST Cable Construction  
A CAST system uses cables manufactured by Krell and other manufacturers 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.  
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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 expression of  
technology to date.  
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Unpacking  
1. Open the box and remove the top layer of foam. You see these items:  
1 Krell Current Tunnel (KCT) CAST Preamplifier  
1 power cord  
1 12 VDC (12 Volt trigger) cable  
1 remote control  
2 batteries for remote control  
1 T-10 Torx wrench for remote control  
1 packet of information containing the Owner’s Reference and the Warranty  
Registration Card  
2. Carefully remove the unit and accessories from the box. Remove the foam end caps  
and protective plastic wrap from the unit.  
Notes  
If any of these items are not included, please contact your authorized Krell dealer,  
distributor, or Krell immediately for assistance.  
Save all packing materials. If you must ship your preamplifier in the future, repack the  
unit in its original packaging to prevent transit damage. See Return Authorization  
Procedure, on page 36.  
Placement  
Before you install the KCT preamplifier into your system, review the following guidelines  
to select the location for your component. This will facilitate a clean, trouble-free  
installation. The KCT does not require a special rack or cabinet for installation. See  
Specifications, on page 37, for the dimensions of the KCT.  
The KCT requires at least two inches (5 cm) of clearance on each side and at least two  
inches (5 cm) of clearance above the component to provide adequate ventilation.  
Installations inside cabinetry may need extra ventilation.  
AC POWER GUIDELINES  
The KCT has superb regulation and does not require a dedicated AC circuit. Avoid  
connections through extension cords or multiple AC adapters. High quality 15 amp  
grounded AC strips are acceptable. High quality AC line conditioners or filters can be  
used if they are grounded and meet or exceed the unit’s power supply rating of 100 VA.  
Krell Current Tunnel  
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Quick Start  
To access the full array of available features for the KCT preamplifier, please read the  
entire owner’s reference manual. The abbreviated procedures in this Quick Start section  
will allow you to connect and operate the KCT quickly and enjoy its basic features  
before you read the entire manual. Numbers in parentheses refer to Figure 1 on page 8,  
Figure 2 on page 11, and Figure 3 on page 14.  
Connecting the KCT Preamplifier  
1. Neatly organize the wiring between the KCT and all system components. Separate  
AC wires from audio cables to prevent hum or other unwanted noise from being  
introduced into the system.  
2. Connect the CAST cables from the left and right Krell CAST 4-pin inputs (20) on the  
KCT back panel to the CAST-equipped output of your source equipment. For  
balanced or single-ended operation, connect the interconnect cables from either the  
left and right balanced (17), single-ended (18) or tape (19) inputs to the balanced,  
single-ended, or tape output of your source equipment.  
Important  
Connecting non-CAST components to CAST inputs or outputs can damage your  
equipment and void your warranty. Do not attempt to alter CAST cable ends or CAST  
inputs or outputs. It is electrically impossible to convert CAST input/output chassis  
mount connectors for balanced or single-ended operation.  
Please read the Warranty, on page 35, to understand the warranty limitations of the  
KCT.  
3. Connect the CAST (23), balanced or single-ended (22) main zone outputs on the  
KCT back panel to your amplifier(s).  
4. Connect the balanced (24) or single-ended (25) zone 2 outputs on the KCT back  
panel to your amplifier(s).  
5. To power on, connect the AC power cord to the IEC power connector (31), then plug  
the AC power cord into the wall. KRELL KCT appears in the front panel display (13),  
indicating that the preamplifier is initializing. After initializing is complete, the KCT is in  
the stand-by mode. The red stand-by LED (2) illuminates.  
Operating the KCT Preamplifier  
After the KCT is connected to your system and to AC power, you can begin operation.  
Steps for basic operation follow:  
IMPORTANT  
Always mute or fully attenuate the preamplifier level when switching between active  
sources (such as a CD player, tape monitor, or VCR).  
Do not change the input connections to the preamplifier while the preamplifier is on.  
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Use care when setting high playback levels. Always lower the volume level at the first  
sign of loudspeaker distress.  
1. With the KCT preamplifier in the stand-by mode (red stand-by LED [2] illuminated),  
switch to the operational mode by pressing the front panel power button (1) or power  
key (32) on the remote control. The blue power LED (3) illuminates and there is an  
audible click. The KCT is ready for operation.  
2. With the preamplifier output muted or the volume fully attenuated, select a source  
manually through the front panel input select buttons (6) or through the input select  
keys (39) on the remote control. Start playing the source. Use the level control knob  
(14) or level keys (44) to set the volume to a comfortable listening level.  
Note  
The KCT automatically plays through the main zone until you select zone 2 operation.  
3. To return the KCT to the stand-by mode, press the power button (1) or power  
key (32).  
Krell recommends leaving the KCT in the stand-by mode when it is not playing music.  
If you wish to turn your system off:  
Turn your system off if it will not be used for a long period of time.  
1. Place the amplifiers in the stand-by mode.  
2. Press the power button (1) or power key (32) to switch the KCT to the stand-by  
mode.  
3. Turn off the amplifiers using the back panel power switch or by disconnecting them  
from AC power.  
4. Disconnect the KCT from AC power by unplugging the AC power cord from the wall.  
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Front Panel Description  
See Figure 1 on page 8  
The KCT preamplifier front panel provides power on, input and zone selection, level  
control, menu functions, and status display. Front panel features and their descriptions  
follow.  
Power  
1 Power Button  
Use this button to switch the KCT between the stand-by and the operational modes.  
2 Stand-by LED  
The red stand-by LED illuminates when the KCT is plugged into a standard AC wall  
receptacle, indicating that the KCT is ready to be switched to the operational mode.  
3 Power LED  
The blue power LED illuminates when the KCT is in the operational mode and flashes  
when remote control signals are received.  
Remote Control Functions  
4 Infrared Sensor  
The infrared sensor receives commands from the KCT remote control. For proper  
remote control operation, make sure the infrared sensor is not covered or obstructed.  
5 Infrared Transmitter LED  
The infrared transmitter LED flashes when the KCT sends infrared signals to another  
remote control. See Program Remote Menu, on page 31.  
Preamplifier Functions  
6 Input Select Buttons  
Use these buttons to select the corresponding rear panel input that is connected to a  
CAST (C-1, C-2), balanced (B-1, B-2), or single-ended (S-1, S-2, S-3) analog source.  
The front panel display (13) shows the active zone, the selected input, and volume  
level.  
7 Tape Button  
Use this button to select the corresponding rear panel input that is connected to a  
analog tape source. When TAPE is activated, the front panel display (13) shows the zone  
that is the pathway for the tape output. See Tape Output Menu, on page 30.  
8 Mute Button  
Use this button to mute the preamplifier output. To unmute, press the mute button  
again. To customize mute button operation, see Mute Menu, on page 29.  
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9 Phase Button  
Use this key to invert the absolute polarity of the variable output 180 degrees for the  
selected input. The front panel display (13) shows INVERT for the negative phase; the  
display remains blank for the positive phase.  
10 Zone Button  
Use this button to select the main zone (the main listening or viewing area) or zone 2  
(another listening area).  
11 Main Zone LED  
The red main zone LED illuminates when the main zone is activated. Zone status is also  
shown in the front panel display (13).  
12 Zone 2 LED  
The green zone 2 LED illuminates when zone 2 is activated. Zone status is also shown  
in the front panel display (13).  
Display  
13 Front Panel Display  
The front panel display provides preamplifier status messages, including input and zone  
selection, tape output status, volume and balance level, and menu selections.  
Level Control  
14 Level Control Knob  
Use this knob to increase or decrease system volume level or, with the balance key, to  
adjust balance. The level control knob is also used to select menu options to customize  
the KCT. See Customizing the KCT Preamplifier, on page 26.  
Menu Functions  
15 Menu Button  
Use the menu button to access menu options for customizing the KCT. The front panel  
display shows MAIN MENU and submenu name. See Customizing the KCT  
Preamplifier, on page 26.  
16 Enter Button  
Use this key to access submenu selections.  
10  
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Back Panel Description  
See Figure 2 on page 11  
The KCT preamplifier back panel provides all input and output connections, remote  
control inputs and outputs, and power connection. Back panel features and their  
descriptions follow.  
Inputs  
17 B-1 and B-2 Left and Right Balanced Inputs  
The KCT is equipped with two pairs of balanced analog source inputs with XLR  
connectors.  
18 S-1, S-2, and S-3 Left and Right Single-ended Inputs  
The KCT is equipped with three pairs of single-ended analog source inputs with RCA  
connectors.  
19 Tape Left and Right Inputs  
The KCT is equipped with one pair of single-ended tape source inputs with RCA  
connectors.  
20 C-1 and C-2 Left and Right CAST Inputs  
The KCT is equipped with two pairs of CAST inputs with 4-pin bayonet connectors, for  
use with Krell CAST-equipped input devices.  
Tape Output  
21 Tape Left and Right Outputs  
The KCT is equipped with one pair of tape outputs with RCA connectors.  
Main (Zone) Outputs  
The following outputs are for the main zone.  
22 Preamp Left and Right Outputs  
The KCT is equipped with two pairs of preamplifier outputs: one pair of balanced  
outputs with XLR connectors and one pair of single-ended outputs with RCA  
connectors.  
23 CAST Preamp Outputs  
The KCT is equipped with two pairs of CAST preamplifier outputs with 4-pin bayonet  
connectors, for use with Krell CAST-equipped amplifiers.  
Zone 2 Outputs  
The following outputs are for zone 2.  
24 Balanced Left and Right Outputs  
The KCT is equipped with one pair of balanced outputs with XLR connectors.  
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25 Single-ended Left and Right Outputs  
The KCT is equipped with one pair of single-ended outputs with RCA connectors.  
Back Panel Remote Connections  
26 Krell Link In and Out  
The KCT is equipped with a Krell Link communications input and output data port. Krell  
Link allows synchronized remote power on and off of other components connected with  
Krell Link. See Krell Link Connections and Operation, on page 19.  
27 12 VDC In and Out  
The KCT is equipped with three 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 KCT is switched to  
the 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.  
Notes  
The 12 VDC output power is limited to 30 ma.  
Consult the owner’s reference manual of the components used in a custom installation  
to take full advantage of the remote capabilities of the KCT.  
28 RC-5 In  
The KCT is equipped with an RC-5 input that makes custom installation easy and  
secure by accepting baseband RC-5 input commands from hardwired remote  
controllers.  
29 RS-232  
The KCT is equipped with an RS-232 port that receives messages from a computer-  
based control system, providing integrated control of all preamplifier functions. See the  
KCT developer’s reference, “RS-232 Port: Sending Commands and Interpreting Data,”  
for more information.  
Phono Stage Connector  
30 Phono Power  
The KCT is equipped with a phono power port, for connecting the KCT with a Krell KPE  
phono stage.  
Power  
31 IEC Power Connector  
The IEC power connector is for use with the provided IEC standard 15 amp AC power  
cord.  
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Figure 3 The KCT Remote Control  
34  
33  
32  
35  
36  
38  
37  
39  
40  
42  
41  
43  
44  
47  
46  
45  
48  
49  
Power  
Preamplifier Functions  
Level Control  
32 Power Key  
35 Mute Key  
43 Bal(ance) Key  
44 Level Keys  
Compact Disc Functions  
45 Pause Key  
Amplifier Functions  
33 Amp Pwr Key  
34 Amp Sel(ect) Key  
36 Phase Key  
37 Main Zone Key  
38 Z2 Key  
39 Input Select Keys  
40 Tape Key  
46 Stop Key  
47 Play Key  
Menu Functions  
41 Menu Key  
42 Enter Key  
48 Track Forward  
and Back Keys  
49 Search Forward  
and Back Keys  
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Remote Control Description  
See Figure 3 on page 14  
BATTERY INSTALLATION AND REMOVAL  
The KCT remote control uses two 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 battery  
receptacle.  
3. Replace and secure the backplate.  
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.  
The remote control provides power on, input and zone selections, level and balance  
control, menu, and compact disc functions. Remote control keys and their descriptions  
follow.  
Power  
32 Power Key  
Use this key to switch the KCT between the stand-by and the operational modes.  
Amplifier Functions  
33 Amp Pwr Key  
Use this key to activate Krell amplifiers connected to your system. The amp pwr key  
also activates the control component for amplifiers connected by Krell Link.  
34 Amp Sel(ect) Key  
Use this key to switch between CAST and balanced inputs on a Krell Full Power  
Balanced amplifier connected to your system. The red center LED illuminates when the  
CAST output is active.  
Preamplifier Functions  
35 Mute Key  
Use this key to mute the preamplifier output. To unmute, press the mute key again. To  
customize mute key operation, see Mute Menu, on page 29.  
36 Phase Key  
Use this key to invert the absolute polarity of the variable output 180 degrees for the  
selected input. The front panel display (13) shows INVERT for the negative phase; the  
display remains blank for the positive phase.  
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37 Main Zone Key  
Use this key to select the main zone (the main listening or viewing area). The red main  
zone LED (11) on the front panel illuminates when the main zone is activated.  
38 Z2 Key  
Use this key to select zone 2. The green zone 2 LED (12) illuminates when zone 2 is  
activated.  
Note  
Both zones can play simultaneously.  
39 Input Select Keys  
Use these keys to select the corresponding rear panel input that is connected to a  
CAST (C-1, C-2), balanced (B-1, B-2), or single-ended (S-1, S-2, S-3) analog source.  
The front panel display (13) shows the selected input, the active zone, and volume  
level.  
40 Tape Key  
Use this key to select the corresponding rear panel input that is connected to a tape  
analog source. When TAPE is activated, the front panel display (13) shows the zone that  
is the pathway for the tape output. See Tape Output Menu, on page 30.  
Menu Functions  
41 Menu Key  
Use this key to access the menu options for customizing the KCT. The front panel  
display (13) shows MAIN MENU and submenu name. See Customizing the KCT  
Preamplifier, on page 26.  
42 Enter Key  
Use this key to access submenu selections.  
Level Control  
43 Bal(ance) Key  
Use this key, along with level keys (44) or level knob (14) on the front panel, to balance  
output levels. The front panel display (13) shows balance status for three seconds.  
44 Level Keys  
Use these keys to increase or decrease system volume level or, with the balance key  
(43), to adjust balance. The level keys are also used to select menu options to  
customize the KCT. See Customizing the KCT Preamplifier, on page 26.  
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Compact Disc Functions  
The compact disc keys on the KCT remote control are functional with all Krell compact  
disc players.  
45 Pause Key  
Use this key to temporarily suspend playing the current compact disc track. To resume  
playing the track at the point pause was engaged, press pause again or press the play  
key (47).  
46 Stop Key  
Use this key to end compact disc playback.  
47 Play Key  
Use this key to begin compact disc playback.  
48 Track Forward and Back Keys  
Use these keys to select and begin playing the track that follows or precedes the current  
track.  
49 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 manual  
for your Krell compact disc player.  
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Connecting the KCT Preamplifier to Your System  
See Figure 2 on page 11  
INPUT AND OUTPUT CONNECTIONS  
Krell recommends using its proprietary Krell CAST system for unparalleled sonic  
performance between the KCT and other CAST-equipped components.  
The KCT also offers conventional 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.  
The XLR pin configuration is described below:  
Pin 1 Ground  
Pin 2 Non-inverting (0°)  
Pin 3 Inverting (180°)  
Inputs and outputs are located on the KCT back panel. Maintain the correct left/right  
orientation.  
IMPORTANT  
Connecting non-CAST components to CAST inputs or outputs can damage your  
equipment and void your warranty. Do not attempt to alter CAST cable ends or CAST  
inputs or outputs. It is electrically impossible to convert CAST input/output chassis  
mount connectors for balanced or single-ended operation.  
Follow these steps to connect the KCT preamplifier to your system.  
1. Neatly arrange and organize the wiring to and from the KCT and all components.  
Separate AC wires from audio cables to prevent hum or other unwanted noise from  
being introduced into the system.  
2. Connect the outputs of your source equipment to the appropriate CAST (20),  
balanced (17), single-ended (18) or tape (19) inputs on the KCT back panel.  
3. Connect the appropriate main (22 or 23) and zone 2 (24 or 25) outputs on the KCT  
back panel to your amplifier(s).  
4. Connect the KCT to AC power. Connect the AC power cord to the IEC power  
connector (31), then plug the AC power cord into the wall. KRELL KCT appears in the  
front panel display (13), indicating that the preamplifier is initializing. After initializing  
is complete, the KCT is in the stand-by mode. The red stand-by LED (2) illuminates.  
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Krell Link Connections and Operation  
Krell Link in/out connectors on the KCT back panel allow you to synchronize remote  
control operation for systems that include multiple amplifiers and associated  
components. When the Krell Link in/out connectors are used, the remote capabilities of  
the linked components are controlled from one amplifier or preamplifier, called the  
control component. The linked components respond to stand-by and operational mode  
commands from the control component via MIDI cables. See Krell Link, on page 32, for  
menu options to customize Krell Link operation.  
Note  
Krell Link uses standard five pin MIDI communication cables, sometimes called MIDI  
Plus cables. MIDI cables can be purchased from your authorized distributor or dealer, or  
from an audio supply store.  
Connecting Components through Krell Link  
1. Turn all components off. This ensures all components are synchronized when the  
MIDI cable is connected.  
2. Select the component to be the control component. The control component must be  
in plain view for proper remote control operation.  
3. Connect one end of the MIDI cable to the Krell Link out connector (26) on the control  
component back panel.  
4. Connect the other end of a MIDI cable to the Krell Link in connector (26) on the back  
panel of the next component.  
5. To link another component, connect another MIDI cable to the Krell Link out  
connector on the back panel of the second component. Connect the remaining end of  
the MIDI cable to the Krell Link in connector, on the back panel of a third component.  
6. Link additional components, if desired.  
The components are now ready for operation with Krell Link.  
Krell Link Operation  
1. When all components are connected, as described above, place each component in  
the stand-by mode. This ensures all components are synchronized when signals from  
the control component are sent to linked components.  
2. Switch the control component to the operational mode from the component’s front  
panel power button or through the power key on the remote control. The linked  
components simultaneously switch to the operational mode.  
An individual linked component can be switched between the stand-by and the  
operational modes from its front panel. Switching a linked component temporarily  
breaks the chain of linked components. To re-establish linked operation, return all  
components to the stand-by mode.  
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Tape Input and Output  
The KCT preamplifier has a discrete tape input and output. The tape output is used to  
channel a signal from a C-1, C-2, B-1, B-2, S-1, S-2, or S-3 input to a recording device  
or processor. You can use the tape feature in two ways:  
1. 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 either the C-1, C-2, B-1, B-2, S-1,  
S-2, or S-3 input select buttons (6) or keys (39). Press the tape button (7) or tape key  
(40) to switch between the tape recorder output and the input source.  
2. Use the tape output to create a processor loop, when the KCT is connected to a  
graphic equalizer or other ancillary equipment. To activate this function, connect the  
equipment to the KCT tape outputs (21) as described in the equipment manu-  
facturer’s manual. Press the tape button (7) or tape key (40) to switch between the  
processor output and the input source.  
For both tape features, the KCT front panel display (13) shows TAPEOUT ZONE 1 or  
TAPEOUT ZONE 2, indicating the zone that is the pathway for the tape output. The display  
changes to TAPE MONITOR after three seconds.  
You can also configure the tape output to record music from an input device through  
zone 2 while you listen to music from another input device through the main zone. You  
can also record through the main zone and listen through zone 2. To select a zone for  
tape output, see Tape Output Menu, on page 30.  
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Operating the KCT Preamplifier  
The KCT preamplifier is easy to install and operate. Instructions follow for on/off and  
stand-by operation, and zone operating options.  
IMPORTANT  
Always mute or fully attenuate the preamplifier level when switching between active  
sources (such as a CD player, tape monitor, or VCR).  
Do not change the input connections to the preamplifier while the preamplifier 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  
1. With the KCT plugged into the AC power source and in the stand-by mode (red  
stand-by LED [2] illuminated), switch to the operational mode by pressing the front  
panel power button (1) or power key (32) on the remote control. The blue power LED  
(3) illuminates and there is an audible click. The KCT is ready for operation.  
2. With the preamplifier output muted or the volume fully attenuated, select a source  
manually through the front panel input select buttons (6) or through the input select  
keys (39) on the remote control. Start playing the source. Use the level control knob  
(14) or level keys (44) to set the volume to a comfortable listening level.  
Note  
The KCT automatically plays through the main zone until you select zone 2 operation.  
3. To return the KCT to the stand-by mode, press the power button (1) or power key  
(32).  
Krell recommends leaving the KCT in the stand-by mode when it is not playing music.  
If you wish to turn your system off:  
Turn your system off if it will not be used for a long period of time.  
1. Place the amplifiers in the stand-by mode.  
2. Press the power button (1) or power key (32) to switch the KCT to the stand-by  
mode.  
3. Turn off the amplifiers using the power switch, or unplug the AC power cord.  
4. Disconnect the KCT from AC power by unplugging the AC power cord from the wall.  
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MAIN ZONE AND ZONE 2 OPERATION  
The KCT preamplifier’s two-zone operation offers a number of listening options.  
Play Both Zones  
This option allows you to play one input device through both zones or play a different  
device through each zone simultaneously, and adjust volume levels for each zone.  
1. Press the power button (1) or power key (32) to switch the KCT from the stand-by to  
the operational mode. The front panel display (13) shows the main zone is active, the  
currently selected input, and main zone volume level.  
2. Press the input select button (6) or key (39) to select the device you wish to play in  
the main zone.  
3. Begin playing the device. Use the level control knob (14) or level keys (44) to adjust  
main zone volume to the desired level.  
4. Press the zone button (10) or Z2 key (38) to select zone 2. The front panel display  
shows zone 2 is active, the currently selected input, and zone 2 volume level.  
5. Press the input select button (6) or key (39) to choose another device to play in zone  
2. You can choose the same input device to play in both zones, if you wish.  
6. Begin playing the device. Use the level control knob (14) or level keys (44) to adjust  
zone 2 volume to the desired level.  
To turn off this option:  
1. Press the Z2 key (38) to select zone 2.  
2. Press the power button (1) or power key (32) once. This turns off zone 2 and  
switches you to the main zone.  
3. Press the power button or key again to turn off the main zone and return to the stand-  
by mode.  
Play Either Zone  
This option allows you to play an input device in either the main zone or zone 2.  
Main Zone Only  
1. Press the power button (1) or power key (32) to switch the KCT from the stand-by to  
the operational mode. The front panel display shows the main zone is active, the  
currently selected input, and the main zone volume level.  
2. Press the input select button (6) or key (39) to select the device you wish to play in  
the main zone.  
3. Begin playing the device. Use the level control knob (14) or level keys (44) to adjust  
the main zone volume to the desired level.  
4. Press the main zone key (37) again. The preamplifier returns to the stand-by mode.  
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Zone 2 Only  
1. With the KCT in the stand-by mode, press the zone button (10) or Z2 key (38). The  
front panel display (13) shows zone 2 is active.  
2. Press the input select key (39) to select the device you wish to play in zone 2. The  
KCT will switch to the operational mode and the device will play in zone 2 only.  
3. Press the zone button (10) or Z2 key (38) again. Zone 2 stops playing and the KCT  
switches back to the stand-by mode.  
Note:  
When you press the power button (1) or key (32) to return to the operational mode, the  
KCT is in the main zone.  
Play and Record  
This option allows you to play an input device through the main zone while sending  
output from another device through zone 2 for recording. You can also record through  
the main zone and listen through zone 2.  
1. Press the power button (1) or key (32) to switch the KCT from the stand-by to the  
operational mode. The front panel display shows the main zone is active, the  
currently selected input, and main zone volume level.  
2. Press the input select button (6) or key (39) to select the input device that you want to  
play through the main zone.  
3. Begin playing the device. Use the level control knob (14) or level keys (44) to adjust  
the main zone volume to the desired listening level.  
4. Press the menu button (15) or key (41) to select the main menu. The front panel  
display (13) shows MENU.  
5. Use the level control knob (14) or level keys (44) to select the TAPE OUTPUT MENU.  
6. Press the enter button (16) or key (42) to access the submenu. The front panel  
display shows OUTPUT FROM ZONE1.  
7. Use the level control knob (14) or level keys (44) to select OUTPUT FROM ZONE2.  
8. Press the menu button or key to exit the main menu.  
9. Press the zone button (10) or Z2 key (38) to select zone 2.  
10. Press the input select button (6) or key (39) to select the input device that you want  
to record through zone 2. Begin playing the device.  
11. Press the tape button (7) or key (40). The front panel display shows TAPEOUT ZONE2.  
The input will begin recording through zone 2. The front panel display shows TAPE  
MONITOR after three seconds.  
While you are recording through zone 2, you can also press the zone button (10) or  
main zone key (37) to check playback through the main zone, without interrupting the  
recording through zone 2.  
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To stop recording:  
1. Press the zone button (10) or Z2 key (38) to select zone 2.  
2. Press the tape button (7) or key (40).  
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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 KCT 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 off, remove the interconnect cables, then turn the preamplifier  
on. If the hum disappears, turn the preamplifier off and reinsert one of the  
interconnect cables. Turn the amplifier 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 it.  
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Customizing the KCT Preamplifier  
The KCT preamplifier’s easy-to-use menu options allow you to select and set preferred  
operating options for balance, inputs, trims, Theater Throughput mode, display  
brightness, mute, trigger setup and delay, tape output, AC mains, remote programming,  
setup memory, and Krell Link. The instructions below follow the menu order on your  
KCT.  
IMPORTANT  
You do not need to press enter to set a selection. The last selection chosen is the one  
entered in the system.  
If at any time you wish to exit the menu without changing the settings, select EXIT MENU  
(the last menu option) and press the enter button or key.  
Z1 AND Z2 BALANCE  
This option allows you to add a fixed positive offset to the main zone and zone 2  
balance. With this feature, you can set the balance that is unique to your system’s  
configuration.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. The front panel display (13) reads Z1 BALANCE (the default).  
3. Press the enter button (16) or key (42). The front panel display shows ZONE 1  
BALANCE and the current balance setting.  
4. Use the level control knob (14) or level keys (44) to adjust the balance to the desired  
setting from 0 to +6 dB, in .5 dB increments.  
5. Press the enter button (16) or key (42) to return to the main menu or press the menu  
button (15) or key (41) to exit the menu mode.  
To adjust the fixed offset for zone 2:  
1. Press the menu button (15) or key (41) to select the main menu  
2. Use the level control knob (14) or level keys (44) to select Z2 BALANCE.  
3. Repeat steps 4 and 5 above.  
INPUT NAME MENU  
This option allows you to assign names to all inputs, for easy identification.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select INPUT NAME MENU.  
3. Press the enter button (16) or key (42). The front panel display (13) shows INPUT  
NAMES and S-1 (the default).  
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4. Use the level control knob (14) or level keys (44) to select the desired input from the  
list (S-1, B-1, C-1, tape, etc.).  
5. Press the enter button (16) or key (42) to access the submenu.  
6. Use the level control knob (14) or level keys (44) to scroll through the list of naming  
options (phono, aux, etc.). The front panel display (13) will show the new input name  
when you exit the menu.  
7. To name another input, press the enter button (16) or key (42) to return to the input  
name menu.  
8. Repeat steps 4 through 6.  
9. Press the menu button (15) or key (41) to exit the menu mode.  
INPUT LEVEL TRIM  
This option allows you to add a fixed positive or negative volume offset to compensate  
for input devices with significantly different output levels. After adjusting input level trim,  
you can switch between these input devices without major changes in volume.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select INPUT LEVEL TRIM.  
3. Press the enter button (16) or key (42). The front panel display (13) shows INPUT  
LEVEL TRIMS and S1 (the default).  
4. Use the level control knob (14) or level keys (44) to select the desired input from the  
list (S-1, B-1, tape, etc).  
5. Press the enter button (16) or key (42). The front panel display (13) shows the  
existing volume.  
6. Use the level control knob (14) or level keys (44) to scroll through the available  
volume settings from –6 to +6 dB, in .5 dB increments.  
7. To adjust level trim for another input, press the enter button (16) or key (42) to return  
to the input level trim menu.  
8. Repeat steps 4 through 6.  
9. Press the enter button (16) or key (42) to return to the main menu, or press the menu  
button (15) or key (41) to exit the menu mode.  
INPUT BALANCE TRIM  
This option allows you to add different left and right balance offsets for different inputs.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select INPUT BALANCE TRIM.  
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3. Press the enter button (16) or key (42). The front panel display (13) shows INPUT  
BALANCE TRIM and S-1 (the default).  
4. Use the level control knob (14) or level keys (44) to select the desired input  
(S-1, B-1, tape, etc.).  
5. Press the enter button (16) or key (42). The front panel display (13) shows the current  
balance of the selected input.  
6. Use the level control knob (14) or level keys (44) to scroll through the list of available  
balance offsets from 0 to +6 dB, right and left, in .5 dB increments.  
7. To set the balance trim for another input, press the enter button (16) or key (42) to  
return to the input balance trim menu.  
8. Repeat steps 4 through 6.  
9. Press the enter button (16) or key (42) to return to the main menu, or press the menu  
button (15) or key (41) to exit the menu mode.  
THEATER (THROUGHPUT) MODE  
This option allows you to simplify the integration of an audio/video surround sound  
processor into your system by setting the CAST, balanced, or single-ended inputs to  
operate as a unity gain stage. Krell calls this configuration Theater Throughput.  
When you configure a KCT input for Theater Throughput, the KCT volume and balance  
controls are transferred to the audio/video surround sound processor, for integrated  
volume and balance management and ease of operation. As long as the KCT input is  
configured for Theater Throughput and connected to the audio/video surround sound  
processor’s main outputs, all system volume and balance adjustments are made  
through the surround sound processor. When you disengage the KCT input from  
Theater Throughput, the volume and balance controls revert to the KCT.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select THEATER MODE.  
3. Press the enter button (16) or key (42). The front panel display (13) shows THEATER  
MODE and S-1.  
4. Use the level control knob (14) or level keys (44) to select the input to be placed in  
Theater Throughput mode.  
5. Press the enter button (16) or key (42). The front panel display (13) shows OFF (the  
default).  
6. Use the level control knob (14) or level keys (44) to select whether Theater  
Throughput mode is off or on.  
7. To select or disengage Theater Throughput for another input, press the enter button  
(16) or key (42) to return to the theater mode menu.  
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8. Repeat steps 4 through 6.  
9. Press the menu button (15) or key (41) to exit the menu mode.  
BRIGHTNESS  
This option allows you to adjust the front panel display brightness.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select BRIGHTNESS.  
3. Press the enter button (16) or key (42). The front panel display (13) shows HIGH (the  
default).  
4. Use the level control knob (14) or level keys (44) to select the desired brightness  
option (HIGH, FULL, BRIGHTNESS OFF, LOW, AND MEDIUM). The front panel display (13)  
illustrates each level of brightness.  
5. Press the enter button (16) or key (42) to return to the main menu or press the menu  
button (15) or key (41) to exit the menu mode.  
Note  
If you choose OFF, the front panel display will remain on until you exit the menu mode.  
Press menu again to display the main menu.  
MUTE MENU  
This option allows you to customize mute button or mute key to operate in either the  
main zone or zone 2, only in the zone that is currently active, or in both zones.  
1. Press the menu button (15) or key (41).  
2. Use the level control knob (14) or level keys (44) to select MUTE MENU.  
3. Press the enter button (16) or key (42). The front panel display (13) shows MUTE  
ACTIVE ZONE (the default).  
4. Use the level control knob (14) or level keys (44) to highlight the mute options (MUTE  
ZONE 1, MUTE ZONE 2, MUTE BOTH ZONES, MUTE ACTIVE ZONE).  
5. Press the enter button (16) or key (42) to return to the main menu or press the menu  
button (15) or key (41) to exit the menu mode.  
OUTPUT TRIGGER SETUP  
This option allows you to configure the activation of three 12 VDC (12 Volt trigger)  
outputs to be always off or on, or to activate only with selected zones.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select OUTPUT TRIGGER SETUP.  
3. Press the enter button (16) or key (42). The front panel display (13) shows TRIGGER 1.  
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4. Use the level control knob (14) or level keys (44) to select the desired trigger  
(1, 2, or 3).  
5. Press the enter button (16) or key (42) again. The front panel display (13) shows  
ALWAYS OFF (the default).  
6. Use the level control knob (14) or level keys (44) to select the desired trigger option  
(ALWAYS OFF, ON FOR ZONE 1, ON FOR ZONE 2, ON FOR BOTH ZONES, ALWAYS ON).  
7. To configure another trigger, press the enter button (16) or key (42) to return to the  
output trigger setup menu.  
8. Repeat steps 4 through 6.  
9. Press the menu button (15) or key (41) to exit the menu mode.  
TAPE OUTPUT MENU  
This option allows you to choose the zone through which the tape output receives its  
signal. With this option you can record music from one input device through one zone  
while listening to music from another device through the other zone.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select TAPE OUTPUT.  
3. Press the enter button (16) or key (42). The front panel display (13) shows  
OUTPUT FROM ZONE1 (the default).  
4. Use the level control knob (14) or level keys (44) to select the desired output (OUTPUT  
FROM ZONE1, OUTPUT FROM ZONE2).  
5. Press the enter button (16) or key (42) to return to the main menu or press the menu  
button (15) or key (41) to exit the menu mode.  
AC MAINS MENU  
This option allows the KCT to go directly from off to the operational mode and bypass  
the stand-by mode.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select ACMAINS MENU.  
3. Press the enter button (16) or key (42). The front panel display (13) shows ACMAINS  
OFF (the default).  
4. Use the level control knob (14) or level keys (44) to select ACMAINS OFF or ACMAINS ON.  
5. Press the enter button (16) or key (42) to return to the main menu or press the menu  
button (15) or key (41) to exit the menu mode.  
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PROGRAM REMOTE MENU  
This option allows the KCT to send its remote control commands to a learning or  
programmable remote control.  
Note  
You must place the programmable remote in front of the KCT infrared sensor to send  
remote control commands.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select PROGRAM REMOTE MENU.  
3. Press the enter button (16) or key (42). The front panel display (13) shows S1 SELECT  
(the default).  
4. Use the level control knob (14) or level keys (44) to scroll through all the remote  
control command options.  
5. Press the enter button (16) or key (42). The front panel display (13) shows  
TRANSMITTING.  
6. To select additional commands, press the enter button (16) or key (42) to return to  
the program remote menu.  
7. Repeat steps 4 and 5 to select and transmit additional commands.  
8. The last command on the submenu is EXIT. Select EXIT and press the enter button  
(16) or key (42) to return to the main menu.  
9. Press the menu button (15) or key (41) to exit the menu mode.  
INPUT TRIGGER SETUP  
This option allows you to configure which zone is activated by the 12 VDC (12 Volt  
trigger) input.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select INPUT TRIGGER SETUP.  
3. Press the enter button (16) or key (42). The front panel display (13) shows TURN ON  
BOTH (the default).  
4. Use the level control knob (14) or level keys (44) to select the preferred input trigger  
setup option (TURN ON BOTH, INACTIVE, TURN ON ZONE 1, TURN ON ZONE 2).  
5. Press the enter button (16) or key (42) to return to the main menu or press the menu  
button (15) or key (41) to exit the menu mode.  
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SETUP MEMORY  
This option allows you to save or recall new settings, or reset all settings to the factory  
defaults. Remember, to exit the setup memory without altering the settings, select exit  
and press the enter button (16) or key (42). You return to the main menu.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select SETUP MEMORY.  
3. Press the enter button (16) or key (42). The front panel display (13) shows SAVE ALL  
SETTINGS (the default).  
4. Use the level control knob (14) or level keys (44) to select the preferred setup  
memory (SAVE ALL SETTINGS, RECALL ALL SETTINGS, FACTORY SETTINGS).  
5. Press the enter button (16) or key (42). The front panel display (13) shows PLEASE  
WAIT. The KCT switches into the stand-by mode and reinitializes. The front panel  
display shows KRELL KCT.  
6. Press the power button (1) or key (32) to return the KCT to the operational mode. The  
settings you selected are stored.  
KRELL LINK  
This option allows you to customize the operation of the KCT and Krell amplifiers  
connected with Krell Link. See Krell Link Connections and Operation, on page 19.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select KRELL LINK.  
3. Press the enter button (16) or key (42). The front panel display (13) shows DISABLED  
(the default).  
4. Use the level control knob (14) or level keys (44) to select the preferred Krell Link  
option (DISABLED, ENABLED, AUTO ON).  
Following are the definition of terms used with Krell Link.  
Disabled. The amplifiers connected through Krell Link remain off when the KCT is  
switched to the operational mode, for example, if you wish to record without listening to  
music. The amplifiers can not be powered on when this option is engaged.  
Enabled. The amplifiers connected through Krell Link remain off when the KCT is  
switched to the operational mode. To turn the amplifiers on and off, use the amp pwr  
key (33) on the KCT remote control.  
Auto On. The amplifiers connected through Krell Link automatically power on when you  
switch the KCT to the operational mode and power off when you turn the KCT off.  
5. Press the enter button (16) or key (42) to return to the main menu or press the menu  
button (15) or key (41) to exit the menu mode.  
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TRIGGER DELAY SETUP  
This option allows you to customize the number of seconds (from 0 to 5) before a trigger  
activates.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select TRIGGER DELAY SETUP.  
3. Press the enter button (16) or key (42). The front panel display (13) shows TRIGGER 1.  
4. Use the level control knob (14) or level keys (44) to select the trigger (1, 2, or 3) that  
you wish to configure.  
5. Press the enter button (16) or key (42).  
6. Use the level control knob (14) or level keys (44) to select the trigger delay time (from  
0 to 5 seconds).  
7. To configure the delay for another trigger, press the enter button (16) or key (42) to  
return to the trigger delay setup menu.  
8. Repeat steps 4 through 6.  
9. Press the enter button (16) or key (42) to return to the main menu or press the menu  
button (15) or key (41) to exit the menu mode.  
EXIT MENU  
This option allows you to exit the menu mode after you have set all preferred  
configuration options. Exit also allows you to exit any menu or submenu without  
changing the settings.  
1. Press the menu button (15) or key (41) to access the main menu.  
2. Use the level control knob (14) or level keys (44) to select EXIT MENU.  
3. Press the enter button (16) or key (42). You exit the menu mode.  
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Questions and Answers  
Q. Should I leave my KCT on at all times?  
A. Yes, Krell recommends that you leave your KCT preamplifier in the stand-by mode  
when it is not playing music. Turn your system off only if it will not be used for a long  
period of time.  
Q. When I turn on the KCT there is a loud hum through the loudspeakers. What should  
I do?  
A. When a new component is introduced into your system, a low frequency hum may  
occur in one or both loudspeakers. Check all input and output connections and cables,  
making sure they are of sound construction (see Troubleshooting System Noise, on  
page 25). If the interconnects and cables are sound, you may be experiencing a ground  
loop, which can often be easily eliminated. Please contact your authorized dealer,  
distributor, or Krell for suggestions.  
Q. Can I use the KCT CAST inputs or outputs with other manufacturers’ components?  
A. No. Only CAST-equipped components can be connected to CAST inputs or outputs.  
Connecting non-CAST components to these inputs or outputs can damage your  
equipment and void your warranty. See Connecting the KCT Preamplifier to your  
System, on page 18.  
Q. I want my CD player to play through the main zone and the radio to play through  
zone 2. Can I play one louder than the other?  
A. Yes. Each zone on the KCT has independent volume control, so you can play music  
from one input device at the desired volume through the main zone, and play a second  
device through zone 2 at a different volume. You can also play an input device through  
one zone and record through the other zone, again, at separate volume levels. See  
Main Zone and Zone 2 Operation, on page 22. Remember that you’ll need one  
amplifier to drive your loudspeakers in the main zone and a second amplifier for the  
loudspeakers in zone 2.  
Q. When I select the B-1 input on the KCT, one channel seems to have less gain than  
the other does. Is something wrong?  
A. First, check the balance level using the balance and level keys. (See Remote  
Control Description, on page 15.). If balance level is correct, check that the balanced  
input or output internal cable terminations are properly connected. Locate the channel  
that appears to have less gain. Switch that channel's input cables. If the problem now  
appears in the other channel, the cable is defective. If the problem remains in the  
original channel, check the output cables using the same procedure.  
If the balance settings or cables are not causing the difference in gain, contact your  
authorized Krelldealer, distributor, or Krell.  
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Warranty  
This Krell product has a limited warranty of five years for parts and labor on circuitry. Should  
this 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.  
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.  
The warranty does not apply to damage caused by acts of God or nature.  
The warranty on this page shall be in lieu of any other warranty, expressed or implied, includ-  
ing, but not limited to, any implied warranty of merchantability 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 owners 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 repurchased  
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 originally shipped,  
through the authorized Krell distributor for that country, and at the factory. There may be restric-  
tions on or changes to Krells warranty because of regulations 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 ser-  
vice, 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 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 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 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 unit. Replacement  
parts and/or products will be furnished only to the distributor performing 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 accident, abuse,  
misuse, natural or personal disaster, or unauthorized modification.  
Any unauthorized voltage conversion, disassembly, component replacement, perfora-  
tion of chassis, updates, or modifications performed to the unit will void the warranty.  
The operating voltage of this unit 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 owners 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.  
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Return Authorization  
Procedure  
HOW TO EXPEDITE  
SERVICE  
If you believe there is a problem with your component, please con-  
tact 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  
203-799-9954  
Monday-Friday, 9:00 am to 5:00 pm EST  
203-799-9796  
FAX  
E-MAIL  
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 product  
during shipment to the Krell factory and ensure all freight (ship-  
ping) 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.  
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 notified  
before the product is returned.  
IMPORTANT  
To purchase additional packaging, please contact your authorized  
Krell dealer, distributor, or the Krell Service Department for assis-  
tance.  
HOW TO PURCHASE  
ADDITIONAL PACKING  
SERIAL NUMBER  
Your KCT product serial number is:  
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Specifications  
Inputs  
2 pr. CAST (Lemo)  
2 pr. Balanced (XLR)  
3 pr. Single-ended (RCA)  
Main Outputs  
2 pr. CAST (Lemo)  
1 pr. Balanced (XLR)  
1 pr. Single-ended (RCA)  
Zone 2 Outputs  
Tape Loop  
1 pr. Balanced (XLR)  
1 pr. Single-ended (RCA)  
1 pr. Single-ended Inputs (RCA), 1 pr. Single-ended Record  
Outputs (RCA), Buffered, with Programmable Zone  
Control Inputs  
1 RS-232 Input (9-pin D-subminiature Connector)  
1 RC-5 Input (1/4-inch Coaxial Connector)  
1 12V Trigger Input (3.5mm Connector)  
Control Outputs  
3 Individually Programmable 12V Triggers  
(3.5mm Connector), 1 Krell Remote Link (5-pin DIN  
Connector)  
Power Inputs  
Power Outputs  
Voltage Gain  
1 IEC AC Mains Receptacle  
1 20V DC for KPE (9-pin D-subminiature Connector)  
12 dB (Balanced Output),  
6 dB (Single-ended Output)  
Current Gain  
12 dB (CAST Output)  
Volume Controls  
16-bit Discrete R-2R Ladder (Main Zone)  
16-bit Multiplying DAC (Zone 2)  
Input Overload  
12 mA RMS CAST  
12 V RMS Balanced or Single-ended  
Output Overload  
7 V RMS Single-ended  
14 V RMS Balanced  
14 mA RMS CAST  
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Frequency Response  
0.4 Hz-220 kHz 0.1 dB (Main Zone)  
0.1 Hz-1.5 MHz 3 dB (Main Zone)  
0.9 Hz-100 kHz 0.1 dB (Zone 2)  
0.4 Hz-400 kHz 3 dB (Zone 2)  
THD+Noise  
<0.005% 20 Hz-20 kHz Balanced or Single-ended  
<0.004% 20 Hz-20 kHz CAST  
Residual Noise  
<-95 dB, wideband, unweighted  
<-109 dB, “A”-weighted  
AC Mains Requirements 100, 120, 200, 220, or 240 V AC; 50 or 60 Hz; 60 W  
Dimensions  
19w x 4.5h x 14.5d in.  
48w x 11.5h x 36.5d cm  
Weight  
Shipping  
Unit Only  
23 lb., 10.5 kg  
19 lb., 8.6 kg  
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Krell Industries, Inc.  
45 Connair Road  
Orange, CT 06477-3650 USA  
KCT  
Krell Current Tunnel  
CAST Preamplifier  
TEL 203-799-9954, FAX 203-891-2028  
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