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Krell Industries KCT - page 1
KCT Krell Current T unnel CAST Preamplifier Instructions for Use Owner ’ s Reference THE LEADER IN AUDIO ENGINEERING ...
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Krell Industries KCT - page 2
KCT Krell Current T unnel CAST Preamplifier v 01.0 Krell Industries, Inc. 45 Connair Road Orange, CT 06477-3650 USA TEL 203-799-9954 F AX 203-891-2028 E-MAIL krell@krellonline.com WEBSITE http://www .krellonline.com This product is manufactured in the United States of America. Krell ® is a registered trademark of Krell Industries, Inc., and i s re ...
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Krell Industries KCT - page 3
Krell Current Tunnel iii Contents Page INTRODUCTION 1 DEFINITION OF TERMS 1 REVOLUTIONARY KRELL CAST TECHNOLOGY 3 UNPACKING 5 PLACEMENT 5 AC Power Guidelines 5 QUICK START 6 FRONT PANEL DESCRIPTION 9 BACK PANEL DESCRIPTION 12 REMOTE CONTROL DESCRIPTION 15 Battery Installation and Removal 15 CONNECTING THE KCT PREAMPLIFIER TO YOUR SYSTEM 18 Input an ...
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Krell Industries KCT - page 4
iv Krell Current Tunnel Contents, continued Page AC Mains Menu 30 Program Remote Menu 31 Input Trigger Setup 31 Setup Memory 32 Krell Link 32 Trigger Delay Setup 33 Exit Menu 33 QUESTIONS AND ANSWERS 34 WARRANTY 35 RETURN AUTHORIZATION PROCEDURE 36 SPECIFICATIONS 37 List of Illustrations Figure 1 The KCT Front Panel 8 Figure 2 The KCT Back Panel 11 ...
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Krell Industries KCT - page 5
Krell Current Tunnel 1 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 ...
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Krell Industries KCT - page 6
2 Krell Current Tunnel 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 o ...
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Krell Industries KCT - page 7
Krell Current Tunnel 3 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 rep ...
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Krell Industries KCT - page 8
4 Krell Current Tunnel 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 produ ...
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Krell Industries KCT - page 9
Krell Current Tunnel 5 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 ...
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Krell Industries KCT - page 10
6 Krell Current Tunnel 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 parenth ...
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Krell Industries KCT - page 11
Krell Current Tunnel 7 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 blu ...
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Krell Industries KCT - page 12
Figure 1 The KCT Front Panel Power 1 Power Button 2 Stand-by LED 3 Power LED Remote Control Functions 4 Infrared Sensor 5 Infrared T ransmitter LED 1 Preamplifier Functions 6 Input Select Buttons 7 T ape Button 8 Mute Button 9 Phase Button 10 Zone Button 1 1 Main Zone LED 12 Zone 2 LED Display 13 Front Panel Display Level Control 14 Level Control K ...
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Krell Industries KCT - page 13
Krell Current Tunnel 9 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 mod ...
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Krell Industries KCT - page 14
10 Krell Current Tunnel 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) ...
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Krell Industries KCT - page 15
Figure 2 The KCT Back Panel Inputs 17 B-1 and B-2 Left and Right Balanced Inputs 18 S-1, S-2, and S-3 Left and Right Single-ended Inputs 19 T ape Left and Right Inputs 20 C-1 and C-2 Left and Right CAST Inputs T ape Output 21 T ape Output Main (Zone) Outputs 22 Preamp Left and Right Outputs 23 CAST Preamp Outputs Zone 2 Outputs 24 Balanced Left and ...
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Krell Industries KCT - page 16
12 Krell Current Tunnel 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 balan ...
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Krell Industries KCT - page 17
Krell Current Tunnel 13 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 componen ...
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Krell Industries KCT - page 18
Figure 3 The KCT Remote Control 32 35 43 45 48 36 34 38 39 40 42 47 49 33 37 41 46 44 Preamplifier Functions 35 Mute Key 36 Phase Key 37 Main Zone Key 38 Z2 Key 39 Input Select Keys 40 T ape Key Menu Functions 41 Menu Key 42 Enter Key Level Control 43 Bal(ance) Key 44 Level Keys Compact Disc Functions 45 Pause Key 46 Stop Key 47 Play Key 48 T rack ...
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Krell Industries KCT - page 19
Krell Current Tunnel 15 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 ...
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Krell Industries KCT - page 20
16 Krell Current Tunnel 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 simultaneousl ...
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Krell Industries KCT - page 21
Krell Current Tunnel 17 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 ...
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Krell Industries KCT - page 22
18 Krell Current Tunnel 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 ...
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Krell Industries KCT - page 23
Krell Current Tunnel 19 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 ...
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Krell Industries KCT - page 24
20 Krell Current Tunnel 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 ...
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Krell Industries KCT - page 25
Krell Current Tunnel 21 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 chang ...
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Krell Industries KCT - page 26
22 Krell Current Tunnel 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) ...
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Krell Industries KCT - page 27
Krell Current Tunnel 23 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 th ...
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Krell Industries KCT - page 28
24 Krell Current Tunnel 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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Krell Industries KCT - page 29
Krell Current Tunnel 25 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 out ...
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Krell Industries KCT - page 30
26 Krell Current Tunnel 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 instru ...
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Krell Industries KCT - page 31
Krell Current Tunnel 27 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 ...
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Krell Industries KCT - page 32
28 Krell Current Tunnel 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 ...
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Krell Industries KCT - page 33
Krell Current Tunnel 29 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 ...
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Krell Industries KCT - page 34
30 Krell Current Tunnel 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 ...
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Krell Industries KCT - page 35
Krell Current Tunnel 31 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 ...
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Krell Industries KCT - page 36
32 Krell Current Tunnel 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 mai ...
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Krell Industries KCT - page 37
Krell Current Tunnel 33 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 ...
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Krell Industries KCT - page 38
34 Krell Current Tunnel 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. W ...
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Krell Industries KCT - page 39
Krell Current T unnel 35 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 . The warranty does not apply to damage caused by acts of God or nature. The war ...
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Krell Industries KCT - page 40
36 Krell Current T unnel Return Authorization Procedure 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 . T o expedite service, you may wish to complete and e-mail the Service Request Form in the Service section ...
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Krell Industries KCT - page 41
Krell Current Tunnel 37 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 1 pr. Balanced (XLR) 1 pr. Single-ended (RCA) Tape Loop 1 pr. Single-ended Inputs (RCA), 1 pr. Single-ended Record Outputs (RCA), Buffered, with Pro ...
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Krell Industries KCT - page 42
38 Krell Current Tunnel 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 ...
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Krell Industries KCT - page 43
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Krell Industries KCT - page 44
Krell Industries, Inc. 45 Connair Road Orange, CT 06477-3650 USA TEL 203-799-9954, F AX 203-891-2028 E-MAIL krell@krellonline.com WEBSITE http://www .krellonline.com KCT Krell Current T unnel CAST Preamplifier v 01.0 ...
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