Page 2 - KCT
KCT Krell Current TunnelCAST Preamplifier v 01.0 Krell Industries, Inc. 45 Connair Road Orange, CT 06477-3650 USA TEL 203-799-9954 FAX 203-891-2028 E-MAIL [email protected] WEBSITE http://www.krellonline.com This product is manufactured in the United States of America. Krell ® is a registered tr...
Page 3 - Contents; Page
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 CONNECTI...
Page 4 - continued; List of Illustrations
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 Th...
Page 5 - CONFIGURATIONS
Krell Current Tunnel 1 Introduction Thank you for your purchase of the Krell Current Tunnel (KCT) CAST Preamplifier. TheKCT features Krell Current Tunnel topology and Krell CAST technology, which worktogether to reproduce music with unparalleled sound quality. The KCT has dual zonecapability for lis...
Page 6 - INPUT AND OUTPUT CONNECTIONS
2 Krell Current Tunnel INPUT AND OUTPUT CONNECTIONS BalancedA symmetrical input or output circuit that has equal impedance from both input terminalsto a common ground reference point. The industry standard for professional and soundrecording installations, balanced connections have 6 dB more gain th...
Page 7 - Revolutionary Krell CAST Technology
Krell Current Tunnel 3 Revolutionary Krell CAST Technology Current Audio Signal Transmission, termed CAST, is a revolutionary method ofconnecting analog audio components for unparalleled sonic performance. Innovativeengineering combines the new Krell CAST circuitry with existing Krell Current Modete...
Page 9 - AC POWER GUIDELINES
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 infor...
Page 10 - Quick Start; Connecting the KCT Preamplifier; Important; Operating the KCT Preamplifier; IMPORTANT
6 Krell Current Tunnel Quick Start To access the full array of available features for the KCT preamplifier, please read theentire owner’s reference manual. The abbreviated procedures in this Quick Start sectionwill allow you to connect and operate the KCT quickly and enjoy its basic featuresbefore y...
Page 11 - If you wish to turn your system off:; Turn your system off if it will not be used for a long period of time.
Krell Current Tunnel 7 Use care when setting high playback levels. Always lower the volume level at the firstsign 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)...
Page 12 - Figure 1 The KCT Front Panel
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 Fr...
Page 13 - Front Panel Description; See Figure 1 on page 8; Power; Infrared Transmitter LED; Preamplifier Functions; Tape Button
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, levelcontrol, menu functions, and status display. Front panel features and their descriptionsfollow. Power 1 Power ButtonUse this button to switch the K...
Page 14 - for the negative phase the; Display; and submenu name. See Customizing the KCT
10 Krell Current Tunnel 9 Phase ButtonUse this key to invert the absolute polarity of the variable output 180 degrees for theselected input. The front panel display (13) shows INVERT for the negative phase; the display remains blank for the positive phase. 10 Zone ButtonUse this button to select the...
Page 15 - Figure 2 The KCT Back Panel
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 ...
Page 16 - Back Panel Description; See Figure 2 on page 11; Inputs; The following outputs are for the main zone.; Zone 2 Outputs; The following outputs are for zone 2.
12 Krell Current Tunnel Back Panel Description See Figure 2 on page 11 The KCT preamplifier back panel provides all input and output connections, remotecontrol inputs and outputs, and power connection. Back panel features and theirdescriptions follow. Inputs 17 B-1 and B-2 Left and Right Balanced In...
Page 18 - Figure 3 The KCT Remote Control
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 Functions35 Mute Key36 Phase Key37 Main Zone Key38 Z2 Key39 Input Select Keys40 Tape KeyMenu Functions41 Menu Key42 Enter Key Level Control43 Bal(ance) Key44 Level KeysCompact Disc Functions45 Pause Ke...
Page 19 - Remote Control Description; See Figure 3 on page 14; BATTERY INSTALLATION AND REMOVAL
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 includedwith the shipment. To install the batteries: 1. Remove the remote control backplate, using the supplied T-10 ...
Page 20 - Note; is activated, the front panel display (13) shows the zone that; Menu Functions; Level Control
16 Krell Current Tunnel 37 Main Zone KeyUse this key to select the main zone (the main listening or viewing area). The red mainzone LED (11) on the front panel illuminates when the main zone is activated. 38 Z2 KeyUse this key to select zone 2. The green zone 2 LED (12) illuminates when zone 2 isact...
Page 21 - Compact Disc Functions
Krell Current Tunnel 17 Compact Disc Functions The compact disc keys on the KCT remote control are functional with all Krell compactdisc players. 45 Pause KeyUse this key to temporarily suspend playing the current compact disc track. To resumeplaying the track at the point pause was engaged, press p...
Page 22 - Connecting the KCT Preamplifier to Your System; The XLR pin configuration is described below:; appears in the
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 sonicperformance between the KCT and other CAST-equipped components. The KCT also offers conventional ...
Page 23 - Krell Link Connections and Operation; Connecting Components through Krell Link; MIDI cable is connected.; Krell Link Operation
Krell Current Tunnel 19 Krell Link Connections and Operation Krell Link in/out connectors on the KCT back panel allow you to synchronize remotecontrol operation for systems that include multiple amplifiers and associatedcomponents. When the Krell Link in/out connectors are used, the remote capabilit...
Page 24 - Tape Input and Output; For both tape features, the KCT front panel display (13) shows; changes to; after three seconds.
20 Krell Current Tunnel Tape Input and Output The KCT preamplifier has a discrete tape input and output. The tape output is used tochannel a signal from a C-1, C-2, B-1, B-2, S-1, S-2, or S-3 input to a recording deviceor processor. You can use the tape feature in two ways: 1. Use the tape input to ...
Page 26 - MAIN ZONE AND ZONE 2 OPERATION; Play Both Zones; To turn off this option:; switches you to the main zone.; Main Zone Only; the main zone volume to the desired level.
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 differentdevice through each zone simultaneously, and adjust volume leve...
Page 27 - Zone 2 Only; Play and Record
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 an...
Page 29 - Troubleshooting System Noise
Krell Current Tunnel 25 Troubleshooting System Noise When you mix and match high-performance audio components, each with its ownground potential, a low frequency hum may occur in one or both loudspeakers. If thishappens when you place the KCT preamplifier into your system, follow these simpletrouble...
Page 30 - Customizing the KCT Preamplifier; Z1 AND Z2 BALANCE; and the current balance setting.; To adjust the fixed offset for zone 2:
26 Krell Current Tunnel Customizing the KCT Preamplifier The KCT preamplifier’s easy-to-use menu options allow you to select and set preferredoperating options for balance, inputs, trims, Theater Throughput mode, displaybrightness, mute, trigger setup and delay, tape output, AC mains, remote program...
Page 31 - to the input level trim menu.; INPUT BALANCE TRIM
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 n...
Page 32 - balance of the selected input.
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 f...
Page 33 - BRIGHTNESS; illustrates each level of brightness.; , the front panel display will remain on until you exit the menu mode.; MUTE MENU
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) ...
Page 34 - output trigger setup menu.; TAPE OUTPUT MENU; or
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...
Page 35 - PROGRAM REMOTE MENU; control command options.; INPUT TRIGGER SETUP
Krell Current Tunnel 31 PROGRAM REMOTE MENU This option allows the KCT to send its remote control commands to a learning orprogrammable remote control. NoteYou must place the programmable remote in front of the KCT infrared sensor to sendremote control commands. 1. Press the menu button (15) or key ...
Page 36 - SETUP MEMORY; display shows; KRELL LINK; Following are the definition of terms used with Krell Link.
32 Krell Current Tunnel SETUP MEMORY This option allows you to save or recall new settings, or reset all settings to the factorydefaults. Remember, to exit the setup memory without altering the settings, select exitand press the enter button (16) or key (42). You return to the main menu. 1. Press th...
Page 37 - you wish to configure.; EXIT MENU
Krell Current Tunnel 33 TRIGGER DELAY SETUP This option allows you to customize the number of seconds (from 0 to 5) before a triggeractivates. 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. P...
Page 38 - Questions and Answers; Q. Should I leave my KCT on at all times?
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 modewhen it is not playing music. Turn your system off only if it will not be used for a longperiod of time. Q. When I turn on the KCT...
Page 39 - Warranty
Krell Current Tunnel 35 This Krell product has a limited warranty of five years for parts and labor on circuitry. Shouldthis product fail to perform at any time during the warranty, Krell will repair it at no cost to theowner, except as set forth in this warranty. The warranty does not apply to dama...
Page 40 - To contact the Krell Service Department:
36 Krell Current Tunnel 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 problembefore you return the component for repair. To expedite service, youmay wish to complete and e-mail the S...
Page 41 - Specifications; IEC AC Mains Receptacle
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-e...
Page 42 - Frequency Response
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,...
