Leader in Audio Engineering KRC-HR PREAMPLIFIER OWNER’S REFERENCE
TABLE 2 INTRODUCTION 3 UNPACKING 4 THEATER-THROUGHPUT SETUP 5 BASIC INSTALLATION 6 INPUT/OUTPUT 7 REAR PANEL DESCRIPTION 8 BASIC PREAMPLIFIER OPERATION 9 FRONT PANEL DESCRIPTION CONNECTIONS 10 REMOTE CONTROL 11 PROTECTION CIRCUITRY INDICATORS 12 QUESTIONS AND ANSWERS 14 SPECIFICATIONS 15 WARRANTY AND SERVICE OF CONTENTS
INTRODUCTION Thank you for your purchase of the KRELL KRC-HR remote control preamplifier. The KRC-HR combines refinements of the original KRC with a radical approach to volume control circuitry. The HR designation signifies HIGHEST RESOLUTIONdue to the substantial improvement in sonic quality provided by our most sophisticated electronic volume control. The unit also has a Theater-Throughput, which allows easy installation of the unit within a home theater system.
UNPACKING i. Open the box and remove the top layer 2. Remove the KRC-HRand the foam tray will now be visible: 1 1 1 1 1 1 KRC-HR power KRC-HR remote 8 ft. DC power T- 10 torx (for T-15 torx AC power cord of foam. surrounding it. The following items supply control cable remote) If any of these items are not included, immediately for assistance. please 3. Remove from the plastic bags, the preamplifier, and power supply cable connectors.
THEATER-THROUGHPUT SETUP NOTE: If the KRC-HRmust be handled after the top cover has been removed, the unit must be held only on the sides of the chassis. Never move the KRC-HR while the top cover is off by holding the front panel. When reinstalling the top cover, insert the four screws into the chassis sides first and lightly tighten them. Install the screws in the top surface and tighten them lightly. Then tighten all screws firmly, starting with the side screws and finishing with the top screws.
BASIC INSTALLATION 1. Place the unit on a firm level surface free from excessive dirt or moisture. The KRC-HRis not particularly hum sensitive, allowing other components to be placed on or around it. If the optional phono card is installed in the KRC-HR, some components such as Digital to Analog converters, power supplies or components with motors can induce hum into the phono stage. 2. Place the power supply in a location away from hum sensitive components such as turntables or phonostages.
INPUT AND OUTPUT CONNECTIONS CAUTIONS: When making connections to this component or any other, make sure that the power amplifier is OFF. Make sure all cable terminations are of the highest quality, free from frayed ends, shorts or cold solder joints. 1. Connect the left and right inputs of your source equipment to the inputs the KRC-HR. The KRC-HR is equipped with 4 single-ended inputs, balanced capable inputs and 1 single-ended tape input. on 2 2.
REAR INPUTS Four single-ended inputs via standard RCA connectors PH (Line level input if phono board is not installed) S-2 S-3 S-4 Two balanced B-1 B-2 Tape input inputs via standard via standard XLR connectors RCA connectors MAIN OUTPUTS Single ended RCA output connectors Balanced XLR output connectors Balanced XLRoutput pin configuration: Pin 1 Pin 2 Pin 3 Shield (ground) Non-inverting (hot) Inverting TAPE OUTPUT Record output via RCA connectors 7 PANEL DESCRIPTION
BASIC PREAMPLIFIER OPERATION The KRC-HRhas the flexibility of a remote controlled device but does not require special attention in order to perform simple functions. The KRC-HRwill function much like. other KRELLpreamplifiers. The unit can be operated from the front panel controls or via the remote control. All functions available on the front panel can also be accomplished from the KRC-HRremote control.
FRONT PANEL DESCRIPTION INPUT SELECTION PH S-2 S-3 S-4 B-1 B-2 Selects phono input (line not installed) Selects S-2 input Selects S-3 input Selects S-4 input Selects B- 1 input Selects B-2 input level input when phono board FUNCTIONS TAPE Selects tape input and allows monitoring of tape return PHASE Inverts absolute polarity of the main output 180 degrees LED illuminates when polarity is reversed GAIN Low 6dB, High 12dB.
REMOTE CONTROL 1. When a function button on the remote control is pressed and held, the blue pilot LED will flash on the KRC-HR. When the button is released, the flashing stops. This indicates that the KRC-HRhas received a command. 2. The functions of the remote control are identical to the front panel functions. BATTERY INSTALLATION Batteries should be replaced control become intermittent. when the KRC-HR functions 1. Remove the four hex head screws from the back of the control, torx supplied. 2.
PROTECTION CIRCUITRY The KRC-HRis the first high-end preamplifier to have protection circuitry at the input and output. The indicators on the KRC-HR, which are described below, will give you a general location of a problem in your audio system. 1. When the KRC-HR’s monitoring circuitry recognizes excessive DC levels at one of the inputs, the output disconnects from the front-end circuits and the LED corresponding to that input will flash repeatedly until the problem is removed.
QUESTIONS AND ANSWERS Q. When I turn up the volume on the KRC-HR, a loud hum is present loudspeakers. What could this be? Ao from the Hum can be caused by several different disturbances. Check to make sure that all of the cables, (in and out of the KRC-HR) are sound and making proper contact. Make sure that there are no power supplies or hum inducing components on top of or directly below the KRC-HR. You could also be experiencing a ground loop in the system.
Q. Why do I have to turn listening level? Ao up the volume so high to get music at a normal If your system does not seem to have enough gain, you are probably not using the balanced input and output capabilities of the KRC-HR. Each balanced termination has 6dB more gain than a single-ended termination. More important, however, is that the balanced lines provide superior sonic quality. If you must use single-ended terminations, use the High gain setting, which has 6dB more gain than the Low position. Q.
SPECIFICATIONS GAIN: 6dB or 12dB SIGNAL TO NOISE: 96dB unweighted THD: 1KHz less than .01% 20KHz less than .01% INPUT IMPEDANCE: 47,000 Ohms (47K Ohm) OUTPUT IMPEDANCE: 5 Ohms OUTPUT VOLTAGE: 14 volts R.M.S. DIMENSIONS: Unit: 19.0" Wide 14.5" Deep 2.75" High, with feet Power Supply: 1 1" Wide 9" Deep 2.5" High All operational features, functions, and specifications without notification.
WARRANTY THERE ARE NO USER-SERVICEABLE PARTS INSIDE AND SERVICE ANY KRELL PRODUCT. The KRELLKRC-HRhas a limited and transferable warranty of five years for parts and labor. The warranty period begins on the date of retail purchase, as noted on the retail sales slip provided by an authorized KRELL Dealer or Distributor, or on the warranty registration card sent to KRELL.
WARRANTY AND SERVICE KRELLis not responsible for any damage to units incurred in transit. If any shipping damages are incurred during transit of your units to the factory, you must initiate filing of the insurance claim. Likewise, KRELLwill file claims for shipping damages incurred during transit of your units from the factory to you. The use of any packing material other than original is not recommended. KRELL may, at its discretion, pack a unit in new material for the return shipment.
KRELL 45 Connair Road ¯ Orange, CT 06477-3650 USA 203-799-9954 ¯ Fax: 203-799-9796 ©1997by Krell ® Industries, Inc. All rights reserved.
