Krell Industries KRC-HR Quick start guide

Leader in Audio Engineering

KRC-HR

PREAMPLIFIER

OWNER’S REFERENCE

TABLE OF CONTENTS

INTRODUCTION

UNPACKING

THEATER-THROUGHPUT SETUP

BASIC INSTALLATION

INPUT/OUTPUT CONNECTIONS

REAR PANEL DESCRIPTION

BASIC PREAMPLIFIER OPERATION

FRONT PANEL DESCRIPTION

REMOTE CONTROL

PROTECTION CIRCUITRY INDICATORS

QUESTIONS AND ANSWERS

SPECIFICATIONS

WARRANTYAND SERVICE

INTRODUCTION

Thank you for your purchase of the KRELL KRC-HR remote control

preamplifier. The KRC-HRcombines refinements of the original KRCwith a

radical approach to volume control circuitry. The HRdesignation signifies

HIGHESTRESOLUTIONdue 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. Please see page 4 for details on setting the KRC-HRfor the

Theater Throughput function prior to installation.

To obtain the best performance from your KRC-HR,careful attention should be

paid to its placement, installation and operation. A thorough understanding of

these details will help insure satisfactory operation and a long life for the

KRC-HRand related system components.

This Owner’s Reference is divided into several sections, each designed to

perform a different function. As you read through the Owner’s Reference you

will become better acquainted with the features and functions that make the

KRC-HRa superb value. A Question and Answer section is included where

answers to common questions are provided. If you have any questions or

suggestions, please do not hesitate to contact your authorized dealer or the

KRELLstaff for assistance.

In the unlikely event that your KRC-HRrequires service, you will be pleased to

know that it is backed by a comprehensive Customer Satisfaction policy and

one of the most advanced service facilities in the industry. For detailed

information on the terms and conditions of service, please consult your

warranty registration card, or contact your authorized KRELLDealer or

Distributor.

UNPACKING

i. Open the box and remove the top layer of foam.

2. Remove the KRC-HRand the foam tray surrounding it. The following items

will nowbe visible:

1 KRC-HR power supply

1 KRC-HRremote control

1 8 ft. DCpower cable

1 T- 10 torx (for remote)

1 T-15 torx

1 AC power cord

If any of these items are not included, please contact your authorized dealer

immediately for assistance.

3. Removefrom the plastic bags, the preamplifier, power supply, remote control

and power supply cable connectors.

NOTE:Save all packing materials. If you must ship your KRC-HRin the future,

repack the unit with the power supply and remote control in its original packing

to prevent damagein transit.

CAUTION: Do not connect the power cord from the power supply into the AC

mains before completing the "Installation" section.

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.

Whenreinstalling 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.

SETTING THE $4 INPUT FOR THROUGHPUTFUNCTIONS

This procedure should be done with the unit OFF.

a. Remove the KRC-HR top cover screws with the T-15 Torx wrench

supplied.

b. Locate the switch towards the front of the board that is labeled S4/Proc.

Set the dip switch to the proc (processor) position.

NOTE: The default position of this switch sets the $4 input for standard

operation. In this position, $4 is identical to the S1, $2 and $3 inputs.

c. Place the top cover back on the KRC-HRand insert the cover screws.

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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. Connect the male end of the DC power

cable into the computer-type connector on the back of the supply. DONOT

PLUG THE POWERSUPPLY INTO THE AC OUTLET AT THIS TIME.

3. Connect the female end of the DC power cable to the computer-type

connector on the back of the KRC-HR.

CAUTION: ALWAYS CONNECT THE DC CABLE TO THE BACK OF THE

KRC-HR AND TO THE POWER SUPPLY BEFORE YOU PLUG THE POWER

SUPPLY INTO THE WALL OUTLET. FAILURE TO FOLLOW THE

CONNECTION SEQUENCE WILL CAUSE DAMAGE TO THE KRC-HR.

4. Plug the ACcord into the receptacle on the back of the power supply. Plug

the remaining end into the wall ACreceptacle.

NOTE: While the KRC-HR has superb regulation and does not require a

dedicated AC circuit, we strongly advise against any connections through

extension cords or multiple AC adaptors. High quality 15 amp line

conditioners or grounded ACstrips are acceptable.

5. When the KRC-HRpower supply is plugged into the wall AC outlet the

preamplifier will go through its power-up sequence:

a. The volume control will automatically rotate to the Off position, fully

counterclockwise.

b. The Select section LEDson the KRC-HRwill remain unlit until an input or

function is selected.

c. The Protection relays will open once the monitoring circuits have

determined there are no input or output disturbances. See the PROTECTION

CIRCUITRYsection of this manual for more information.

6. The power-up sequence lasts about 15 seconds. Once completed, the

KRC-HRcan be operated from the front panel or the remote control.

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 on

the KRC-HR. The KRC-HR is equipped with 4 single-ended inputs, 2

balanced capable inputs and 1 single-ended tape input.

2. If the optional phono card is included in your KRC-HR,the turntable’s phono

leads will be connected to the PH input. If the phono card is not in the

KRC-HR,the PH input remains a standard line-level input.

3. If the Theater-Throughput option is to be used, connect the Main L/R

outputs of the A/V surround processor to the $4 input.

When $4 is selected, the KRC-HRwill act as a unity gain throughput, (no

change in level), for this input. All control of level will now be

performed by the A/V surround processor.

4. Connect the main output of the KRC-HRto the input of your power amplifier.

The KRC-HRhas both balanced outputs via XLR connectors and single-

ended outputs via RCAconnectors.

The pin assignment for the XLRinputs and outputs are:

Pin 1 Shield (ground)

Pin 2 Non-inverting (hot)

Pin 3 Inverting

The RCAcenter conductor for each channel is wired in parallel with pin 2. Only

one of the preamp outputs should be connected to an individual amplifier. They

can be used simultaneously to drive amplifiers in two different systems.

When connecting inputs or outputs to the KRC-HR, remember that the

balanced connections will have 6dB more gain than the single-ended

connections. Whenlevel matching is critical in your installation, keep this

specification in mind.

REAR PANEL DESCRIPTION

INPUTS

Four single-ended inputs via standard RCAconnectors

PH(Line level input if phono board is not installed)

S-2

S-3

S-4

Two balanced inputs via standard XLRconnectors

B-1

B-2

Tape input via standard RCAconnectors

MAIN OUTPUTS

Single ended RCAoutput connectors

Balanced XLRoutput connectors

Balanced XLRoutput pin configuration:

Pin 1 Shield (ground)

Pin 2 Non-inverting (hot)

Pin 3 Inverting

TAPE OUTPUT

Record output via RCAconnectors

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. This

provides the ability to sit in your favorite listening position while controlling all

system start-up preamplifier functions.

1. Press the Mute button on the KRC-HR.

2. Turn the volume control fully counterclockwise to the OFFposition.

3. Turn the power amplifier ON.

4. Choose a listening source and select that input by pushing the

corresponding input button on the KRC-HR.

5. Start play of the source.

6. Turn the volume control clockwise until you reach a comfortable listening

level.

7. When changing sources, return to the Mute position and/or lower the

volume. This insures that the next source you play will not be potentially

damaging to your system with a high output level.

THEATER THROUGHPUT

The $4 input of the KRC-HRcan be set to operate as a unity gain stage. This

removes the KRC-HRvolume control from the signal path. Volume control is

then transferred from the KRC-HRto an A/V surround processor connected to

the $4 input. This feature greatly simplifies the installation of a surround-

sound processor into a high performance audio/video surround system.

If the Theater-Throughput option is activated, select S-4 when your home

theater/surround system will be used. In this mode, all control of volume is

performed by the A/V surround processor connected to that input. Specifically,

Level, Balance and Gain are disabled on the KRC-HRfor the S-4 input only

when the Theater-Throughput is engaged. Mute and Tape (monitor input) will

function normally.

FRONT PANEL DESCRIPTION

INPUT SELECTION

S-2

S-3

S-4

B-1

B-2

Selects phono input (line level input when phono board

not installed)

Selects S-2 input

Selects S-3 input

Selects S-4 input

Selects B- 1 input

Selects B-2 input

FUNCTIONS

TAPE

PHASE

GAIN

MUTE

L BALANCE

R BALANCE

VOLUME

Selects tape input and allows monitoring of tape return

Inverts absolute polarity of the main output 180 degrees

LEDilluminates when polarity is reversed

Low6dB, High 12dB. LEDilluminates in High position

No signal output when LEDis on

Left channel attenuation in 1 dB increments and OFF

Right channel attenuation in 1 dB increments and OFF

Stepmotor driven optical encoder

Table of contents

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