Krell KRC-HR Owners manual
Leader in Audio Engineering
KRC-HR
PREAMPLIFIER
OWNER’S REFERENCE
TABLE OF CONTENTS
2
INTRODUCTION
UNPACKING
3
4
THEATER-THROUGHPUT SETUP
5
BASIC INSTALLATION
6
INPUT/OUTPUT CONNECTIONS
REAR PANEL DESCRIPTION
7
8
BASIC PREAMPLIFIER OPERATION
9
FRONT PANEL DESCRIPTION
11
15
10
12
14
REMOTE CONTROL
PROTECTION CIRCUITRY INDICATORS
QUESTIONS AND ANSWERS
SPECIFICATIONS
WARRANTY AND SERVICE
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 RESOLUTION due 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-HR for 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-HR and 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-HR a 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
KRELL staff for assistance.
In the unlikely event that your KRC-HR requires 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 KRELL Dealer or
Distributor.
2
UNPACKING
i. Open the box and remove the top layer of foam.
2. Remove the KRC-HR and the foam tray surrounding it. The following items
will now be visible:
1 KRC-HR power supply
1 KRC-HR remote control
1 8 ft. DC power 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. Remove from 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-HR in the future,
repack the unit with the power supply and remote control in its original packing
to prevent damage in 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-HR must 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.
SETTING THE $4 INPUT FOR THROUGHPUT FUNCTIONS
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-HR and insert the cover screws.
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4
BASIC INSTALLATION
1. Place the unit on a firm level surface free from excessive dirt or moisture.
The KRC-HR is 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. DO NOT
PLUG THE POWER SUPPLY INTO THE AC OUTLET AT THIS TIME.
Connect the female end of the DC power cable to the computer-type
3.
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 AC cord into the receptacle on the back of the power supply. Plug
the remaining end into the wall AC receptacle.
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 AC strips are acceptable.
5. When the KRC-HR power 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 LEDs on the KRC-HR will 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
CIRCUITRY section of this manual for more information.
6. The power-up sequence lasts about 15 seconds. Once completed, the
KRC-HR can be operated from the front panel or the remote control.
5
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