Krell Reference 64 Owners manual
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REFERENCE 64
OWNER’S REFERENCE
INTRODUCTION
Thank you for your purchase of the Krell REFERENCE 64
Digital-to-Analog Processor and welcome to the Krell family of
audio components. Krell is dedicated to the development of
technologically advanced components for the reproduction of
digitally recorded music. The REFERENCE 64 redefines excellence in the Krell tradition of uncompromising performance
through leading-edge technology.
The REFERENCE 64 is designed to sound wonderful, but to
look and function as a world-class, reference-caliber component. The REFERENCE 64 utilizes all proprietary Krell cir-
cuitry. The digital input is decoded by the Krell Data Recovery
and Jitter Rejection Module, virtually eliminating jitter and
associated clocking errors. To further reduce the potential of
clocking errors, the TimeSync linking system allows the
REFERENCE 64 to lock and operate with the CD transport’s
clock output. The data signal is run through four serial
Motorola DSP-56001 processors (two per channel, in series)
running Krell written software contained within socketed
EPROMs. This method allows for simple installation of future
software updates. Within the digital section, data is
oversampled 64 times. Data then goes through Krell’s own
custom DAC modules. After conversion is complete, signal is
passed through the DC coupled, discrete, complementary
Class A output stage. The REFERENCE 64 utilizes separate
highly regulated power supplies containing three 50VA toroidal
transformers. All power supply circuitry is housed in a sepa-
rate chassis, and mechanically linked to ensure proper thermal stability. Each digital input in the REFERENCE 64 has its
own selection button and direct~ path to the processing stages.
Assembly of this product is second to none. Every section is
assembled within rigid quality control standards. The REFERENCE 64 is a pleasure to use and will bring many years of
listening fulfillment.
PAGE 2
INTRODUCTION
This Owner’s Reference is designed to ensure the clear, trouble
free installation of your REFERENCE 64 processor. Basic In-
stallation, Operation and Quea{ion and Answer sections are
provided. Should you have any questions or comments, please
feel free to contact your authorized dealer or the KRELL staff
for assistance.
In the unlikely event that your REFERENCE 64 should require
service, you will be pleased to know that it is backed by a com-
prehensive 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
the Warranty and Service section of this Reference, Warranty
Registration Card, or an authorized KRELL Dealer/Distributor.
PAGE 3
TABLE OF CONTENTS
5 UNPACKING INSTRUCTIONS
6 ASSEMBLY INSTRUCTIONS
8 PLACEMENT
9
10
19
21
23
26 SPECIFICATIONS
27
AC POWER CONSIDERATIONS
INPUT AND OUTPUT CONNECTIONS
PROCESSOR OPERATION
OPERATING INSTRUCTIONS
QUESTIONS AND ANSWERS
WARRANTY AND SERVICE INFORMATION
PAGE 4
UNPACKING
1. Open the box and remove the top layer of foam. The following
items will now be visible:
1
1 REFERENCE 64 Power Supply
1 Power Coupler
1 AC power cord
1 AT&T cable (1 mtr)
1 Packet containing the Owner’s Reference and Warranty
NOTE: If any of these items are not included, please contact your
authorized dealer immediately for assistance.
2. Carefully remove the Processor, Power Supply and accessories
from the box. Remove the protective plastic wrap from the
Processor and Power Supply.
NOTE: Save all packing materials. If you must ship your
REFERENCE 64 in the future, repack the unit in its original
REFERENCE 64 D/A PrOcessor
Card
packaging to prevent transit damage.
PAGE 5
ASSEMBLY
ASSEMBLY INSTRUCTIONS
1. The processor is designed to sit directly on top of its companion
Power Supply. There is a mechanical interlock built into the front
feet of the processor and the chassis cover of the Power Supply.
The units are secured together in the rear by the power coupler.
2. Place the Power Supply on a clear work surface. Notice the
locking shoes at the front top of the Power Supply cover and the
lock pins at the rear top of the Power Supply cover.
3. Locate the Processor main unit. Carefully turn the unit over
to expose the chassis feet. Observe the design of the feet. The feet
have been carefully designed to slide into the shoes on the front
top of the Power Supply cover. The rear feet on the processor unit
fit directly over the pins protruding on the rear top of the Power
Supply cover. The rear feet are self-centering over the rear
protruding pins on the Power Supply cover.
4. Face the front of the Power Supply. Holding the front of the
Processor with both hands and the faceplate of the Processor
facing you, tilt the rear of the processor unit up and slide the unit
into the shoes on the top of the Power Supply cover. Once the feet
are in the cover shoes, gently set the rear of the processor down
on the Power Supply. The self-centering feet should center
themselves directly over the pins on the rear section of the Power
Supply cover.
PAGE 6
ASSEMBLY
5. Locate the Processor/ Power Supply coupler assembly. This
assembly can only be installed in one direction. The wider portion
of the assembly with the mal~ connectors goes into the female
connectors inthe center of the Power Supply. The female connec-
tors on the power coupler go into the Processor’s male connectors.
Once the coupler has been firmly pressed into place; secure it,
utilizing the four thumb screws provided. When properly seated,
the coupler edges should be parallel with the rear and top panels
of the supply and Processor chassis.
CAUTION: Do not attempt to operate the unit before inserting and
tightening the four floating screws to the chassis. Failure to do so
can cause damage to the unit.
’PAGE 7
PLACEMENT
PLACEMENT
Before you install the REFERENCE 64 into your system, we
recommend that you follow these guidelines in choosing the
location. This will facilitate a clean, trouble-free installation.
1. Although well shielded, the Processor should not be placed in
close proximity to hum-sensitive components (ioe. preamps,
turntables, tuners, etc.) that can create interference and induce
hum.
2. As with any high quality component, ensure that the vent
openings in the chassis are free from obstruction, allowing the
Processor to dissipate heat created by its Power Supply and Class
A output stage. Place the unit on a clean, level surface away from
excessive dirt or moisture. Make sure the REFERENCE 64 has at
least 2 inches of clearance on either side and 2-3 inches of space
at the top. Components that are heat sensitive should not sit
directly above the unit.
3. The REFERENCE 64 does not require additional mass coupling
or isolation. You may experiment with feet or cones as long as they
do not permanently affix to the chassis. Any unauthorized
modifications to the electronics or chassis will void the warranty.
PAGE 8
AC POWER
AC POWER CONSIDERATIONS
NOTE: While the REFERENCE 64 has superb regulation and does
not require a dedicated AC Circuit, we strongly advise against
connections through extension cords or multiple AC adaptors.
High quality 15 amp grounded AC strips are acceptable. High
quality AC line conditioners or filters can be utilized if they are
grounded and meet or exceed the unit’s Power Supply rating of
300VA.
CAUTION: Do not remove or bypass the ground pin on the end
of the AC cord. This may cause RFI (radio frequency interference)
to be induced into your playback system.
PAGE 9
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