The front power switch on the DS450 must be off to use
the remote turn-on. Front power switch is disabled when
12 volt trigger is energized. The front power switch will not
turn the DS450 off if the 12 volt trigger is energized.
The +12VDC remote jacks have polarity protection, so they
will not operate if a -12VDC signal is accidentally connect-
ed, or if the control wires are reversed.
Operating Procedure
1.
Make sure you have read and followed the INSTALLA-
TION and CONNECTION instructions prior to
attempting operation.
2.
Secure all rear panel connections between DS450, and
input source, and loudspeakers.
3.
Make sure the amplifier is properly connected to a high-
current AC power receptacle via the supplied power cord
(see CONNECTIONS).
4.
Your preamplifier should be “On” and muted and/or set
at minimum gain.
5.
Turn Power switch from “Off ” to “On”. Unit is ready to
play when LED is on.
Note:
if the power indicator LED
fails to light, turn the Power switch to “Off ” and check
the appropriate fuse for possible failure. Extra fuses
for AC power are included with the unit. If green light is
blinking after turn on, a low line voltage condition
exists – turn off amplifier and check line voltage.
6.
Your amplifier should now operate satisfactorily. It may
be played immediately, although best sonic performance
will in most cases not be achieved for an hour or so (see
INSTALLATION for further details.)
Start-Up Following “Protect” Shutdown:
The DS450 amplifier uses a sophisticated, non-fused sens-
ing circuit to protect the amplifier from D C at the input,
from thermal overload, and from shorting conditions at the
output (e.g. defective speaker leads, etc.). This circuit also
helps prevent damage to your loudspeakers.
When the amplifier senses a fault condition in either chan-
nel from excessive D C or excessive output current, it will
automatically shut off left or right outputs from the
amplifier. Amplifier will automatically return to normal
operation when fault is removed.
If the amplifier fails to resume normal operation after
removal of a fault condition, contact your authorized dealer
for further assistance.
Servicing
Because of its careful design and exacting standards of
manufacture, your DS450 amplifier should normally
require only minimal service to maintain its high level
of performance.
CAUTION:
The DS450 amplifier contains sufficient levels
of voltage and current to be
lethal
. Do not tamper with a
component or part inside the unit. Even with the power
turned off, a charge remains in the energy storage capaci-
tors for some time. Refer any needed service to your
authorized Audio Research dealer or other qualified
technician.
Additional questions regarding the operation, maintenance
or servicing of your amplifier may be referred to the Cus-
tomer Service Department of Audio Research Corporation
at 763-577-9700 (CST). When ordering a service manual
from Audio Research or an authorized dealer, be sure to
identify the serial number on your amplifier.
Cleaning
To maintain the new appearance of this unit, occasionally
wipe the front panel and top cover with a soft, damp (not
wet) cloth to remove dust. A mild, non-alkaline soap solu-
tion or dilute isopropyl alcohol may be used to remove
fingerprints or similar smudges. Cleaners containing abra-
sives should
not
be used as they will damage the anodized
finish of the front panel. A small, soft paint brush is effec-
tive in removing dust from bevels, the recessed nameplate
and other features of the front panel.
Disposal and Recycling Guidelines
To dispose of this electronic product, do not place in land-
fill. In accordance with the European Union Waste Electri-
cal and Electronic Equipment (WEEE) directive effective
August 2005, this product may contain regulated materials
which upon disposal require special reuse and recycling
processing.
Please contact your dealer or importing distributor for
instructions on proper disposal of this product in your
country. Or, contact Audio Research Corporation (763-577-
9700) for the name of your importing distributor and how
to contact them.
Packing and shipping materials may be disposed of in a
normal manner.
Model DS450
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