Audio Research DS225 Owner's manual - page 6
It is normal for the DS225 power amplifier to run
lightly to moderately warm to the touch. All compo-
nents within are operated at safe, conservative lev-
els and will not be improperly affected, providing
the requirements outlined above are adhered to.
Remote Turn-on Connections
The DS225 has a built-in 12VDC remote turn-on/off
circuit for operation by a master control system in a
home theater or large audio system. Use a 3.5mm
(.140") diameter mini plug to connect to the +12V IN
jack on the rear of the DS225. Two identical paral-
leled jacks are provided to allow chaining connec-
tions to control two or more DS225s or other equip-
ment.
The +12V IN jack should be connected to the
+12VDC output of the master control system, using
a continuous +12VDC signal at 20mA per DS225 for
the duration of amplifier on-time. Do not use a mo-
mentary or data pulse control signal.
The front power switch on the DS225 must be off to
use the remote turn-on. Front power switch is dis-
abled when 12 volt trigger is energized. The front
power switch will not turn the DS225 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 acci-
dentally connected, or if the control wires are
reversed.
Operating Procedure
1. Make sure you have read and followed the IN-
STALLATION and CONNECTION instructions
prior to attempting operation.
2. Secure all rear panel connections between
DS225, and input source, and loudspeakers.
3. Make sure the amplifier is properly connected to
a high-current AC power receptacle via the sup-
plied 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 pos-
sible failure. Extra fuses for AC power are includ-
ed 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 son-
ic performance will in most cases not be achieved
for an hour or so (see INSTALLATION for further
details.)
Start-Up Following “ Protect ”
Shutdown:
The DS225 amplifier uses a sophisticated, non-fused
sensing 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
channel from excessive D C or excessive output cur-
rent, it will automatically shut off left or right outputs
from the amplifier. Amplifier will automatically re-
turn to normal operation when fault is removed.
If the amplifier fails to resume normal operation af-
ter removal of a fault condition, contact your autho-
rized dealer for further assistance.
Servicing
Because of its careful design and exacting stan-
dards of manufacture, your DS225 amplifier should
normally require only minimal service to maintain its
high level of performance.
CAUTION: The DS225 amplifier contains sufficient
levels of voltage and current to be
let hal. Do not
tamper with a component or part inside the unit.
Even with the power turned off, a charge remains in
the energy storage capacitors for some time. Refer
any needed service to your authorized Audio
Research dealer or other qualified technician.
Additional questions regarding the operation, main-
tenance or servicing of your amplifier may be re-
ferred to the Customer 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.
Model DS225
3