User Guide
6
A-2000 7 Channel Amplier
Instruction Manual
7
Power Control Connections
The Model A-2000 features a built-in remote turn-on system that will auto-
matically switch the amplier on when a connected device in the system is
switched on.
Remote Turn-On Using Products Equipped With a Low
Voltage Trigger Jack
Press the front panel power switch on the amplier so that it is in the ON
position. Then, using an accessory cable with a 3.5mm mono mini-plug on
each end, connect the trigger-output jack on the rear of the source device to
the trigger input jack on the back panel of the amplier. When these con-
nections are made, the amplier will automatically turn on whenever the
triggering device is turned on.
Remote Turn on Using External AC to DC Power Converter
If your processor or receiver does not have a dedicated trigger jack, it is still
possible to activate the unit for automatic turn on when a Switched Outlet
is available on the rear of the source device. To control the amplier in this
fashion you will need a small AC to DC power converter, capable of deliver-
ing a 6 to 12 volt DC signal. The DC voltage should terminate in a standard
3.5mm type mini plug. This type of converter may be obtained as a Power
Adapter from many electronics retailers, or may be obtained at Radio Shack
stores as catalog number 273-1758.
When installing, plug the AC adapter into a switched outlet that will be acti-
vated when you wish to have the amplier turn on. This may be the switched
outlet at the rear of an AC receiver or other audio equipment. Connect the
3.5mm mini-plug from the adapter to the trigger-input jack on the back
panel of the amplier. Press the Main Power Switch on the front panel of the
amplier in so that it is in the ON position. The amplier will now turn on
and off automatically, based on the status of the controlling device.
Power Connection
Once all audio and system connections have been made, connect the sup-
plied power cord (or an equivalent cord of equal or heavier gauge) to the
amplier rst, and then connect it to an AC power source. Please make
certain that the amplier is turned off and that the device connected to the
remote trigger input is off when connecting the power cord and plugging
it into an AC outlet.
CAUTION:
Do not plug the amplier directly into the “Switched
Accessory” outlet of another device! These outlets are intended for
use with low current draw products, such as tuners, CD players or
cassette decks. These outlets cannot safely supply the high current
required by a power amplier like the A-2000. Using switched outlets
like these for a power amplier poses a signicant safety hazard.
IMPORTANT NOTE:
It is also not recommended that you connect
other power ampliers or products with a high current draw, to the
same AC power circuit as the amplier, unless they are used with the
remote power turn on and some sort of power on sequencing system.
The simultaneous turn-on of multiple ampliers on the same circuit
may cause circuit breakers to trip, due to the high current draw.
Amplier Operation
After all connections have been made you are ready for listening. First, with
the processor’s volume control all the way down, turn on the source compo-
nents and processor in your system. It is always a good idea to turn on your
amplier LAST. This avoids the possibility of any turn on pops or transients
from other equipment being amplied and sent to your speakers where they
may cause damage. Be sure to always start with a low volume level on your
controller or preamp to avoid damage to your speakers.
Manual On
Simply press in the front panel power switch until the light is illuminated.
There will be a short pause from the time the power is turned on until power
is applied to the speakers. This is intentional, and protects your speakers
from damage while the amplier stabilizes. You may also hear a relay click
during start up. This is also normal. To turn the unit off, switch the power
switch to the off position.
Output Settings
All volume and level adjustments are made at your preamp, controller or
surround processor. To assure proper sound eld imaging, you should re-set
the output levels of the channels on your processor when using the amplier
for the rst time. The circuitry in your new amplier may be different from
your previous one, and checking the output levels will make certain that the
processor, amplier and speakers are properly matched.
Care and Maintenance
Cleaning
If the unit becomes dirty, wipe it with a clean, soft, dry cloth. If necessary,
rst wipe the surface with a soft cloth slightly dampened with mild soapy
water, then with a fresh cloth slightly dampened with clean water. Wipe dry
immediately with a dry cloth. NEVER use benzene, thinner, alcohol or any
other volatile cleaning agent. Do not use abrasive cleaners, as they may dam-
age the nish of the metal parts. Avoid spraying insecticide, waxes, polishing
agents, or any aerosol product near the unit.
When You Are Away
If you will not be using your home theater system for an extended period
of time, it is always a good idea to disconnect all associated units from the
AC wall current.
Amplier Operation