FRONT PANEL CONTROLS
1. Rack Ears
These ears are used to mount the amplifier in any standard 19”
rack.
2. Fan Vent
The A-Series amplifiers are cooled by two rear-mounted fans
(except for A.900 which is cooled by a single rear mounted fan).
Cool air flows through the front fan filters, reducing the tempera-
ture internal components while forcing the heat out the rear vents.
Never block these vents and keep them clean at all time.
3. AC Power Switch
This switch powers the unit on and off.
4. Signal Indicators
These blue LED's will illuminate to indicate that a signal is pres-
ent at the amplifier input, and that the signal is being amplified.
5. Clip Indicators
These red LED's will illuminate at the clipping threshold. These
lights should not light up during normal use as they indicate sig-
nal outside of the amplification range of the amplifier. When a sig
-
nal is "clipped" and the clip indicator illuminates, it means that the
signal is being distorted at the output stage. Prolonged clipping
can not only damage your amplifier, but also your speakers, so be
careful to monitor the clip indicator during setup and use. If the
clip indicator is illuminated then simply lower the channel gain or
input signal until the indicator does not light.
6. Active Indicators
These blue LED's indicate that AC power is connected and the
amplifier is turned on.
7. Protect Indicators
These red LED's indicate that the channel is in Protect mode.
When the channel goes into protect mode all output for that chan-
nel will be muted. The protect LED's light when overheating or
other severe problems occur. This is to protect any speakers con-
nected to the channel. The LED's also light for approximately five
seconds whenever the unit is powered on and fade slowly when
the amplifier is powered off.
8. Channel input level control
These two 21-position detented potentiometers adjust input level
for their respective amplifier channels. In Bridged Mono Mode,
only channel 1 level control are used to adjust signal level. In
Parallel Mode, both input level control are used to adjust signal
level for their respective amplifier channels. At their fully counter-
clockwise position, the signal is attenuated by more than 80dB. At
their fully clockwise position, the signal is at unity gain. When 0
dBu of signal arrives at the input jacks and the Channel input level
controls are set to their fully clockwise position, the unit delivers
full power output.
(4 pages)
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