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FRONT PANEL CONTROLS
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1. Rack Mounting Ears
Two front panel mounting holes are provided on each
mounting ear.
2. Fan Vent
A series amplifiers are cooled by two (except for A 900)
rear-mounted fans. Cool air is flowed through the front
fan filters, reducing the temperature of the inside
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 controls the units main power.
4. Signal Indicators
These green and yellow LED will illuminate to indicate
that a signal is present at the amplifier input, and that
the signal is being amplified.
5. Clip Indicators
These red LED will illuminate at the clipping threshold.
If it lights frequently, you maybe overloading the HPA
Series and a distorted signal is probably being output.
Under heavy clipping activity lower the channel gain
controls to reduce the risk of damage to your speakers
and amplifier.
6. Active Indicators
These blue LED indicate that AC power is
REAR PANEL CONTROLS
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1. Fan
This is a variable speed cooling fan. Cooling air enters
the amplifier through the fan ports located on front of the
amplifier chassis, Be sure not to block these ports when
installing the amplifier or other associated equipment.
2. Input connectors
Connect the input source to these electronic balanced
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connected and the amplifier is turned on.
7. Protect Indicators
These red LED indicate that the channel is in Protect
mode. When the channel goes into protect mode all
output for that channel will turn off by output relay. The
protect LED will light when overheating or other
severe problem occur. This is to protect any speakers
connected to the channel. These LED light for
approximately five seconds whenever the A Series is
powered on and to fade slowly when the amplifier is
powered off. It is normal.
8. Channel input level control
These two 21-position detented controls adjust input
level for their respective amplifier channels. In
Bridged Mono Mode, only channel 1 input 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
counterclockwiseposition, 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 A Series
delivers full power output.
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Combination connectors using either XLR or 1/4" TRS
plugs. The 1/4" TRS and XLR plug configured as follows:
Pin 2 (Tip) hot, Pin 3 (Ring) cold, and Pin 1 (Sleeve)
ground. We recommend the use of balanced three-
conductor cabling wherever possible. Unbalanced two-
conductor 1/4" plugs can also be inserted into these
inputs, but you will get better signal quality and less
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