Rear Panel Features; Audio Inputs; Remote Vca Control; High Pass Filter - Ashly MA Series Operating Manual

MA Amplifier • Operating Manual
5

Rear Panel Features

5.1

Audio Inputs

Balanced Input
Euroblock connectors
(3.5mm) are used for
wiring input signals.
If using unbalanced
(single-ended)
inputs, connect
the signal wire to the (+)input pin, connect the
shield wire to the (-) input pin, and optionally
use a piece of wire to link between the (-) input
pin and the G pin.
5.2 Remote VCA Level Control Input
Every input channel has a
potentiometer circuit available
for remote DC level control of
that channel. The illustration to
the right shows proper wiring
per channel. Shielded wire is not
required, and there is no limit to
wire length. Do not use any other
ground source. If multiple remote DC level controls
are used for different channels, the same ground
and V+ sources can be shared.
5.3 High Pass Filter DIP Switch
An 80Hz 2nd order hipass filter is independently
available on every channel to reduce low
frequency content going to a speaker.
5.4 Clip Limiter DIP Switch
The clip limiter prevents an amplifier channel
from sending clipped audio to the speaker.
When the clip limiter is enabled, input signal
level is automatically attenuated whenever the
full rated output power is exceeded.
5.5 Output Mode DIP Switch

Output mode

for amplifier
channels can be
set as shown for
low impedance,
25V, 70V, or
100V output
using the pair of
DIP switches assigned to each channel.
5.6 Bridge Mode DIP Switch
This switch places the indicated
channel pair into bridge mode,
combining two amplifier outputs
for more power to a single speaker
load. Bridge mode uses only the odd
numbered input and level control,
disabling the even numbered input
and level control for that channel
pair. Speaker outputs in bridge
mode must be wired differently, as
shown on the back of the amplifier
and in section 5.11.
5.7 Utility DIP Switch Functions:
5.7a

Standby Polarity

The Standby Polarity DIP
switch sets the polarity
requirement for placing the
amplifier into standby using
the STBY contact closure
connector. When standby
polarity switch is set to N/O
(DOWN - normally open), the
amp goes into standby whenever the
STBY to GND circuit is closed. When
standby polarity is set to UP, or N/C
(normally closed), the amp goes into
standby whenever the STBY to GND
circuit is open.
5.7b

Front Panel Disable

The Front Panel Disable
DIP switch de-activates all
front panel level controls
and power switch when
in the UP position. NOTE:
Disabling the front panel
controls does not disable
the VCA remote DC level
controls.
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