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MA Amplifier • Operating Manual
4
Front Panel Features
4.1
Air Vents
Cool air enters in through the amplifier front
and is vented out the rear.
4.2
Channel LED Indicators
CLIP/MUTE (red):
•
CLIPPING is indicated when the speaker
output reaches 95% (-0.5dB) of maximum
power.
MUTE is indicated when front panel level or DC
level controls are fully attenuated.
•
SIGNAL (green) is indicated when amplifier
output voltage reaches 25% (-12dB) of
maximum.
•
CURRENT (green) indicates when the
current to the load is greater than 2 Amps
peak.
•
TEMP (yellow) indicates that automatic
counter-measures are being applied due to
an excessive internal temperature .
4.3
Protect LED
The red protect LED initially turns on to indicate
that real-time countermeasures are being applied
to overpower, over-temperature, or rail voltage
fault conditions while the amp is still running.
If the countermeasures are unsuccessful and
the amplifier protects itself by shutting down,
the protect LED remains on and the amplifier's
power must be cycled before resuming normal
operation.
The exception to this is when the amp shuts
down due to the AC mains voltage being out
of range, in which case the amp automatically
MA500.8 shown
restarts as soon as the AC mains line voltage
returns to the specified operating range.
See the
troubleshooting
LED fault codes.
4.4
Front Disable/Power Share LED
•
4.4a - FRONT PANEL DISABLE - This LED
lights RED when the front panel controls
(power switch and channel attenuators)
are disabled via the back panel DIP
switch.
•
4.4b - POWER SHARE - This LED lights
GREEN when power sharing is enabled via
back panel DIP switch. See section
more information on power sharing.
•
This LED lights AMBER when both Front Panel
Disable and Power Share are engaged.
4.5
Channel Attenuators
These control the level of the amplifier, and work
in combination with the remote DC level controls.
When an input attenuator is turned fully off, the
red Clip/Mute LED for that channel turns on to
indicate mute status. Front panel attenuators and
the power switch can be disabled using the back
panel DIP switch
(sec.
4.6
Power Switch/LED
This switch is used for powering the amplifier
on or off. Its white LED lights solid when the
section for all Protect
amplifier is on and flashes at 1Hz when in
standby mode. The power switch can be
disabled using the back panel DIP switch. The
three possible power switch LED conditions are:
•
Fully lit: The amplifier is powered up, even
if the power switch has been disabled, in
which case the disable LED will be on.
•
Flashing: The amplifier is in standby mode.
•
Fully off: The amplifier is completely off.
5.7d
for
4.7
Bridge LED
This green LED indicates when a channel pair
is set to BRIDGE mode from the back panel
switch
odd numbered input and level control for that
channel pair is used.
4.8
Model Number
The first three numbers of model number
express the power rating per channel of the
amplifier.For example, "500" mean 500W per
channel, "250" means 250W per channel. The
5.7b).
last number is the model's channel count.
(sec.
5.6). In bridge mode, only the
7
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