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AMB SERIES AUDIO POWER AMPLIFIERS INSTALLATION AND OPERATION MANUAL
CONTROLS, CONNECTORS & INDICATORS
FRONT PANEL
The AMB Series differ only slightly across all models and all share the same
features on their front panels.
The functions of the controls and indicators are as follows:
1
Power Switch
Press the switch to down for power on and up for power off. At start-up
(turn-on), the input to the amplifier is muted for approximately two seconds.
2
On Indicator
The LED will illuminate and indicates that the amplifier is on and receiving
mains power.
3
Protection Indicator
This red LED indicates a problem with the amplifier or that it has over heated.
In the advent of a thermal overload, the internal operating temperature of one
or both amplifier channels has exceeded a safe level of operation and the
channels will be automatically muted. The fans will continue to run and once
the effected channel/s have cooled, they will unmute and return to normal
operation.
The AMB series is also fitted with DC protection, if there is a DC voltage at the
output the protection LED will glow red.
It should be noted that the minimum load for the amplifier is 4 Ohms per
channel (8 Ohms bridged).
If an overload occurs, the amplifier will run into a current limit mode, restricting
the excess current beyond set limits.
4
Attenuator
Level control for your amplifier is provided by a potentiometer on the front panel
and indicates gain. There are two controls on all AMB models. Each control is
labelled for the channel which it operates.
5
Status Indicator
There is a 7 step LED Bar graph given on the front panel for each channel.
They indicate 0dB, -3dB, -6dB, -9dB,-12dB,-18dB, -24dB levels of output
signal.
If using this indicators to line up sensitivities, apply a steady state tone
(e.g. 1khz tone).
6
Clip
This red LED will illuminate when clip occurs.
Clipping can occur under extreme operating conditions such as:
•
complex or very low loads
•
over driving the amplifier
NOTE:
The amplifier is not damaged by running into clipping, but
speakers may be. To maximise the life of your speakers, try to keep
clipping infrequent.
7
Fan Grill
This is where air is drawn into the amplifier for cooling.
NOTE:
You should always ensure that the fan grille is kept clean
and the foam is free from dust or lint. This will ensure longer operation
of your amplifier and reduce the possibility of it prematurely going
into thermal shutdown mode. Refer to the “Maintenance” section on
page 13 for further information.
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