A 4173A
PA Amplifier Stereo/Bridgeable 2x550W
Front Panel
1. Mains Switch
When you first press the switch, a soft start circuit will run to avoid a surge
strike. In about 3-4 seconds there will be a click to indicate that the soft start
has finished. 1-2 seconds later there will be another click to indicate the
amplifier is connected.
2. CH-1/CH-2 Input level control
Adjust the control to the desired volume. Only use the CH-1 control whilst
amplifier is set in Bridge or Parallel mode.
3. CH-1/CH-2 Protection indicating LED
The LED will light up red to indicate when the amplifier is running un-stable
or has gone into thermal protection.
4. Clip LED
This LED turns on just before the maximum output level of the amplifier
has been reached. The clip LED’s may also turn on from time to time due to
song selection however they shouldn’t stay lit for long periods of time. When
this occurs we suggest you turn the output level down.
5. Bridge mode indicating LED
When this LED lights, it indicates the amplifier is working under BRIDGE
mode. The input signal only acts on CH-1.
6. Parallel mode Indicating LED
When this LED lights, it indicates that the amplifier is working under
PARALLEL mode. The input signal only acts on CH-1.
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