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AA-100/AA-120 Audio Amplifiers Installation/Operation Manual — P/N 9000-0573:C 03/12/2020
Terminals and Connectors
Adjusting the Audio Gain Level
5.1 Adjusting the Audio Gain Level
The Installer can use a multi-position rotary switch to adjust the gain of the audio output signal to
compensate for audio line losses. After you make the correct adjustment, the audio amplifier pro-
duces its maximum rated output power.
5.1.1 Procedure to Adjust the Audio Gain Level
After you complete the installation of all
amplifiers and associated circuitry, adjust
the low-level audio input to the amplifier
set for normal standby. To adjust the
audio gain level, do the following:
Figure 5.1.1.1 shows the Audio Gain switch.
1. Use a small slotted screwdriver to
position the rotary switch until the
NORMAL LEVEL LED is lit and
the INCORRECT LEVEL LED is
off.
2. The audio gain is properly adjusted.
Figure 5.1.1.1 Audio Gain Level Diagram
NOTE: R-470 Resistor Installation Requirement:
You can install an R-470 resistor assembly across P3, (pins 4 and 5) of the last directly connected
device on the low-level audio riser. This installation calibrates the audio amplifier. Failure to do so
will cause a calibration difficulty.
Audio
Gain
