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1. Power LED - Indicates amplifier power, either in High Power or
Auto High
Current.
2. Clip Indicators - Indicates the signal output level is too high and the output
stage of the amplifier is clipping.
3. Phase Selector - Select between 0 or 180 degrees of output on speaker
terminals.
4. Subsonic/Hawkins Bass Control Switch - Selectable subwoofer
enhancement circuit. Select “SUB SONIC” to engage the Sub Sonic filter
with no boost. Use the knob indicated by callout #9 to set the frequency: 13-
30Hz. Select “Hawkins Bass Control” to engage the Sub Sonic filter with
available boost. Use the knob indicated by callout #9 to set the frequency:
30 Hz to 70 Hz.
5. BIO Port - RCA input and output connections for bridging two identical am-
plifiers. In BIO mode connect between the master amplifier’s 501/OUT to
the slave amplifier’s 501/IN. This will bridge the amplifiers and bypass the
preamplifier controls on the slave amplifier.
6. RCA Inputs - Right and Left channel RCA inputs.
7. Input Level - Input level control variable from 200 mV to 5 V.
8. Hawkins Bass Control “Boost” Adjustment - Varies from 0 to +9 dB of
boost when the Hawkins Bass Control circuit is engaged.
9. Subsonic/Hawkins Bass Control Adjustment - Frequency adjustment con-
trol for the Hawkins Bass Control filter or the Sub Sonic filter.
10. Low Pass Filter Control Adjustment - Frequency adjustment control for the
Low Pass filter.
11. Speaker Connection Terminal - Speaker connections for mono channel.
12. REMOTE - Remote turn-on input from the head unit. Accepts +12V.
13. GND - Main ground connection. Bolt to a clean chassis point in the vehicle.
14. +12V - Connected to a fuse or circuit breaker, then to the battery’s positive
terminal.
15. FUSE - Main power supply fuse. Warning: Replace only with the same value
fuses!
KEY TO CALLOUTS