12.Front HP/LP/FULL Switch: Select the desired crossover setting. HP/LP/FULL for the speaker output signal of the front channel.
13.Rear Input INT/EXT Switch: Select the INT position if you want to use the internal signal path from the front crossover for the rear input, or the EXT position to use the external rear RCA input.
14.Rear Source INT/EXT Switch: Select the INT position (switch in) if you want to use the internal signal path from the front crossover for the rear input, or the EXT position (switch out) to use the external rear RCA input.
15.Rear Gain: Use this control to match the output level of the head unit to the rear channel of the amplifier.
16.Rear Freq. Control: Move this detented control in a clockwise rotation to adjust the rear crossover frequency from 30Hz to 4kHz.
17.Rear HP/LP/FULL Switch: Select the desired crossover setting, HP/LP/FULL for the speaker output signal of the rear channel.
18.Sub Source INT/EXT Switch: Select the INT position if you want to use the internal signal path from the rear crossover for the sub input, or the EXT position to use the external sub RCA input.
19.Sub Gain: Use this control to match the output level of the head unit to the sub channel of the amplifier.
20.Sub Freq. Control: Use this control to adjust the sub high pass crossover frequency from 30Hz to 4kHz.
21.Sub HP/LP/FULL Switch: Select the desired crossover setting, HP/LP/FULL for the internal output signal of the sub channel to the speaker output.
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