Precision Power PPI4240 - Manual (Page 10)

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9. Rear X-Over Freq
Select the rear crossover frequency here. The detented control moves
clockwise from 20Hz to 5kHz. Use the chart on page 20 to select the
desired crossover frequency.
10. Rear Gain Control
Use this control to match the output level of the head unit to the
amplifier.
11. Front X-Over Switch
Select the desired crossover setting, FULL/HPF/LPF for the front
speaker outputs.
12. Rear Input X-Over Switch
Select the desired crossover setting, FULL/HPF/LPF for the input
signal to the rear channel when using internal signal path vs.
RCA input.
13. Rear Input Internal/External Switch
Select “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 X-Over Input Switch
Select the desired crossover setting FULL/HPF/LPF for the rear
speaker output.
15. Output X-Over Switch
Select the desired crossover setting, FULL/HPF/LPF for the RCA