Do you have a question about the PowerBass ASA 400.1x and is the answer not in the manual?
Details on wiring the amplifier directly to the vehicle battery.
Instructions for locating and securing a quality ground point on the vehicle chassis.
Connection of the remote turn-on lead to a switched +12V source.
Matching amplifier input to head unit output using the GAIN control.
Adjusting crossover frequency to limit mid-range for woofers.
Enhancing low frequency response with adjustable bass boost.
Understanding minimum impedance requirements and risks of low impedance.