Do you have a question about the Monoprice SW-12 and is the answer not in the manual?
Controls the output volume level of the subwoofer.
Sets the crossover frequency between the subwoofer and main speakers (40-150 Hz).
Determines subwoofer standby behavior: On or Auto mode.
Adjusts subwoofer output phase (0° or 180°) for optimal blending with main speakers.
Connects subwoofer to receiver/amplifier SUB/LFE output using a mono RCA cable.
Connects subwoofer to amplifier stereo preamplifier output via a stereo RCA cable.
Connects subwoofer to amplifier speaker outputs using a pair of speaker wires.