i just got my power acoustik 4000/1 mono block and i dont know where to set these setting at or what they do. it is hooked up to 2 12's w6v2's jl audio
Subsonic filter is a high pass filter for sub frequencies. If you have a ported box set the subsonic filter to the frequency of the port tuning on the enclosure. And phase i think is used when you invert the subs, im not sure though. Just leave it at 0 and it should be fine.