ok guys... what does changing the settings for "subsonic" on the back of an aftermarket amp do for the subwoofer sound?

 

the Subsonic filter works sorta like a crossover; it limits the extreme bass going to your subwoofer. ive seen set ups where they keep it as low as possible for a sealed enclosure, and if it is ported, whatever your boxed is tuned too, about 5-10Hz. but that is my best guess from my experience messing with mine. lol