Im very poor and a friend offered me his amp and subs for free. The subs are 2 old 8' rockford fosgates. the amp is a very old non name brand pos. only one channel on the amp works and every time i hook up the subs they stop working within a few hours. How would you wire this.

Also, the subs seem to only be working as speakers and not as subs. I checked and they are plugged into the head unit in the right place but they are still only being used as speakers, any idea how to fix that?