i was running my 2 12" subs fine no problems sounded really great, but i was using my old-first made box and constructed it pretty shitty, so as a temp solution i cut it in half and am now just using the one 12 while i build a new box, the problem is it sounds like shit most of the time, then all of a sudden halfway through a song sometimes it gets like a surge and sounds like it should usually until my car is turned off, everything seems to be connected correctly including the ground, anyone have any ideas as to why its doing this?