[Future240]

^They should be wired directly to the headunit, and the sub control is built into the head unit.

Theory: I used the wiring harness from my previous pioneer cd player. The previous one was installed by someone who shouldn't ever touch another vehicle. The latter installed by an engineering major. Could the way the cd player is wired into the car make the cd player treat the back speakers as if they were subs. Which would make nothing but bass come out of the rear speakers, but since the subs are so overpowering it sounds like nothing?