Search google for a schematic should be able to find one. I repair amps. Marks Car Audio & Amp repair e-mail skinnman33 @gmail.com I can be reached at 727-266-6398 Let me know
It depends on how many channels are on the Amp. If it's a 2 channel you can bridge it using the positive on one channel and use the negative on the other channel. The Amp will give the sub more power bridging the sub.