KenChapin

The RCA/pre-amp output on your reciever is meant to send audio signal to a separate amplifier for your sub. If you have a powered subwoofer, just plug an RCA cable into the "Sub out" and the other end goes into the input of the sub amplifier. Alot of powered subs also have speaker level inputs. To use those, plug your front left and rear speaker leads in, and run another set back out to the front speakers. Not sure if this info is what you were looking for, but I hope it helped.