I have and AudioSource SW 50 8" sub and an Onkyo TX-SR601. I am trying to get that sub to work on the reciever, but everything I have tried has failed. The sub has the Red and White RCA inputs and the Red and Black wire inputs. The reviever has a Subwoofer Preout which is purple, and a Sub out in the DVD section of the reciever which is also purple. Someone told me to get a Sub cable. So I got one from radio shack which has the one connection at the end for the reciever and splits into two down at the sub end. That didn't seem to work. But when the split end was hooked to the sub and I touch the end of the cable on the reciever side to the silver coating on the outside of the purple Sub Preout input I get sound from the sub. When I fully connect it I get minimal to almost no sound, even at full volume. Anyone have any ideas why I am not getting sound from the sub? I know it works perfectly connected directly to my DVD player. But I would rather have it hooked up to the reciever with the rest of my speakers.