I have recently bought an amplifier (CX475, may?something) and could do with some help. Does anybody have a wiring diagram or can tell me how to wire the speakers and sub-woofer. It is a 4 channel amp and I have one set of speakers and 1 sub. I am having trouble with powering all 3 at the same time. I'm only using 1 rca lead but have space for more than 1. At the moment, I have the sub bridged with the speakers on 2 channels with the 1 rca. Any ideas?