I use this for CD music. Its all I have for now. It has a subwoofer out on the back ..I cant tell if its R/L or just one pin. I think its purple. But there is a green pin above it and it does not make it clear if you use both pins or just the bottom purple one.?? It looks like its just one pin connect. If I use the sub out on the Oppo and go to the subwoofer in and use just one of the channels. I guess thats ok?? Would you use R or L..??.... Would you do it this way or wire directly to the speaker ins and outs with speaker wire..??My amp has only basic connections..no sub out..