I have 2 inputs on my cd player. The "rear input" and the "SW" inputs which I can only assume means Subwoofer. I know my cd player (pioneer 6600) is able to run a sub-woofer on its own without an amp so I'm wondering if the "SW" inputs are for that and the "rear input" is for if I run an amp and a sub-woofer. I guess my question is which input (sw or rear input) I'm supposed to use for my amp which runs my sub?