Use an audio cable from your receiver to your subwoofer. Usually the left ( or top if stacked) line out plug on the receiver is for your main subwoofer sound. On the subwoofer, you can plug it into either the red or white rca line in. You can also use a Y connector on the back of the sub to use both lines. it pretty much is a preference. I use a Y adapter. Audio cables are usually reasonably priced and can be purchased most anywhere.