Do I need a subwoofer cable with a Y adapter on it for the Denon 3803 or will a single cable do? Here's a pic of the back: http://www.usa.denon.com/catalog/pho...803%20Back.jpg The only place there's a subwoofer RCA out is in the area below the 1st component video inputs. Looking at the receiver at home it seems to me that this is the only place to put a subwoofer cable. Correct? Thanks.