I got a new sub (Yamaha YST-SW315) and while calibrating it through AVIA it produces no sound when it gets to the LFE section. All other test sections produce bass throught the sub, but again, only the LFE test produces no sound. The sub has a radio shack 1-2 RCA Subwoofer cable with the reciever end plugged into the "Sub W. Pre-out" and the y-end pluggend into the L. & R. intpu jacks (the cord didn't specify a side so I just put them in). Is it okay that no sound was produced or is their some other problem going on? For reference I have a Pioneer VSX-D812 receiver. Also, in postioning the sub, is it best to have it running perpendicular with the corner (parallel with the sides of the wall) or tilted towards the listening area. I would guess it wouldn't matter since it's a down firing sub. I also put my sub on a peice of laminated heavy wood (instead of my carpet) is this good or bad?