Just bought a Pioneer DV-563A DVD player, a Yamaha RX-V2400 Receiver, and a Def Tech 5.1 surround system. If I play a DVD-Audio disc using the multi-channel input, I am getting no output from my subwoofer (I use the LFE out from the receiver). I get discrete surround in all the other speakers. What gives? I do get subwoofer output when I play DVD-Video discs.