I recently just bought the Yamaha RX-A1000 receiver and everything is working fine except for the subwoofer when put on certain inputs. I have two blu-ray players and one dvd player hooked up with the multi-channel inputs on the back. Those three items are the only things that work with the sub. Everything else (IPOD, Phono, DirecTV, Pandora, etc.) will not pick up the subwoofer. Does anybody know why this is happening?