Just recently finished my 15" HF build and have a question. I have the sub hooked up to a XLS1000 (which is dead silent, thanks for the suggestion over the Behringer). The gain is turned to max on the amp. When listening to movies with a LFE track the subwoofer is set to -12 on the avr per Audyssey settings. There is more than enough bass to get things shaking. However, when listening to 2 ch music I have to bump the sub up to +7 to +12 to get it to hit hard. Is this normal? At -12 the sub doesn't even move. I listen to everything through a HTPC using XBMC and have tried playing audio in Winamp. Same issue.