Before I make a purchase, I had a question about bass management on the 990. I will be using this system for about half music, half theater. I use an HTPC for all of that, using an S/PDIF out from my motherboard for sound, DVI for video. If I have the powered subwoofer connected via a single cable to the 990's pre-out, what happens when listening to stereo music? As I understand it, the audio from DVD's/HDTV will be 5.1 and all bass material below XX Hz goes to the sub. When I play music from the hard drive, what will happen? Will I need to change something or will the 990 do it automatically? Thanks for the help!