All, First, the equipment: Yamaha RXV-870 (Prologic ONLY) receiver Sony Sub Bookshelf speakers serving as left, right and center. (mix of older Infinity and Boston Acoustics) With that out of the way, I've got a question: would I be able to run the sub using both the speaker level inputs and the line level inputs at the same time, and if so, would it sum all inputs or just use one or the other? I should note that I bought the sub open box and it didn't come with the manual, if anyone has a pointer to a .pdf of the manual, I'd really appreciate it! Reason for this is that my receiver doesn't have any type of bass management, but it does have a "sub out" that is supposedly crossed over at 200 Hz. I have previously had it hooked up through this input, but I've been less than impressed with the results. It always seemed to be lacking something for movies, although I knew the sub was working fine during 2 channel listening. It finally hit me today: I had some music playing that I *knew* should have some decent bass, but there was none to be found. OOPS, had the receiver in Pro-Logic mode. Turned that off and the sub came to life. It seems that the "sub out" on the receiver only catches the L&R channels. What I was thinking would be to run the center channels (remember, I'm using two bookshelf speakers, and the receiver actually has two outputs for the center) through the sub using the high level inputs and still leave the "sub out" from the receiver connected to catch the bass for the L&R. This is the only way that I can see to get all of the bass from the front three channels to the sub without buying a new receiver. Anyone care to comment? I can't try it right now as I don't have enough wire to test with.... Thanks, -Brett.