Some of the older literature on sub placement is aimed at maximizing output (which would probably mean putting the subs together in a corner), but my impression from reading discussions on AVSforum is that there is a consensus these days for getting as smooth a bass in-room response as possible, for greatest fidelity, and that would probably mean keeping them apart, not both in a corner, and perhaps at different heights. The advice I have seen is to measure the response and do some experimenting with placement.

I have three subs in varying positions, one in the middle of a wall, one out near the middle of the room, and one in a closet. I haven't measured -- too much trouble. I listen to some jazz with a walking bass line, and if the notes don't fade in and out as they go up and down the scale, I figure I'm on the right track.


Greg
VP180, M80s, M22s, QS8(4), CSW S305s, EP500, Pioneer VSX-90
M2i, M3(2), Pio vsx-1020