Two subwoofers in smallish HT room?

I don't know about Rives suggestion about canceling room modes by having one SW at the back, but, years ago when experimenting with matrix quadraphonic sound I found that bass from the front speaker could be greatly reenforced by the rear speaker playing the same signal, but with phase inverted. This would happen if the speakers were one half a wavelength apart.

I tend to think of subwoofers as just another driver of the speaker system, so that each speaker should have its own colocated SW. I have three for my front channels, and would have two for the rears if I thought that the rear LF response was a problem.

Eldartford

Phase inverted rear sub is being put to use by a few people these days...along with myself.

I read about this at Vmps's web site around 8 years ago so gave it a listen and loved it. There was also a long thread at the Audiocircle forum regarding this about a month ago. If I recall, the guy that posted on it had 4 subs.

Dave

Electrical phase reversal may actually be putting the sub in acoustical phase with the mains.You can also have a phase or timing issue with another sub plugged into a separate AC line other than that used for the main sub..Tom

Sogood51...I noted the bass reenforcement from an out-of-phase rear speaker as a BAD byproduct of matrix multisound. For me it seemed boomy. This is what you would expect because the reenforcement is peaked at a wavelength that corresponds to a room mode. I can't imagine why anyone would do it.

Eldartford

Sounds like you use a high X-over setting with your subs...boom should not be a problem.

Dave