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But, your typical small room benefits greatly from multiple sub-woofers.
Assuming that you are listening somewhere near the center of the room and you have a suffciently steep LPF, then lobing isn't an issue. By placing 2 or 4 subs in the right places, all you really do is cancel/not excite room modes.
Consider a room with 4 subs in the corners half-way between floor and ceiling:
In a square room 30 feet on a side, if you stay 4 feet from the wall, the worst path-length difference is 36.8 feet. This gives you a first cancellation at 15 Hz and another at 45Hz. This could be bad, except that the other 2 woofers are 26.3 feet away and you have all of your reflected waves arriving about 1 cycle later (at various times).
Do you want to argue about bass transients? The modal ringing is already dealt with, so we are talking about the first 2-4 cycles...
-tINY
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