"Karl Uppiano" wrote in message
...



Fortunately, long wavelengths and large excursions are mostly in the low
frequencies, which tend to have minimal out of phase characteristics
(which is why subwoofers are practical).


More to the point as far as subwoofers are concerned, the ability of human
hearing to determine the direction of a sound source becomes less effective
as the wavelength lengthen, becoming pretty well non-existent at frequencies
of 50Hz and below. So not only does it not matter if these frequencies are
presented in mono, but it doesn't matter much where the subwoofer is in
relation to the subs either.

David.