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Adding additional subs almost always results in smoothing.

The only time adding an additional subwoofer would not result in smoothing is if its pattern of in-room peaks and dips exactly overlapped the pattern of the original sub(s). And the only way that would happen is if it was placed in exactly the same location occupied by another sub, which is physically unlikely if not impossible. Remember that when you add another subwoofer, you turn down the volume of the previous one(s) so that the average bass SPL stays the same. Spatial and to a certain extent frequency response smoothing goes up as the number of bass sources in the room goes up, according to Geddes, as I have previously cited.

There are plenty of 1/4 and 1/2 wavelength peaks and nulls below 100 Hz, but they are the result of reflections off of walls far away from the subwoofer, not the wall close to it. I said that before. This is one reason why each subwoofer's in-room pattern of peaks and dips will be unique.

You also already brought up the floor-to-ceiling mode issue, and I acknowledged that vertical scattering would be beneficial, and pointed out that mulitple subs on the floor would be no worse than the one or two subs on the floor you advocate - and at least my way gives you the option to scatter vertically. And if vertical scattering is benefical, then likewise scattering in the horizontal plane would be beneficial - which my technqiue calls for and yours does not.

Duke

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