Bob, this is very basic and has been discussed here(and elsewhere)many times over the years. The sound comes from the center of the drivers, not from the side or back of the enclosure. To minimize the peaks and valleys from reflections from the nearest room surfaces(two walls and floor)piling up at the same frequencies, distances from them to the center of the woofer cones should be unequal.

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Enjoy the music, not the equipment.