Hello,
Yes, I'm aware of Roy Allison's research and your advice about keeping the woofer at unequal distances (or distances that aren't multiples) from adjacent surfaces is good. But there's been a lot of interesting research and testing going on about the interaction of rooms and speakers, mostly from Dr. Floyd Toole and a colleague, Sean Olive, since Roy Allison's papers in the '70s.
While Allison's contributions to early speakers from AR in the '60s were invaluable, I've always found his own products disappointing, including a top-of-the-line model I reviewed under rigorous double-blind conditions at the National Research Council in Ottawa. Roy Allison's conclusions notwithstanding, I'll stand behind the results of double-blind listening tests in which I participated. These involved moving speakers to different locations in an IEC room and different locations for the listeners. At times the influence of the room and the listener's position or the speaker's location was far more significant in rankings of the speakers than different brands of speakers being tested.
Regards,
