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Originally Posted by bob katz  The back wall behind the mesh screen contains giant-size RPG diffusors, the depth of the largest piece of wood is, if I recall correctly 4 or 5 feet! |
That's a great point, Bob. I've experimented with several rooms that have a multi-tiered stepped rear wall, which is sort of a poor man's QRD diffusor.
In all cases the quarter-wave peaks and nulls were less than expected. However, to my way of thinking, a room design like this is more about reducing bass problems than "diffusing" in the same sense as when scattering mid and high frequencies to retain liveness. At low frequencies sound doesn't travel in rays as happens at mid and high frequencies, so diffusing behaves differently. I should revisit this again and do some more testing - not only the improvements in raw LF response, but also how LF decay times change (or not).
--Ethan