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Seamus,
Thank you very much.
By the way, your 20+ ft. deep room will be nice for monitoring. I've found that if you monitor a couple of feet forward of the midpoint of a 20 ft. deep room, the 12 ft. distance from the back wall puts you in the 1/4 wavelength null point of 24 Hz or so, a very acceptable frequency for a null since it's all but inauduble anyway. The biggest thing you have to worry about then in terms of rear wall reflections is the 3/4 wavelength null (72 Hz). We use tuned traps to combat these type of nulls.
Rooms that are much less deep move the 1/4 wavelength null up unto the 30s and 40s where it really hurts the bottom end. That's fine for certain production tasks, but for critical mixing, a 20 ft. deep room is pretty deluxe.
--Wes
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