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Old 6th December 2002
Moderator emeritus

Originally posted by Fletcher
An expansion ceiling goes up... a compression ceiling goes down. The theory [simplistically... very simplistically] is that an expansion ceiling will help keep the front of the room a 'reflection free zone' [in terms of high end] and a compression ceiling will net you better bass efficiency.
Thanks! And then what about those which go up at the front and down at the back?