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Thoughts on Cieling panels

Posted by tlenthe on March 1, 2005 at 04:45:45:
My understanding is that the absorber panels are effective down to the sub 1Khz range (I'm guessing where the wavelength is 2X the absorber thickness). I recall that Jon indicated spacing the panels away from the rear surface effectively increases the thickness and therefore lowers the effective absorption frequency.
In either case, you would want to position the panel to intercept both the incident and reflected wave from the ceiling to your listening position. With a cathedral ceiling, it's possible that there isn't a direct reflection from the ceiling to the listening position, or it may be behind your listening position (depending on whether your speakers are in the short or tall end of the room). Use the mirror method (either real or imaginary!) to determine this position.
As far as bass absorption goes, you already handle that with the traps. The middle of the ceiling shouldn't be a prime pressure point for bass absorption, so going to a lot of effort for spacing may be in the realm of diminishing returns (not to mention, potentially unsightly on your cathedral ceiling).
I agree with the previous posters to try some type of quick, temporary arrangement, since your ears are the final judge.
Good luck, and let us know what you end up with. - Ted
PS - I have a suspended ceiling with (nominally) acoustic tiles and didn't notice any difference with jury-rigging mini-absorbers (1' x 2' "pillows", essentially frameless panels) at the ceiling reflection points