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Originally Posted by LAstudio  Anybody know the absorption coefficients for a popcorn ceiling? I'm helping a friend set up a home studio space... |
As I explained in reply to your PM, a popcorn ceiling is acoustically the same as a flat ceiling. In order to absorb you need either "fuzzy material" or a vibrating membrane (or vibrating air column). And to diffuse you need a pattern with a depth approaching 1/4 wavelength of the lowest frequency you want to affect. So in that light, I guess a popcorn ceiling diffuses very well around 45 KHz and higher.
--Ethan