DIY wood diffusers


I'm having a freind who is a master wood worker make me some wood diffusers.Is there anyone who can give me exact mesurements for proven performance.I'm bassing them on a 2'x4' frame.I would like to know what depth I should make them and how deep and wide each cavity should be..
spaz

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Will quadratic diffusers make your room sound bigger.As I hear this statement often..