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I could add that 3" x3" wells were said to be significant in the products original design by Russ Berger, but other than a quick 1/4 wavelength relevance to mid frequency efectiveness...I'm not sure what that is. You can see this "smoothing of reflections" use in many lighting diffusors that have open grid patterns. In regard to the Auralex SpaceCoupler it is 3/8" Paulonia wood which is an instrument grade wood. I do think the wood itself has bearing on it's overall effectiveness.
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