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Interesting discussion. Regarding the resonant quality of the paulownia wood verses another material, I'll start by what I have heard. I have heard both the Auralex paulownia products (SpaceCouplers & SpaceArrays) as well as the RPG hemishperical diffusor and all three are top rate devices. I don't know the history of the product development process taken by Russ Berger on materials benefits when designing the SpaceCoupler, but there is certainly no detrimental resonance.
So, I think it (the material of the product) is worthy of mention. At some level everything is resonant and this is important...at other levels it's important to keep a balance between esoteric and meaningful. That being said, were a "Coupler" to be made of MDF/HDF I do think it would perform and could have different qualities (would have to be tested both objectively and subjectively to know). I do not think that a typical cardboard would give same performance.
I look forward to the field test results Terry J
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