Here you can see an example of a diffusion coefficient normalised to a flat surface. The calculations is based on ISO 17497-2 from my personal investigation. I'm looking for reliable datas for any diffuser device to start comparison work.
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Looking for reliable datas of random incidence diffusion coefficient based on ISO17497-2
Looking for reliable datas of random incidence diffusion coefficient based on ISO17497-2
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Comments (6)
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Good question. Have you looked at the data in the Appendix of 'Acoustic Absorbers and Diffusors, D'Antonio and Cox'?
maybe you can find some on the RPG products site and the GIK products site. i remember seeing plots there -- not sure to what standard or testing labs were used.
Very rare information...
Decent question Christian. I suspect if our numbers grow it may get answered down the road. I am curious as to how much diffusion is needed to become useful, audible. I see friends using, and I have recommended, Newell's 345 pattern. This presents 50/50 absorption and reflection. But I have read that 30% perforation is in effect, acoustically transparent. Also, I am a great admirer of the work of Bogic Petrovic, Boggy, sadly RIP way too young. He often used very sparse arrangements of lath over absorbent. So little that one could not imagine it making any difference at all. Conversely his My Room design used a huge area of diffusion. I have seen/hear a few videos on Youtube with a cello playing in such a space. The diffusion is easily and very audible.