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Old 23rd September 2012
  #10
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Quote:
Originally Posted by John White View Post
How does the total area of the diffusors correlate to the prediction models? In other words, if one wanted to match the low frequency diffusion as modeled in the software, how large (height/width) would the units have to be?
When measuring or predicting scattering and diffusion coefficients, one needs to measure (or model) a big enough surface (more than one period) or the values given will be very high and mean nothing. An empirically derived limit states that the total width of the sample needs to be at least 16 times longer than the total structural depth. A common total panel width used is 3,6 meters (as in the appendix of Acoustic Absorbers and Diffusers).


Edit: The height of the sample is irrelevant assuming 1D diffusers since we´re only concerned with the scattering in the operational plane of the diffuser.