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Here's the math:
http://ccrma-www.stanford.edu/~jos/waveguide/Diffuse_Reflections_Waveguide_Mesh.html
This device appears to be based on the sample sequence
described in the previous reference: http://www.customaudiodesigns.co.uk/diffusers/qrd734.htm
If it were me, and it were a 25 square box, I'd have 6 depths
(ranging from completly deep to no depth at all). and I'd roll
a 6-sided playing die for each square to determine which depth
it would get. but that's just my limited mind working. the math
dude probably filled a chalkboard with equations coming up with
it. Here's a software product that provides *answers*. It does
all the heavy lifting in math land:
http://www.etfacoustic.com/
"ETF Device Designer, computer aided design of Helmholtz resonators
and QRD diffusers" "ETF provides the DIY user to construct low
cost, high quality acoustical devices with a minimum of design
effort. Parts are available from most home building suppliers
around the world."
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