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What surface roughness makes for a good diffractive side wall ?

Wes

Major Contributor
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Dec 5, 2019
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#1
Depth and spacing of surface elements...

Note - elements could be the peaks on a brick.
 

Hipper

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#2
I would have thought that the sonic behaviour of a wall with a rough surface would be more determined by the material from which it is made then the coarseness of its surface. Remember that the sound wavelengths are relatively large (20kHz has a wavelength of 1.7cm).

When you look at diffusor panels their relevant dimensions are much bigger then this.

Of course I could be completely wrong!
 

JohnPM

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#3
Height differences reaching 1/4 of the wavelength of the lowest frequency you want to diffuse, so a lot of height variation. "Roughness" doesn't quite capture it :)
 
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