Perhaps a definition of "diffusion" is in order.
According to Alton Everest in the Master Handbook of Acoustics, here it is.
The frequency and spatial irregularities obtained from steady state measurements must be negligible.
Beats in the decay characteristic must be neglible.
Decays must be perfectly exponential, i.e., they must be in a straight lines on a logarithmic scale.
Reverberation time(RT-60) will be the same at ALL positions in the room.
The character of the decay will be essentially the same for different frequencies.
The character of the decay will be independent of the directional characteristics of the measuring microphone.
anywhere from 1 to 2 inches in diameter.
From my understanding, for frequencies whose 1/4 wavelengths are longer than the diameter of the bamboo, there will be little effect.
To gain an understanding, consider a 100hz wavelength is 11.3 FEET and its quarter wavelength at 28 1/4", and you'll begin to see why. And btw, polycylindrical devices do NOT diffuse, at least by the standard listed above. They simply reflect those frequencies that are affected in a hemidisc. If I understand the principle correctly, true diffusion requires time delays longer than 1/2 wavelengths. Thats why in small rooms you cannot diffuse those frequencies with 1/2 wavelengths longer than any dimension of the room. However, my disclaimer is in full force here. So if any expert claims I am incorrect, P U LLEEEEEEEESE excuse me and correct me so I don't spread net fact further.
Besides, I'm still waiting to read scientific lab tests on polys...at least other than the one and only I have seen, which I would link to but can't find.. Oh, and I DO consider bamboo as a poly, only small.
and irregular. To that end, I believe a wall covered with bamboo would still have a specular reflection similar to a flat wall. But thats only my .02
fitZ
