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Hey there Dennis and all!
I have been watching the Youtube videos created by Dennis and team (thank you… very informative!). Also, I have been reading the Handbook of Acoustics, 6th edition.
I am an engineer by trade, 20+ years, so I totally dig it.
So I have a question about the diffusion properties of fabrics, in particular, Guilford of Maine “Acoustic” fabric.
Does this fabric truly offer significant, meaningful diffusion properties within any range(s) of the audio spectrum?
How do the diffusion properties of the fabric compare to those of QRDs? Ok…. I shouldn’t even ask, but I have to anyway. Maybe you could use a laugh Dennis :)
Dennis – could you do a Youtube video on this topic? That would be really cool.
I am not sure if the diffusion properties of any cloth is mathematically calculable. Since I’m a math/science guy, I figure, don’t worry about the cloth material – just cover
the absorption panels with *something*, for aesthetic and health reasons, and use QRDs or other quality products for diffusion.
August 12, 2013
J, Fabric or cloth does not exhibit diffuse characteristics. Creating a diffuse sound field within a room requires adherence to a set of very specific criteria including logarithmic decay and spatial irregularities in-room response along with other criteria. Cloth or fabric can not produce these requirements. It is a sound absorption technology. We have calculated with our units that it has around a 1 dB attenuation factor. This is why most people most do not use speaker grill covers. They hear that 1 dB impact especially with middle and high frequencies.