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Originally Posted by lucey  Diffusion below 500 is not possible afaik... certainly not with that panel. |
Quite possible to diffuse below 500; just not common in studios, and as you observe, not with that panel. As for simultaneous absorb and diffuse, yes, there are things that do that, and some that will absorb low and diffuse mid and high. Even wooden QRDs absorb low-mid to low frequencies to some extent. Some studios have very large QRD difffractals (essentially multi-band diffusors) which will diffuse low frequencies as well as mid and high, but they are expensive and difficult to build, and of limited use in the typical small room acoustics of most control rooms. However, they do exist and they have their place. Take a look at the back of Bob Ludwig's main room at Gateway for an example of a large diffractal.