@audioquest4life
I use a product from Vicoustic, Wave Wood. It is similar to the new GIK diffusort panel, the Wave Wood is wood over absorbers, and serves as both a diffusor and smaller absorber. All I can say, after may years of experimentation, this is the best combination that works for me. Of course, some environments will require a lot more absorption than others and integrating diffusors into those types of room may be challenging. I would strike a balance between the absorbers and diffusors. In most rooms I have treated, I have had positive results using this formula.
Have you tried RPG Expo ?
This type of panel based on a perforation pattern is a tuned absorptive product.RPG Expo is design around optimal binary sequences – these begin to scatter frequencies above ~4KHz.RPG is the only company that has a method behind this type of digital surface approach.With the right mounting condition they are excellent for the right application.