Yeah close to 40” or so to work with behind theater screen wall. QRD is 8” deep. In my other 2ch room I have Arqen’s fractal “diffusers” up front. Same idea just a gentler effect about 4” deep. I would go QRD vs any other type if you arent going to see them or have enough depth. They can be gorgeous if made from wood, but weigh a ton. Mine are both EPS foam based and painted solid color.
This guy copied their rooms front wall after his Sonus Faber visit. He still hasnt reviewed the M5s properly after his Axiom factory tour…. I guess he would vote for QRDs. Although his look shallow?
He is ridiculous too though….
https://youtu.be/raBihcmADDgMaybe I’m ridiculous? Dunno.
