Originally Posted by OpusOfTrolls
I am thinking about using polycylindrical diffusers, but I haven't found enough information on them. How big do they have to be, in wall space and depth, to have impact at lower frequencies? Also, do they create lobing all by themselves, or is their reflection clear?
I had the same problem. No info whatsoever on depthm width versus cutoff freq etc. I even asked some specialists on a forum. Apparantly there are almost no data. So I went for it and just constructed a few. I will try to post some pics later, I could link to the studiotips forum, but it is down for the moment.
I can assure you they work very well, even in the back couch, way too close. This would never be possible with a qrd or similar.
The problem is, nobody wants them to work, because they cost me about 25 dollar per square meter, instead of 300 ...
The bigger ones are made out of 1220 mmx1220 mm panels, curved to 980 mm width, giving a depth of around 320mm. I filled them completely with fluffy rockwool - no resonances allowed.
I am 100 percent against time scattering devices which are actually absorbers instead of diffusers, and 100 percent against resonators of any sort. I treated the entire roowm with polys and superduperchunk style basstraps. Great result, no cost.