It seems to me that cork would absorb sound. But, it also makes sense that if it were arrayed in a way other than a flat sheet (i.e. corrugated or misshapen in some fashion, it would diffuse sound very well.
CORK: Diffuse or Absorb?
I bought these cork bath mats a while ago. I use them over a window just to the right of my speaker and duplicate this on the left side. I just bought a Vicoustic diffusion panel, the Multi-fusor wood 36, and mounted it in back center of my speakers. I very much like what diffusion does in my room, and want to do ad more. So back to the original question.... Does anyone know if Cork absorbs or diffuses?