Quadratic Diffusers

Hilde45, I am not a fan. I think if you use the proper absorption in the right places diffusers are an unnecessary expense. You can get an entire case of acoustic tiles from the Foam Factory for 25 dollars. Something like 30 tiles. They come all compressed and you will look at the mess thinking you made a big mistake. Just unpack them and walk away. 24 hours later you will have a stack of pristine tiles, they inflate like automatic balloons. I use the 4" tiles. 

@mijostyn I was already given a couple of diffusers which are doing a great job. I'm interested in adding a few more given the current evidence I have that they work. I'm thinking about a diffuser able to operate in two dimensions.

I'm using Stillpoints Aperture 2's.
Cost more, looks better.

ozzy

The Quadratic Diffuser has a limited range (bandwidth) but do add 'dimension' to room treatment.
No need to go overboard though ... narrow down tour need then apply a suitable application.
The vertical slats (quadratic residue) can be combined in a hybrid diffuser / absorber like some of the GIK products.

I have 6 RPG diffusors behind my system and they may be causing me a bit of a problem. I am going to put several sheets of absorption in front of these to see if this helps the problem in my room. Leaving an adequate distance between the diffusor and source should be critical. 

I was at CES when the HFT type devices were introduced by I think a guy named Frank Chang. This may have been one of the first showings in the U.S. In any case they definitely change the sound, but I havent had them in my room so I cant say if they harmed or helped. I am a bit skeptical and would source them from someone other than S.R.

Thanks to mijostyn for the lead on the tiles. I am going to check these out.