Quadratic Diffusers

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.

@audition__audio What do you have? Would you be getting rid of them?

I have a number of RPG Skylines (2' X 2' X 4") and a number of RPG which are (2' X 2' X 6"). The larger ones have a few missing pieces but the Skylines are perfect. These are made out of a sort of styrofoam material. Feel free to contact me directly in the event I decide to sell. Through the years I have accumulated enough material to do a few rooms and it is taking up space.

I looked for skyfusers a while back. Alot of options out there. I ended up with Vicoustic DC2. Largest area for the price, can easily be mounted with double sided tape on ceiling or walls and was inaudible from the wood versions.

@hilde45 - So it's been a few months, what have you ended up doing?

Today I finished the second of four QRD17 diffusers, I used linseed oil and they look beautiful. Next task is placement, and finish off the last two diffuser assembly and oiling. I had no idea that they'd be as heavy as they are.

I am going to try them between the speakers on the front wall first.

Anybody who's got quadratic diffusers I'd like to hear from you as well?