Planar Speakers and Diffusors

@ozzy what are you intending to change with diffusers?

From the setup pics, the main issues I’d predict are (1) proximity to the sidewalls (seems the company recommends more space between speaker x side boundaries?), (2) fully carpeted floor (might cause lopsided response for speakers that benefit from relatively lively rooms?) and (3) that huge tv.

I’m not sure you can address (1) or (2), or what kind of difference diffusers might render if (1) and (2) are even real issues at all.

Betting you’d do well to get some lightweight softwood blinds or other slats to hang over that tv. I suspect the front wall bounce may be extreme.

I've used planar type speakers for over 40 years, so I'm very aware of the issues with setup and room. Currently using Maggie 1.7i's in a 22' x 16' room with a 9' ceiling. generally it sounds very good. I also have a large(ish) TV (65") in between the speakers. The TV being there is a BIG influence on the sound stage and image focus. I have a very thick soft wool type blacket, doubled over, which I drape over the TV when critical listening, and when used the result is not subtle. I've demoed it several times to audiophile friends and they all hear the improvement it brings, instantly.

My theory is that the sound bounces off the wall behind me, then forward to the TV and then back to me, and the 'blanket' reduces that secondary reflection so one hears the direct sound from the speakers more prominently. It works, and very well, for me.

One Magix think is ever ever so slightly  a bit of absorption. I had a guy who had me hang a shear four inches off the wall behind the speakers  the material  what to be a shear with holes in it. And wanted enough  so I could change where there were more folds in it. The end results were just enough so the sound stage expanded and everything  cleared up just a bit more an increase in resolution.  I had a set of Maggie 3.3 back then and they were actively  biamped. Also had diffusion  behind the curtain and at the reflexion points plus behind the chair. The diffusion  panels were approximately  2 x4 feet. Had them all on stands about 16 inches high. At the first reflection  point had a small amount of suction in the diffusion  panels. In that room with that setup I personally  have never heard any system  come  close to the sound stage I had. I personally  like what I have now better but the wonderous sound stage was fun to show off. The tonal balance  was basically  perfect  what was missing  was the fun and beauty part.it was boring In comparison  to any of my current  setups. 

Regards 

@ozzy 

I know nothing of planar speakers as I never used any. However I can easily point to the gigantic TV screen between your speakers as a major reflection contributor. You need to at least cover it with some type of 100% wool covering while listening to your stereo. Diffusers behind the speakers would have a very small effect considering any reflection from the back wall will go straight back to the speakers as they are not angled/toed-in at all. The problem is compounded by the fact that you basically have no space between the TV and ceiling. It's in effect like a glass wall. Plus if you follow Gik's directions, I believe the Q7d are recommended for the back wall and back of sidewalls. I spent a fair amount of time and money on acoustic treatment so I learned a thing or two over the last 5 years. Best of luck with that beautiful audio equipment.

Bottom line you would be better off diffusing the back wall with the Q7ds imo.