Audio diffuser

@rixthetrick we are on the same page. Front wall behind the speakers 

.

With the trays it would be about 54 inches tall and 36 inches wide behind each speaker.

What is the size and layout of your room? Is it dedicated for listening and where is your listening position? 

I think you have a great plan. How did you determine the size of the diffusion panels? I started with 2 panels behind speakers and i used absorbion in both corners. My room isn't very wide and I found that one panel between the speakers worked better.

My room is 14x22x8. Speakers are about 19in off the front wall 1.5 from side wall.  I sit 13 feet from the speakers. They are not toed in. i have a fantastic sound stage with 90% of sound coming from the center. It's just on some music the treble gets a little hot on my ears. Bass can be a little weak at times. Thats why I  thought just the 2" depth. Just enough to break up the high notes. 

Haven't determined size yet. I have bass traps and absorption on the back wall and sides. Dedicated music room. Can't do just the center as I have a TV hanging dut covered when not in use. 

@knighttodd , sounds like a well damped room so far. I also went 2" behind and to the side of speakers, I need all the bass I can get.

I don't know how much the high-end will be improved by your new diffusers. There's mostly backwave from speakers, your bass will probably tighten up and image may become more focused. For highs you may need to treat the ceiling.