It's hard to tell you exactly what's best for your room at this point. First thing is the ceiling is extremely low, so ceiling treatment would be a good place to start. I also agree that I see too much diffusing and not enough absorbing. Specially that you do not treat any corner with bass traps. Best I can tell you is to take a good look at my house of stereo system to see the acoustic treatments placement I made over the last 4 years to get to the results I strived for. It is not easy. Many original acoustic settings I started with had to be modified but it is all worth it in the end. It's a journey. A long one. 3 years for me in that room alone.
Need help from you acoustical experts
Here is the latest version of my new listening room. Everything is nice and symmetrical. Depth is ok, width could be a little better. Most of the treatments are from GIK Acoustics, placed where they recommended.(mostly).
Treatments on the side walls are at 1st and 2nd reflection points.
Walls are drywall screwed and glued to steel studs, paneling glued and strapped to drywall and filled with Rockwool. The ceiling has R30 insulation covered by CelingMax grid, screwed to the joists (not hanging). Dedicated circuit for the stereo, and HVAC ducts insulated to keep it quiet.
Yeah, it’s very quiet. Creepy quiet.
My issue is probably with the treatments. Midrange/singers are very forward, and high in the room. Usually as high as the white music note panels, and sometimes the singer sounds like she’s on the ceiling between the speakers.
Anyone see a mistake I’m making with the acousticsounds panels, either placement or type?
I’d like to post some pictures, not seeing how to do it. Guess you'll need to look at my profile.