Treating the ceiling and floor, who else has had great results?

@jeffbij 

Been there too, over damping the room. Biggest fix was diffusers at the two first reflection points on sidewalls. Also using strictly diffusers on ceiling. You can see multiple pics on my house of stereo system.

@baylinor   How are those white PVC diffusers working out.  I've been a litte wary of them because being PVC they should be highly reflective and because there is not much of a difference between the high and low points.  (Unlike most quadratic diffusers I've seen.)

They perform real well if you use them over large areas. By example, I have 28 sq ft on ceiling, 8 sq ft on each back sidewalls and 15 sq ft on back wall. Of course the 6" deep wooden diffusers I have at both first reflection points diffuse in another league, but for a different price too 😊

My floor is wall to wall carpet with padding underneath, and I put 18” triangle bass absorbers in the front corners, but putting anything on the ceiling is not wife approved! Although I was allowed to put 6, 2’X4’ absorbers on the walls.

All in all I’m pretty happy with the sound in my room.

I have treatments on the ceiling and it really made a significant difference,
it would’ve been a big mistake to overlook treating the ceiling,