Quote:Ceiling is now 24" o.c. trusses,mesh covered with 12" cellulose sprayed on top of mesh. I was thinking of not sheet-rocking but covering with fabric?
I can see this being problematic - having a giant absorber, without knowing what it will do. Having random treatments before you know the issues, is like taking a random medicine for a possible future illness. Basically what I'm saying is more isn't always better.
So, if you can leave that till later (i.e. do nothing with it and take measurements in the meantime), cool - otherwise just drywall and deal with the consequences.
As for the walls, sheetrock makes the most sense. If you keep everything the same/equal, you'll have known factors and can use math to predict what issues you'll have and what you need to correct it. Knowing the final dimensions of the room gives you 90% of what you need...the rest is measurements, making corrections (sound treatment - which you've already built), and more measurements.
I suppose you could double up on the sheetrock with some Green Glue acoustic adhesive between the layers - that will make the walls less resonant in the audio spectrum - but it's not really necessary.
Steve recommends nice thick padding and quality carpet to take floor reflections out of the equation. But I've also heard hard floors sound good if diffusers and/or absorbers are used to tame that first reflection (from the floor).
I'm not sure what you mean by "compensate for the brick backside on the right side". Again, my recommendation is to make things as equal as possible, and work back from there with your absorbers and diffusers. Since it's a dedicated room, I wouldn't hold back at all - go full on room treatment and takes measurements along the way to dial it in. The goal being to diffuse as much of the first reflections as possible so your ears can hear the source perfectly, and use absorbers to try and tame low frequency nodes.
Man, I wish I had a dedicated room that large. I'd be going crazy with it!