Originally Posted by VideoGrabber
In my opinion, yes, that would be far too much absorption. The room will be overly dead, with no high end, and no reverberant field.
While you certainly could then counteract some of that with reflective materials placed under your velvet (assuming that material was acoustically transparent, which it may not be), I think it makes sense to begin by asking how much of the surface area should be absorbent, vs. diffusive, vs. reflective. Then you know what to start with as your default surface material. The largest of those 3 would be reflective, so why start by eliminating that, then trying to add it back in again? Seems counterproductive to me. Unless you're planning to rely on the Roxul for it's thermal insulating properties as well?
Thanks for the reply . Well, I do live in Canada, more insulation is always good.
Actually, the exterior side walls , floor and the screen end wall will be insulated already with R40 . Only the center interior wall will not be insulated already, I plan to use
a double wall and plenty of insulation there as the other end of this second story is our main bedroom separated by a hallway .
Within the theater loft ( sloped and vaulted ceiling) I have to build a knee wall on the sides . I'm going to frame out the sides and end, add Roxul between the studs in about
1/3rd of the spaces leave the rest. I will be able to add or remove easily because the covering will just be velvet panels attached with Velcro strips . Once I'm moved in and all furniture in place, the carpet, stage and speakers , fixtures and so on, THEN I'll fire up the REW ( room EQ wizard ) https://www.roomeqwizard.com/
see how it looks .
I'm more concerned about sound travelling back the floor or through the roof at this point , that's what I have to concentrate on . Within the theater I will have the ability
to add or remove reflective or absorption panels to balance things out.