acoustical properties of soundboard/foam

[griffingerritsen]

No Ideas on this? I found this page that has a lot of coiffiecients Coefficient Chart
I think they might be refering to soundboard as fiberglass board? But I don't know.

I can accept it if this stuff is useless for me, but I'm not the type just to take that as the answer. I need to know why just so I can understand. To me everything has some acoustical property. Ever hear how the sound of your amp changes when a fat guy stands in front of it?

I assume I got no responses because maybe these products have no practical application at a reasonable thickness, but I'm still not sure since I can't find any specs.

[griffingerritsen]

Since I'm still talking to myself... I am not an acoustician or something, but, I think my room is sounding pretty good with the improvements I have made. The main problem seems to be right under the beam. There is a parallel wall that happens only there and is part of the problem. I am able to get rid of about 70percent of the flutter echo or whatever it is by just leaning a piece of plywood or rigid foam insulation against the wall under the beam to break up reflections. Soundboard also has a good effect...
But what could be the other 30 percent of the problem? My theory is that since it is at the high point and in the middle of the room the sound is getting compressed going both directions.

I don;t know what to do to fix this if it is the problem. The only thing that makes sense to me it not to put any instruments or mics under the beam...

[CarloBadalamenti]

It’s very possible you’re having problems with sound up in those vaulted ceilings, especially with the size of that room. You could possibly make framed and covered DIY treatment from the soundboard placed against the vaulted walls and ceiling, but of course, hanging anything on a vaulted ceiling is easier said than done and may be more work than it's worth, especially if you're uncertain about its properties.