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.