Originally Posted by Dennis Erskine
Nope ... not if you want any form of sound isolation at all. But...there is a way.
I can't speak for Dennis, but I had an idea (I haven't tested it, so use at your own risk):
If you strip your ceiling or wall down to nothing but studs (or joists) and the drywall behind the studs (or floor above the joists), you could drywall the inside of that cavity, perhaps decoupling that new drywall w/ standoff clips or strips. Then, you could fill in the newly drywalled, slightly reduced in volume cavity w/ whatever fiberglass or other treatment you want, and then cover the whole thing w/ GOM or equivalent.
It's a lot of work, but I might give it a shot, as I currently have everything exposed in my theater room.