Knight, this one is probably most for you...for various reasons doing the 3 layers of drywall for part of my ceiling is going to be about impossible. Specifically, my wall doesn't quite make it up to the concrete ceiling by about a foot...and of course this is the wall that is between the tracking room and control/ vocal rooms.
What I CAN do is put one layer of 3/4 MDF up there. Then put insulation....will this give me enough isolation?
Can you do a drawing of what you propose? I'm not clear whether you mean the frame doesn't reach the ceiling, or just the drywall, or?? Also, whether you're talking about one layer of MDF on each side, or just a single leaf of 3/4" MDF... Steve