When I built my theater - I choked on the expense of doing all of the quiet rock products.
They have an entire host of products that help keep the sound from your room from leaking out. For me the cost was going to be about 2.5 times that of traditional drywall thus I took the cheap way out.
I can see in a condo this being a MUST. Check out this unit in Marina Del Rey that used it. http://www.modernhometheater.com/vir...ach/slideshow/
I also can see a studio using this kind of isolation to keep people from interupting a session with other noise.
At the Boston Acoustics labs - they have totally isolated rooms that i am pretty confident they use Quiet Rock in.
Do you think this is worth the investment for your theater?