Sound blocking materials on outer or inner walls? (1 Viewer)

[Bill Fletcher]

Building a "room within a room" for my home theater which is currently under construction. Plan on putting two layers of drywall and a layer of dense vinyl sound barrier material on either the outer or inner wall. I don't want to put it on both for cost and space reasons. Which makes more sense - inner or outer?

Thanks. Bill

 

[Sankar]

The best method, it appears would be between the two walls.
Check out http://www.acoustiblok.com/instal.html
And click on the reference diagrams at the bottom. Preferably, there should be some space between the barrier and the drywall.
I decided to put it on the inside wall since I will be adding resilient channels as well (between the vinyl barrier and the drywall).