I am considering building my home theater with the room within a room method. When constructing your framing/stud walls of your home theater, and one or more walls are along or next to a concrete basement wall, what recommendations do you have for what to do for the side of the stud wall that faces the concrete, the side you can't see? Do you leave it open to the concrete? Install one (or more) layers of drywall on that side? How does that method effect sound control or acoustics? Thanks!