I'm planning on starting my construction in a couple weeks to finish my basement and turn a section of it into a home theater room. In looking at some books on basement finishing pertaining to walls, they all say to attach a top-plate directly to the floor joists above, and then toenail the studs into the top plate (or construct the wall on the ground and raise it up, but still attaching directly to the floor joists). My concern with this is whether this would transmit sound rather freely into the rooms above. I have limited vertical space to work with, and was planning on doing a suspended ceiling already. Is there any other recommended way to put up your walls without having to attach them directly to the floor joists (keep in mind, I only have 7.5 feet to worth with from floor to joists)? Or does this method really not transmit as much sound above as I think it will as long as I double-drywall on top of the studs - hoping the sound will have been filtered out enough by the time it reaches the studs that there won't be much left to transmit into the joists and the rooms above??