We're doing some remodeling to create a new master bedroom. We're carving a closet 6 feet wide by 2 feet deep out of the end of an unrelated bathroom and I want good sound insulation between the back of the closet and that bathroom. The drywall guy wants the insulation guy to handle it with some rock wool between the studs. Google suggests that we can do a lot better with QuietRock drywall, hanging the drywall on floating nailers, or at least thicker drywall. Anybody have any real experience with this? This is a small area so I'm not too worried about the expense.