Sheetrock is well-known to be fairly resonant, behaving like a struck drumhead. Go to the website of Acoustic Sciences Corp, and check out their wall-damping and isolation products, particularly Wall Damp.
I've been in a room constructed with the ASC products (the Portland, Oregon music room of Audiogon member folkfreak), and was mighty impressed. Rapping the sheetrock walls with my knuckles produced a faint "tick" sound; a regular sheetrock wall makes a "tonnnk" sound.
Wall Damp installed between two sheetrock panels creates constrained layer damping, greatly reducing the sonic signature of the panels.
I've been in a room constructed with the ASC products (the Portland, Oregon music room of Audiogon member folkfreak), and was mighty impressed. Rapping the sheetrock walls with my knuckles produced a faint "tick" sound; a regular sheetrock wall makes a "tonnnk" sound.
Wall Damp installed between two sheetrock panels creates constrained layer damping, greatly reducing the sonic signature of the panels.