The Wall Damp system helps to tame low frequency reverberation in the room by turning the walls into membrane bass traps. It makes the wall about 1" thicker, not just because of the double layer of sheet rock with the damping material in between, but also because of the resilient channel used to decouple the sheet rock from the studs, allowing the sheet rock to flex. You get quite a bit of low frequency absorption for the cost of 2" off the width and depth of the room, and just 1" off the height of the room if you do the ceiling too.
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