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That makes sense. I don't know offhand what the STC of the walls will be, but the construction will be (from outside to inside) 1/2 plywood outside (stucco'ed ultimately), then 2 x 4 studs, then RSIC-1 sound dampening clips attaching to SoundBreak gyp board and then another layer of standard gyp board. We're going to try to stuff r16 insulation in between the studs (even though r13 might be a more traditional choice...
I hadn't realized that frequencies below 125Hz weren't accounted for in the STC rating... That said, I will be treating the inside of the room with some bass control traps, etc., later on, so maybe that will help, too?
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