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absorbing low freq - cuts boom outside room also?

:confused: I have just recently built a project studio in a 2000 sqr/ft lot. The partition wall between my studio and the shop next (I am in a strip mall ) was said to be 14" wide - staggererd studs 5/8 drywall with insulation. To achieve an STC of 55 we built on accordingly. As it turns out the wall between me and the next door is roughly 8" - not on staggered studs but with insulation.