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I am going to build a 23’x32’x8′ music studio/home theater underneath our suspended garage. The area is concrete on 6 sides, (foundation walls 10″ thick on all 4 sides, 4″ thick concrete floor and 10″ thick concrete hollow core slabs above our heads (these are hollow core slabs, not concrete poured over metal decking)), it is literally like being inside a concrete cube. I am not worried as much about sound transfer as I am reverb coming back through the walls bouncing off of the concrete foundation walls. I am not able to hang drywall on both sides of the perimeter walls as they will be built close up against the foundation wall leaving an approximate 1″ air gap between the stud wall and foundation wall. I cannot find an STC rating or any info on a 1 sided drywalled wall anywhere. I am planning on using either 2×4 wood studs or 25 ga. 3 5/8″ metal studs, either one is fine with me. Insulating with an R-13 batt, and hanging 1/2″ or 5/8″ drywall on the interior side, also either one is fine with me. I don’t want to use any kind of mass vinyl product due to the idea of trapping moisture within the walls. I am looking for the highest possible STC rating but making sure I don’t have a problem with reverb or mold when this is all done. Maybe the 1″ air space between the foundation wall and stud wall will kill off the reverb, but I don’t know. Please help me with the best solution for this problem.