I'm trying to optimize acoustics of my future home theater by maximizing dimensions to minimize standing wave problems. I would like to minimize the thickness of a finished wall consisting of drywall mounted on a basement concrete wall.
I know there are differing thicknesses of drywall, but I'd like to know a range. My understanding is that typically two by fours are used for the framing.
From what I saw in my cursory web searching was that they are mounted on concrete walls sometimes with the shorter two-inch section protruding perpendicular from the concrete rather than the typical free-standing orientation where the longer dimension (3.5") is perpendicular to the wall surface.
In the image below, the top section along the HVAC wall shows the shallower orientation, and the section below that shows the deeper orientation.
Is my understanding correct that the shallower orientation would measure 1 1/2" plus the thickness of the drywall (3/8" or 1/2")?
Is there any drawback to maximizing interior dimensions by mounting the two by fours this way other than it likely disallowing room for running electrical and other wiring?