1. more expensive than framing a second wall and drywalling it (2x4's are cheap, and gyp board is like $4.50 for a 4'x8' 1/2" sheet vs $10-$20 for a plywood sheet)
2. very reflective. You'd probably get better results investigating some of the sound deadening products, but honestly I don't know how well it will reduce transmission...there are a lot of factors at play here and retrofitting an existing wall generally doesn't yield great results.
I built a false wall , that way you have access to everything, in addition, the false wall (drywall) reduces most/all transmissions from the back wall. This can be good and bad..since I now notice slight directionality of my subs.
Are you in Las Vegas? You can swing by my place if so and see what i did
You really don't need a double wall. A staggered stud wall will do the trick and only adds 2" to the thickness. This is what I will be doing with my limited space. Double drywall is cheaper and better for sound than plywood, or better yet, sound board, which is pretty cheap too.
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