Soundproofing is a tricky subject.
Soundproofing is done using a rating system called STC. This measures the whole wall system (drywall, insulation, stud etc.)
If you are looking to build a low cost theatre here are some good steps.
Use Roxul Safe and Sound insulation.
Use a product called Resilient Channel in between your drywall and studs.
Use 2 layers of 5/8 drywall. Remember to stagger your seams.
The Quietrock product works but is insanely expensive, labor intensive and the whole 8 equals one is really all marketing as sound is measured by system not product.
If you need more specific help PM me and I can help you would with some more detailed STC construction practices.
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