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I am in the building field and I have seen good success with engineered drywall products like Silent Fx. The blocking of very low frequency sounds still benefit from additional means like decoupling (stagger the studs or resilient channel ) or additional mass (another layer of drywall). But for most uses, media rooms, inhome studios, this type of product on both sides of the studs is commercial level control. http://www.certainteed.com/Products/340906