One layer of Supress Sound-Engineered Drywall provides the acoustical performance of up to eight layers of standard drywall, according to the manufacturer, making it ideal for a range of applications, including multifamily properties and home theaters. The panels require no special tools, finish like regular drywall, and can be installed over existing standard drywall with no demolition. Panels come in 1/2-, 5/8-, 3/4-, and 1-inch thicknesses. 800.456.4061. www.supressproducts.com.