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The Sonic Barrier 3/4" 3-layer composite damping material is a premium acoustic absorption and barrier material. It uses the three layers to achieve excellent reduction of sound energy from the inside of the enclosure to the cabinet walls. An exclusive embossed surface finish helps to trap the acoustic energy into a 1/2" acoustic foam where it is converted to low-level heat. A 1/4" foam layer covered with 1/2 lb. limp copolymer vinyl barrier separates the absorptive layer from the cabinet walls. A very aggressive pressure sensitive adhesive provides easy and permanent installation onto any surface. The relatively thin 3/4" overall thickness provides excellent barrier properties in a compact package. It can be used in small ported enclosures to eliminate acoustic energy, and at the same time prevent vibration from reaching the cabinet walls. It offers the best combination of damping and isolation to be found in a material of its thickness. Sold in 18" x 24" sheets.