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The Sonic Barrier 1-1/4" 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" acoustic foam where it is converted to low-level heat. A 1/4" foam layer covered with 1 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 1-1/4" overall thickness provides the maximum acoustic absorption properties for the highest performance. It is excellent for use in any loudspeaker cabinet, and is perfect for use in most ported systems. The 1" foam layer will act as a conventional high-performance acoustic foam, and effectively absorb reflections from inside the cabinet. This will result a cleaner midrange and midbass, and can increase apparent enclosure volume. At the same time, the heavyweight vinyl barrier and 1/4" isolation foam will prevent the acoustic energy from reaching and exciting the cabinet walls. This material presents an excellent opportunity to improve the performance of any high-end loudspeaker system. Sold in 18" x 24" sheets.