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This article was published using Article Submitter The basic construction of an acoustical panel includes a sound-absorbing substrate material and a covering of cloth, vinyl, or other material. The first acoustical panels used in "talking picture" theaters employed wood fiber as the sound-absorbing material. Today's acoustical panels use substrates that are more efficient at absorbing sound and meet modern safety standards. Some panels use two or more substrate layers in one panel to provide special properties. The most widely-used panel consists of a fiberglass board substrate and cloth cover, usually referred to as a POP—a "Plain Old Panel." g e paterson

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