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... get very loud, they can negatively impact the upper frequencies," says Mark Holden, principal at Jaffe Holden in Norwalk, Conn. Certain construction materials - especially widely-used, single-layer gypsum drywall - can turn into virtual loudspeakers ...



via Norwalk Newswire http://www.infocomm.org/cps/rde/xchg/infocomm/hs.xsl/41254.htm