Loudspeaker having acoustic impedance frontal loading element

Details Loudspeaker having acoustic impedance frontal loading element Loudspeaker having acoustic impedance frontal loading element

H - Electricity

04

R

349/70

H04R 1/28 (2006.01) H04R 1/22 (2006.01)

Patent

CA 1190314

Abstract of the Disclosure An improved acoustic impedance for a direct radiating dynamic loudspeaker having a natural Q greater than about 1.2 is substantially planar and is positioned in front of and covers the projected frontal radiation area of the diaphragm or cone of the loudspeaker. The acoustic impedance element is supported about its periphery and comprises a fibrous felt material having an airflow resistance in the range of about 50-100 cubic feet per minute at .5 psi pressure drop, a density in the range of about 6-12 ounces per square yard, and a thickness in the range of .03-.09 inch. The acoustic impedance element is an air-permeable continuous sheet and is comprised substantially entirely of fibers of synthetic materials, such as, for example, polyester, which are relatively impervious to moisture. The Q of the speaker including the damping element is in the range of about 0.75-1Ø

423711

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