Baffle vibration reducing

Electrical audio signal processing systems and devices – Having non-electrical feature – Loudspeakers driven in given phase relationship

Reexamination Certificate

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Details

C381S182000, C381S162000, C381S186000, C181S145000, C181S163000, C181S209000

Reexamination Certificate

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06985593

ABSTRACT:
A vibration reducing apparatus comprising, a baffle subject to vibration, a first electroacoustical transducer characterized by a first mass seated in the baffle, a second electromechanical transducer mechanically connected to said first transducer or said baffle in the vicinity of the periphery of the first transducer. The rear sides of the diaphragms of the first and the second transducer are not connected to the listening area. The first transducer and the second transducer are constructed and arranged to receive a common electrical signal so that the movable element in the first transducer and the movable element in the second transducer move in phase opposition in response to the common electrical signal to significantly reduce the vibrating force imparted to the baffle.

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D.B. Keele, Jr., “KEF Reference Series Model Four Speaker,” Audio, Jun. 1996, pp. 50-55.
http://www.linkwitlab.com/woofer.htm, (Aug. 11, 2003).

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