Subwoofer speaker system

Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing

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381 87, 381117, H04R 1302

Patent

active

045647275

ABSTRACT:
A method and apparatus for producing low frequency sound (20 to 100 Hz) at levels of intensity above the minimum threshold of human hearing. A mechanical-electrical drive having high power capacity is coupled via a linkage to a sound radiator and is responsive to the electrical input from a sound program source. The drive is capable of large excursions at high forces which are substantially constant irrespective of the extent of excursion.

REFERENCES:
patent: 2926221 (1960-02-01), Kagdis
patent: 3855487 (1974-12-01), Boisseau
patent: 3937887 (1976-02-01), Miller
patent: 4295006 (1981-10-01), Tanaka
J. S. Swartz, "Commutated Voice Coil," IBM Tech. Disc. Bull., vol. 21, No. 11, Apr. 1979, pp. 4636-4637.

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