Acoustics – Diaphragm – With resonant chamber
Patent
1989-03-15
1991-03-05
Fuller, Benjamin R.
Acoustics
Diaphragm
With resonant chamber
181156, 181199, 381 28, 381 96, 381159, G10K 1102, H05K 500
Patent
active
049970577
ABSTRACT:
An acoustic reproduction range expanding apparatus includes a closed or bass-reflex speaker system which has a low-frequency drive speaker and can reproduce a sound to a predetermined lowest frequeny. A port portion adapter consists of a mounting portion attached to an openng formed in a closed cabinet or a bass-reflex port of a bass-reflex cabinet, and a port portion. The port portion constitutes a Helmholtz's resonator together with the cabinet when the port portion is attached to the cabinet, and has a port shape so that a resonance frequency becomes lower than the lowest frequency. A drive portion adapter consists of an amplifier for driving the low-frequency drive speaker, and eliminates or invalidates an internal impedance inherent to the low-frequency drive speaker. The amplifier generates a negative impedance component in an output impedance.
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"Loudspeakers in Vented Boxes: Part I". A. N. Thiele, Journal of Audio Engineering Society, pp. 382-392, May 1971, vol. 19, No. 5.
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Fuller Benjamin R.
Yamaha Corporation
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