Acoustics – Diaphragm and enclosure – With horn
Patent
1982-01-27
1983-10-18
Fuller, Benjamin R.
Acoustics
Diaphragm and enclosure
With horn
181156, H05K 500
Patent
active
044100647
ABSTRACT:
The upper peak impedance of a speaker or woofer that is mounted in a base reflex or ported enclosure is dampened by designing the enclosure so that the speaker is mounted in the upper end of a horn formed in the housing, for example, by inclining its front wall to the vertical, so that its upper edge is located closer to the rear wall of the housing than its lower edge. The interior of the housing between the speaker and the housing port thus has a cross sectional area which increases progressively from the upper to the lower end of the housing, and thereby functions as an acoustical transformer, which dampens the cone of the speaker particularly in the area of its upper resonant frequency. Ideally the length of the horn is equal to approximately one quarter the wave length of the sound at the upper resonant frequency of the speaker, but if this is not practical the length can be equal to approximately one eighth the above-noted wave length, provided a fibrous entanglement is mounted in the horn to give the effect of a horn having a length one quarter of the above-noted wave length. The housing and speaker are tuned by adjusting the inclined front wall of the housing.
REFERENCES:
patent: 4138594 (1979-02-01), Klipsch
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