Speaker system with folded audio transmission passage

Details Speaker system with folded audio transmission passage Speaker system with folded audio transmission passage

1989-05-18

1990-07-24

Fuller, Benjamin R.

Acoustics

Diaphragm and enclosure

Reflex baffle

181145, 181150, 181154, 181155, 181199, 381 90, 381154, H05K 500

Patent

active

049429396

ABSTRACT:
A loudspeaker cabinet in which an elongated enclosure has a driver mounted internally in one wall thereof in facing, open communication with the exterior of the enclosure and an outlet sound port positioned in spaced relation to the driver in another wall of the enclosure remote from the one wall. An audio transmission passage extends longitudinally at right angles to the axis of the driver and is defined by baffles extending in equally spaced parallel relation to one another to divide the passage into a plurality of communicating folded passage sections extending from open communication with the driver to terminate in the outlet sound port. The total length of the passage through its cross-sectional area is on the order of from 8:1 to 16:1 so that at low frequencies air pulses delivered by the driver will remain in phase throughout the length of the transmission passage.

REFERENCES:
patent: 2031500 (1936-02-01), Olney
patent: 2224919 (1940-12-01), Olson
patent: 2550336 (1951-04-01), Daniel
patent: 2646852 (1953-07-01), Forrester
patent: 2808121 (1957-10-01), Goettner
patent: 3529691 (1970-09-01), Wesemann
patent: 3923124 (1975-12-01), Hancock
patent: 4168761 (1979-09-01), Pappanikolaou
patent: 4173266 (1979-11-01), Pizer et al.
patent: 4593784 (1986-06-01), Flanders
patent: 4628528 (1986-12-01), Bose et al.
patent: 4790408 (1988-12-01), Adair
patent: 4853964 (1989-08-01), Weckler

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