Low frequency loud speaker

Details Low frequency loud speaker Low frequency loud speaker

1988-04-15

1989-08-22

Isen, Forester W.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

181152, 181159, 181194, G10K 1102

Patent

active

048603678

ABSTRACT:
A low frequency loud speaker is disclosed for use in a room at the intersection of two, mutually perpendicular planes, such as a ceiling and a wall, a floor and a wall or two walls. The speaker has a back air chamber within which an electrically-driven diaphragm, centered on and facing a vent cut through the chamber's rear surface, projects low frequency sound waves into the throat of a compact, bifurcated, exponential horn folded around the sides of the chamber to the mouth of the horn at the back of the speaker. The back air chamber receives sound waves from the rear face of the diaphragm and causes these back waves to acoustically activate the air in the vent above and below the diaphragm. The sound waves are projected from the back of the speaker into a space defined by the rearwardly projecting top of the speaker, the intersecting planes and the back of the speaker so that the two planes, the projecting top, the back of the speaker and the outsides of the speaker further improve the impedence match between the mouth of the horn and the room, achieving a fidelity of the low frequencies from 40 Hz to 400 Hz previously found only in corner-placed speakers, where mid-range frequencies suffer, or in speakers of much greater size.

REFERENCES:
patent: 1878018 (1932-09-01), Stephens
patent: 2604182 (1952-07-01), Massa

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