Loudspeaker horn

Details Loudspeaker horn Loudspeaker horn

1982-02-23

1983-06-28

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Intensifying horn

181188, 181190, 181192, G10K 1100

Patent

active

043900780

ABSTRACT:
A loudspeaker horn which provides constant coverage angles in both the horizontal and vertical planes and affords proper driver loading and a smooth impedance curve down to the lowest frequencies of operation. The throat entrance of the horn is round, to match the driver exit hole, and the throat section expands exponentially, with substantially straight and divergent top and bottom walls and curved side walls. The throat section joins to a transition section in which the side walls expand outward at a more rapid rate and a central vane is introduced top to bottom that both maintains an exponential flare rate and divides the transition section into two vertical slits. The length and width of the transition section are determined by the upper limits of the frequency range and the horizontal coverage angle. The transition section joins to the wave guide section which has a substantially planar side walls forming a conical expansion wave guide with side angle equal to the coverage angles of the horn. The vertical vane extends into the wave guide section, and the dimension of the vane, transition section and wave guide section are selected so that the exponential expansion is maintained until the point at which the conical expansion rate is slower, at which point the conical wave guide is introduced. The final portion of the mouth may be flared at a more rapid rate to overcome beaming near the lower limit of the horn's range. This more rapid flare section may be constructed as an additional mouth extension so that it may be removed when the horn is used in multiple arrays.

REFERENCES:
patent: 2537141 (1951-01-01), Klipsch
patent: 2690231 (1954-09-01), Levy et al.
patent: 4071112 (1978-01-01), Keele, Jr.
patent: 4091891 (1978-05-01), Hino et al.
patent: 4187926 (1980-02-01), Henricksen et al.

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