Acoustics – Diaphragm and enclosure – With horn
Patent
1983-04-29
1987-01-13
Gellner, Michael L.
Acoustics
Diaphragm and enclosure
With horn
H05K 500
Patent
active
046357491
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a loudspeaker horn, and in particular (although not exclusively) to a a low to mid frequency loudspeaker horn for public address, theatre and band uses.
In applications where it is necessary to provide low to mid frequency sound at high volumes, such as in public address, theatre and band uses, it has been a problem to provide a sound output having an even dispersion over the entire frequency range in the vertical and, particularly, in the horizontal plane. Various types of horn enclosures have been used to control the sound emitted from the loudspeaker cone, and in particular it has been common to use exponential horns and hyperbolic horns. The exponential horn lacks a control throat in the horn and gives a very high dispersion of sound at low frequencies while being very directional at high frequencies. Hyperbolic horns also have very directional high frequencies and tend to spit out the sound rather than dispersing the sound uniformly in a pleasant manner. To overcome these difficulties with the highly directional sound emitted from exponential and hyperbolic horns toward the upper end of their range, it has been common to use the low frequency units with a relatively low crossover frequency, for example five hundred, eight hundred or twelve hundred Hz, so that the mid-range frequencies are handled by the high frequency unit. This has the attendant disadvantage that the high frequency unit must be much larger and must have a higher power handling capacity than would otherwise be required with a higher crossover frequency. Alternatively, because the high frequency unit is of a light construction to give the required high frequency response, it tends to burn out very quickly from having to handle the comparatively low mid-range frequency imposed by the crossover.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a loudspeaker horn which will obviate or minimize the foregoing disadvantages in a simple yet effective manner or which will at least provide the public with a useful choice.
It is a further object of the invention to provide a loudspeaker horn which will give an improved horizontal dispersion of sound toward the upper portion of the sound range, allowing a higher crossover frequency that has heretofore been possible.
Accordingly, the invention consists in a loudspeaker horn having a vertical elongate opening adapted to be positioned in front of the speaker cone, the horn incorporating first vertical wall members extending forwardly and inwardly from either side of the opening to a throat narrower than the opening and second vertical wall members extending forwardly and outwardly from the throat.
Preferably, the width of the vertical elongate opening and the spacing of the throat from the elongate opening are designed so that the distance from all points on the cone of the loudspeaker to the throat are substantially equal.
Preferably, the included dispersion angle between the second vertical wall members is approximately 90 degrees.
Notwithstanding any other forms that may fall within its scope, one preferred form of the invention will now be described by way of example only with reference to the accompanying drawings.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional plan view of a loudspeaker enclosure incorporating a horn according to the invention,
FIG. 2 is a frontal elevation of the loudspeaker enclosure shown in FIG. 1,
FIG. 3 is a side elevation of the loudspeaker enclosure shown in FIG. 1,
FIG. 4 is a cross-sectional plan view of a loudspeaker horn according to the invention incorporated into a bass reflex cabinet having a bottom vent.
FIG. 5 is a frontal elevation of the enclosure shown in FIG. 4, and
FIG. 6 is a cross-sectional elevation on the line 6--6 of FIG. 5.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In the preferred form of the invention a loudspeaker enclosure incorporating a horn according, to the invention for use with a 15 inch loudspeaker driver is constructed as
REFERENCES:
patent: 1755636 (1930-04-01), Dubilier
patent: 1878088 (1932-09-01), Zwikker
patent: 1962374 (1934-05-01), Woolf et al.
patent: 3356179 (1967-12-01), Tompkins
patent: 4071112 (1978-01-01), Keele, Jr.
patent: 4138594 (1979-02-01), Klipsch
patent: 4187926 (1980-02-01), Henricksen et al.
patent: 4369857 (1983-01-01), Frazer et al.
Brown Brian W.
Gellner Michael L.
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