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A horn loudspeaker is a loudspeaker or loudspeaker element which uses an acoustic horn to increase the overall efficiency of the driving element(s). A common form (right) consists of a compression driver which produces sound waves with a small metal diaphragm vibrated by an electromagnet, attached to a horn, a flaring duct to conduct the sound waves to the open air.
An example of a subwoofer that uses a bass horn is the Bassmaxx B-Two, which loads an 18-inch (45 cm) driver onto an 11-foot (3.4 m) long folded horn. [51] Folded horn-type subwoofers can typically produce a deeper range with greater efficiency than the same driver in an enclosure that lacks a horn. [51]
The LAB Sub, also called the LAB horn, was a heavy subwoofer optimized for operation as four enclosures strapped together in a 2×2 "cube" configuration, to increase the effective mouth size and achieve a low frequency of 32 Hz.
The audio emitted by the speakers is isolated inside an enclosure, aside from a number of outlets that lead towards either a rotating horn or drum. An electric motor rotates both horn and drum at a variable speed. [12] The only control common to all Leslie speakers is a dial that controls the master volume.
The size of the throat, mouth, the length of the horn, as well as the area expansion rate along it must be carefully chosen to match the driver to properly provide this transforming function over a range of frequencies. [a] The length and cross-sectional mouth area required to create a bass or sub-bass horn dictates a horn many feet long.
Multiple-entry horn. The multiple-entry horn (also known under the trademarks CoEntrant, Unity and Synergy horn) is a manifold speaker design; it uses several different drivers mounted on the horn at stepped distances from the horn's apex, where the high-frequency driver is placed. Depending on implementation, this design offers an improvement ...
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