exponential horn

American  

noun

1. a loudspeaker horn with a cross-sectional area varying as a constant raised to an exponent proportional to the distance from the vertex.

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exponential horn British  

noun

1. a horn for the radiation of acoustic or high-frequency electromagnetic waves, of which the cross-sectional area increases exponentially with the length

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Etymology

Origin of exponential horn

First recorded in 1925–30