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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British Dictionary definitions for exponential horn
a horn for the radiation of acoustic or high-frequency electromagnetic waves, of which the cross-sectional area increases exponentially with the length
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012