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bass reflex

American  
[beys] / beɪs /

noun

  1. a loudspeaker equipped with a baffle having openings designed to improve the reproduction of low-frequency sounds.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.