a loudspeaker component designed to reproduce only extremely low bass frequencies, generally below 125 Hz.

sub- + woofer Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
subwoofer (ˈsʌbˌwuːfə)
a loudspeaker for reproducing very low frequencies only

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Cite This Source's 21st Century Lexicon
Main Entry:  subwoofer
Part of Speech:  n
Definition:  a loudspeaker that reproduces the powerful low (sub-bass) frequencies's 21st Century Lexicon
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Example sentences
He'll lie down with his head inches from the subwoofer if a deep soothing beat
  is playing.
There are two speakers in the headrest and a subwoofer buried in the seat.
Outputs for headphones, a record out and an optional subwoofer.
Precise loud speakers, including bottom-mounted subwoofer.
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