subwoofer

[suhb-woof-er]
noun
a loudspeaker component designed to reproduce only extremely low bass frequencies, generally below 125 Hz.

Origin:
sub- + woofer

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World English Dictionary
subwoofer (ˈsʌbˌwuːfə)
 
n
a loudspeaker for reproducing very low frequencies only

Collins English Dictionary - Complete & Unabridged 10th Edition
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Dictionary.com's 21st Century Lexicon
Main Entry:  subwoofer
Part of Speech:  n
Definition:  a loudspeaker that reproduces the powerful low (sub-bass) frequencies
Dictionary.com'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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