A subwoofer (or sub) is a woofer, or a complete loudspeaker, which is dedicated to the reproduction of low-pitched audio frequencies known as bass. The typical frequency range for a subwoofer is about 20–200 Hz for consumer products, below 100 Hz for professional live sound, and below 80 Hz in THX-approved systems. Subwoofers are intended to aug...
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http://en.wikipedia.org/wiki/Subwoofer
(from the article `loudspeaker`) ...speaker is called a woofer, and the high-frequency speaker is called a tweeter. In many sound reproduction systems a third, or midrange, speaker ...
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http://www.britannica.com/eb/a-z/s/179
A speaker dedicated to producing powerful low frequency sounds - that's bass to you and me! DVDs with Dolby Digital 5.1 or DTS 5.1 soundtracks are encoded with a Low Frequency Effects channel especially for those trouser-flapping explosions, seismic spacecraft, rumbling thunderstorms, etc.
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A speaker designed specifically to reproduce low-frequency information, usually between the range of 20 to 120 Hz. Dolby Digital soundtracks provide a separate low-frequency effects (LFE) channel specifically for playback over subwoofers.
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A speaker designed to reproduce very low bass frequencies, usually those below about 80 Hz.
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http://www.encyclo.co.uk/local/21058
A low-frequency speaker fed by both left and right channels for bass sound reproduction. It relies on the human ear's inability to distinguish the directivity of low-frequency sounds.
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http://www.sony.co.uk/glossary/ShowGlossary.action?site=odw_en_GB§ionty
A speaker designed exclusively for low-frequency reproduction. See also: Loudspeaker.
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https://www.encyclo.co.uk/local/20687
A speaker specially designed to reproduce a range of very low frequencies only (the bass). The typic
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https://www.encyclo.co.uk/local/22369
a loudspeaker component designed to reproduce only extremely low bass frequencies, generally below 125 Hz.
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https://www.infoplease.com/dictionary/subwoofer
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