1. 
   Subwoofer
   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.
   Found op http://www.panasonic.co.uk/html/en_GB/Technology/0-9/217724/index.html
   
   
2. 
   Subwoofer
   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.
   Found op http://www.encyclo.co.uk/local/20523
   
   
3. 
   Subwoofer
   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.
   Found op http://www.sony.co.uk/glossary/ShowGlossary.action?site=odw_en_GB§ionty
   
   
4. 
   Subwoofer
   A speaker designed exclusively for low-frequency reproduction. See also: Loudspeaker.
   Found op http://www.diracdelta.co.uk/science/source/s/u/subwoofer/source.html
   
   
5. 
   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 ...
   Found op http://www.britannica.com/eb/a-z/s/179
   
   
6. 
   SUBWOOFER
   A passive subwoofer is a powerful bass loudspeaker, which stands alone in a box, needing a power amplifier in the equipment to which it is connected. The more common active subwoofer incorporates its own mains-powered amplifier, and takes a signal feed at low level. See woofer.
   Found op http://www.glossarycentral.com/plasma/subwoofer.html
   
   
7. 
   Subwoofer
   A subwoofer (or "sub") is a woofer, or a complete loudspeaker, which is dedicated to the reproduction of low-pitched audio frequencies known as the "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 ...
   Found op http://en.wikipedia.org/wiki/Subwoofer
   
   
8. 
   Subwoofer
   A speaker designed to reproduce very low bass frequencies, usually those below about 80 Hz.
   Found op http://www.encyclo.co.uk/local/21058
   
   

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