1) A speaker that is designed to reproduce bass frequencies only. 2) A drive unit operating in the bass frequencies only. Drive units in two-way systems are not true woofers but are more accurately described as being mid/bass drivers. 3) Part of a speaker system designed to handle the low frequency parts of the signal.
Found on http://www.testing1212.co.uk/a.htm
(from the article `loudspeaker`) ...so it is customary to divide the frequency spectrum into parts that are reproduced by different kinds of speakers designed for a particular ... ...and linearity of a single speaker cannot be extended over the entire audible frequency range, loudspeaker systems are generally formed from two or ... [... Found on http://www.britannica.com/eb/a-z/w/51
Woofer is the term commonly used for a loudspeaker driver designed to produce low frequency sounds, typically from around 40 hertz up to about a kilohertz or higher. The name is from the onomatopoeic English word for a dog`s bark, "woof" (in contrast to the name used for speakers designed to reproduce high-frequency sounds, tweeter). The most c... Found on http://en.wikipedia.org/wiki/Woofer