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 dimension of the membrane strongly conditions the functioning of the loudspeaker. The greater the dimension of the membrane and its mass, the smaller its resonance-frequency, which in turn implies that large membranes are ideal for reproducing low frequencies, whereas they are quite useless for the reproduction of high frequencies.
Seeing that each loudspeaker reproduces a certain frequency band at its best, in order to reproduce the entire audible-frequency spectrum (20Hz - 20KHz) it becomes necessary to use more than one loudspeaker at a time
HowStuffWorks "How Speakers Work" The best amplifier, receiver and CD player won't do you much good, if you don't have good speakers. Speakers are the final step in the stereo process -- the key component that turns electronic data into sound.
Frequency Range of Human Hearing This is a page in The Physics Factbook™ — an encyclopedia of scientific essays written by high school students that can be used by anybody.
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