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You can visit the following web site

http://electronics.howstuffworks.com/speaker.htm

How Speakers Work
by Tom Harris

Inside This Article
1. Introduction to How Speakers Work
2. Sound Basics
3. Differentiating Sound
4. Making Sound
5. Making Sound: Diaphragm
6. Making Sound: Voice Coil
7. Making Sound: Magnets
8. Driver Types
9. Chunks of the Frequency Range
10. Sealed Speaker Enclosures
11. Other Speaker Enclosures
12. Alternative Speaker Designs
13. Lots More Information
14. See all Home Theater articles