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What is a Computer Speaker?
http://www.hardwaretipsandtricks.com/articles/27/1/What-is-a-Computer-Speaker/Page1.html
By Super Admin
Published on 11/21/2006
 
Computer speakers, or multimedia speakers.

Computer speaker

Computer speakers, or multimedia speakers, are external speakers and are usually equipped with a male-end stereo jack plug (usually color-coded green) for computer sound cards; however, there are some that have female RCA connector, and some people link computer sound cards to nearby stereo systems. There are also USB speakers which gain their power from the 5 volts of a USB port. Computer speakers are usually a simplified stereo system without a radio or other media sources built in.

Computer speakers range widely in quality and in price. Typically, the simplest computer speakers come with computers. There are also advanced forms of computer speakers that have graphic equalization features (bass, treble, etc.) for dynamic audio flexibility.

Common options
Speaker options vary between manufacturers, but typically they may include any or all of the following in addition to the standard features:

An LED, typically green, that acts as a power indicator.
A 1/8" or even 1/4" headphone jack.
Dials or buttons for volume, bass, and treble.
A wired or wireless remote control for volume and power control

Major computer speaker companies
 
Altec Lansing
Bose
Creative Labs
Cyber Acoustics
Dell
GE
Harman Kardon
Hewlett-Packard
JBL
Klipsch
Logitech