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Get your car rockin'! Buying a new car? If you want to install a custom stereo system, you will need another power source besides the head unit (the CD player or tape player in older cars). Amplifiers power the speakers and come in a variety of power and channel configurations.
A channel is basically one power outlet per speaker. Amplifiers (or amps as they are also called) have anywhere from two to six channels. If you have a subwoofer, you may want to consider installing a separate amplifier off which to power the subwoofer.
*You should plan to spend anywhere from $150 for a basic amplifier to $1,000 for an amplifier with the greatest amount of power and number of channels.