An amplifier or simply amp, is any device that changes, usually increases, the amplitude of a signal.

The following site, I’m telling you is the most complete site discussion amplifier especially car amplifier e.g. video guide on car amplifier installation (give examples of amplifier installation types and suggested system layouts), general amplifier installation tips, how suppressed noise on an amplifier, and amplifier (detail schematics showing electrical connection and cable wiring harness of radio receiver, speakers, battery/ power source, ground point, subwoofer, fuse and capacitor).

Herein this site also discussed how to diagnose noise problems and cure the most common noise problems associated with outboard amplifiers.

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