Audio amplifiers are installed within a vehicle in order to modify audio frequency signals generated by the vehicle's sound system. With such car amplifiers, audiophiles can continue listening to high-fidelity sound reproductions of music and speech, even while traveling in their automobiles. An audio speaker is a device that receives a signal and produces sound. The signal received by a speaker typically, but not necessarily, is an electric signal produced by an audio amplifier. The speaker receives the amplifier signal and produces vibrations which produce sound. Many power amplifiers provided in audio units, including car radios and cassette players, generally operate as class B amplifiers or as class AB bridge circuits. Loudspeakers and amplifiers that drive them are typically located at different locations in vehicles, such as in trunks, compartments near the vehicle rear, in doors, etc. In sophisticated audio systems, the audio amplifiers are typically mounted at some distance (e.g. the vehicle trunk) from the dash-mounted head unit or source unit of the sound system. The amplifiers are typically grounded locally to the vehicle chassis. High power audio amplifiers are frequently added to an automobile entertainment system to amplify the audio output from a radio mounted in the car. These high-power amplifiers are usually housed in a chassis or enclosure different from the radio, and they are frequently mounted in a location that is not near the radio. Automotive sound systems present difficult signal transmission problems due to the electrical noise potentials (i.e. unwanted voltages) generated in the vehicle chassis by the many electrical systems distributed throughout the vehicle. As a result, sound quality is deteriorated. Thus, it is required to cancel the noise on the way to the audio power amplifier.
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