![]() AC power cycles the voltage polarity 50 or 60 times per second, depending on where you live. Audio equipment in home stereo, church, theater, and similar systems can have a 60Hz or 50Hz “hum” produced by the alternating current (AC) power source.Car audio systems often have “alternator whine”, a high-pitched noise sound that varies with an engine’s speed while running. ![]() The type of noise varies by the equipment and system in use: The different grounding points have different resistance, which can mean return current flowing through them can develop a small electrical signal introduced in the audio devices being used. ![]() When audio signal cables such as stereo cables with RCA plugs used between an audio source and an amplifier, small currents may create voltage potentials that can be picked up as noise. Ground loop noise or hum is a common problem in many home stereo, auditorium, theater, or car stereo amplified systems due to having multiple paths with differing ground potential. Ground loop noise and hum also affect video systems, although in that case, the noise often appears as distortion in the video signal.Īny time multiple audio devices are connected with cables there exists a potential for ground loops. They work with line level audio signals via RCA or 3.5mm connectors between a stereo, AV receiver, or car head unit RCA audio outputs and an amplifier that share a common ground for power.
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