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. When is a ground loop isolator recommended?Īn audio ground loop isolator is a type of noise filter used to prevent electrical noise or hum, picked up by audio signal cables along the ground conductor path, from being amplified.Is it bad to use a ground loop isolator in audio?.How much does a good quality ground loop noise isolator cost?.What to look for when buying one with better sound quality.Do ground loop isolators affect sound quality?.Do ground loop noise isolators always work?.The problem may become insignificant somewhere along the way. There should be an improvement with all 3 devices on one charger and further improvements as the number of independent chargers is increased. I mean, you can always try it first and see whether the interference level bothers you. ![]() This is pretty much the same kind of problem you get when using some of these small PC speakers with a 3.5 mm cable for audio and USB for power supply, and plugging both into the same computer. Those are effectively in series with the respective output signal. There must be differences between the ground potentials of each device then. Now since we know that the USB ground potential at the PC and audio ground potential at the mixer are the same for all devices, these differences have got to end up somewhere. This is going to be different for each of them.
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