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How to deal with ground loops in car audio
https://philkotse.com/car-maintenance/how-to-deal-with-ground-loops-in-car-audio-6536#:~:text=A%20ground%20loop%20is%20what%20happens%20when%20two,referred%20to%20as%20the%20whine%20or%20the%20hum.
Amplifiers - Grounding - Cambridge Audio Support
https://techsupport.cambridgeaudio.com/hc/en-us/articles/360000104177-Amplifiers-Grounding
Amplifiers - Grounding. When two or more devices are connected to a common ground through different paths, ground path noise, or a ground loop can occur. A potential difference between these two grounds can cause unwanted noise voltage in the circuit paths. Currents flow through these multiple paths and develop voltages which can cause damage, noise or 50Hz/60Hz …
Ground Loops - hifisonix.com: Audio Amplifier Design
http://hifisonix.com/ground-loops/
If you have a earth loop, then use a ground lifter in the power amp which will essentially accomplish what you are doing, but give you a path to safety ground (ie safety earth) in the event of a catastrophic fault inside the power amp. Seepage 25 in the Ground Loop presentation on how to do this. Importantly:-1.
Ground Loops - Eliminating System Hum and Buzz | …
https://www.audioholics.com/home-theater-connection/ground-loops-eliminating-system-hum-and-buzz
The ground loop can be eliminated in one of two ways: Remove one of the ground paths, thus converting the system to a single point ground. Isolate one of the ground paths with an isolation transformer, common mode choke, optical coupler, balanced circuitry, or frequency selective grounding.
How to Resolve Ground Loop Issues (Hum or Buzzing …
https://support.native-instruments.com/hc/en-us/articles/210293145-How-to-Resolve-Ground-Loop-Issues-Hum-or-Buzzing-Noises-
To check if the amplifier or active monitors create the ground loop, monitor your audio signal from the headphones output of your device (while the amplifier/active monitors are disconnected). If you find the device that introduces the ground loop, a ground lift of the audio connection may solve the issue. Never lift the ground of the power connection!
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