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Ground Loop Break (GLB - TI
https://www.ti.com/lit/pdf/sloa143
The resistance inserted in series with the audio cable shield is called a "ground loop breaking" resistor, Rgbk. (More properly it’s a "ground noise reduction" resistor, but "ground loop breaking" is a more popular and familiar description.) The resistor can be inserted at either the source or the receiver, so it is necessary to consider both cases.
Avoiding ground-loop induced hum in audio connections
http://www.channld.com/hum.html
This is done simply by inserting isolation resistor(s) in series with the audio cable ground(s). A usual value for the resistor is 10 to 100 ohms. Note that all signal ground connections between audio equipment must be isolated. [A smaller, 10 millivolt ground return potential difference translates to an insignificant (in properly designed audio circuitry) 100 microamp loop current, …
Ground loop breaking resistor | diyAudio
https://www.diyaudio.com/community/threads/ground-loop-breaking-resistor.157060/
Both of the grounds of the computer and the speaker are earthed, which introduces a ground loop. Sometimes the current in the loop can cause the shield of the interconnect cable to go really hot. and it introduces humming. To solve the problem I added a 10R resistor in series with the interconnecting cable's ground line.
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