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Comment on Should speakers hum when they're connected to a stereo, but the volume of is turned all the way down?

I learned a little bit about ground loop and it seems like this mainly happens when you are plugged into power using two different sources? How is there a ground loop when the speaker is connected to the stereo and the stereo is the only thing plugged into power.

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Geometrinen_Gepardi@sopuli.xyz ⁨2⁩ ⁨days⁩ ago
Disconnect all copper input cables from your amp. If the hum stops, it was a ground loop.

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- sem@piefed.blahaj.zone ⁨2⁩ ⁨days⁩ ago
  There are already no input wires (it is using Bluetooth) so I guess it is not a ground loop.
  
  Thank you for the education! I’m assuming that the inputs, if they are grounded, can lead to the ground loop?
  
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