I have some old speakers in the house that I wanted to test. So instead of messing with the real stereo unit from the 80s, I bought a $30 stereo from Amazon, and new speaker wire.

The speakers sound okay, but there's a hum coming from them all the time. Even with the stereo volume knob turned all the way down. Is this normal for stereo systems and I just haven't noticed?

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[–] [S] 6 points 10 months ago (2 children)

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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  • [–] 2 points 10 months ago (1 child)

    Disconnect all copper input cables from your amp. If the hum stops, it was a ground loop.

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  • [–] [S] 3 points 10 months 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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