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