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Hi Paul, as you said, I was able to validate that my psu did not connect the negative rail to earth ground. After taking care of that the ground loop is completely gone. I'll try to open the psu case for a permanent fix and possibly implement a ground lift. Thank you very much for your help...

Hi everyone, I'm new to the forum and recently finished building a power amplifier using a generic module and an old HP power brick (19.5V @ 3.3 Amps). I wanted to share my experience and seek advice on an issue I'm facing. When the power amp is connected to equipment with an audio ground...