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RE: Less noisy SET headphone amps

This system is made up of a computer and DAC and headphone amp and the computer and DAC are battery-powered. I've tried unplugging the battery chargers and using a cheater plug on the amp but the hum remains. This amp is said to hum generally so I guess I still might have ground loop issues. My subwoofer has a low hum that I can't hear from my listening position and one of the built-in lights here hums.

I'm trying to avoid buying a nice headphone SET amp that I can't listen to because I have a ground loop that I don't want to fix since I'm renting.

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