I have a brand new DAC2 Pro and an Rpi4. When I plug my headphones into the DAC's headphone amp, there is a constant noise of static in the right ear. It's there no matter what the software is doing (playing, not playing, rebooting, etc) and changing the master volume or other volumes has no effect on it.
What is causing it or what can I do to get rid of it?
Thanks for any insights.