Hi,
Both audio samplers shows the same issue, I don’t think is cable hum or any cable interference, seems like a issue in the circuit. Something goes wrong when Phantom Power is activated.
If you disconnect the cable from the UR22 leaving the Phantom Power active, the noise remains?
Have you tried with a dynamic mic or line/instrument plugged with Phantom power activated, just to test?
To the ones who have the same issue: Where did you bought your units?
I’m almost giving up to purchase one… Maybe is a batch issue… Will give me hard work to exchange (international shipping)…