Audio4c noise floor

I hear a distinct background noise with my new Audio4c. Only the power supply and the headphones are connected. I can not explain this, since it is praised in comments and tests in this regard. Connected to the PC, the noise remains, even a reset did nothing, the software is up to date. With my Steinberg UR22mk2 I hear no noise at all with the same headphones. However, that does not require a power supply.
Is the noise normal?

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