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I have an audio interface: a Focusrite clarett+ 4pre. When it is NOT connected via USB to the computer, but connected to the same power filter (computer is grounded, focusrite has no ground contact), I start hearing high frequency random noise (not white noise, but something more crunchy, like random peaks at some frequencies). Thanks for your reply!

Phases are correct.

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  • Can you clarify, if the computer is turned off, there's no noise from the Clarett? Can you explain what you mean by "computer is grounded, focusrite has no ground contact"? Oct 28, 2023 at 4:45

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