Windows or Audio Driver applying Unwanted EQ to recordings made with DAW

[Microsoft Windows]

Windows or Audio Driver applying Unwanted EQ to recordings made with DAWAttached is a screenshot of Audacity Spectrum of the recording of white noise I made in Audacity.As you can see, there is a dip between 600 and 700Hz that looks suspiciously like EQ being applied somewhere, and I don't know how or where to turn it off! Anyone in the audio field knows that white noise should measure flat, with no major rises or dips in it.I have looked in all of my Sound settings, in RealTek, recording, playback, microphones, enhancements are uncheckboxed in all locations.Please help!I record professionall

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