Humming noise when recording system audio

[Ceglany]

Hi,

Every time I try to record something, there is a humming noise on the recordings. I can't find threads with similar problem.
Log file: https://obsproject.com/logs/kci0kk_YgfxGGpPn
Sample file: https://easyupload.io/1qggn6

This sound exist even when my headphones are far from mic.

 

[Ceglany]

Oh, I found the reason.
Signal enchancements option was checked. There is no humming after disabling.