Weird high noise on left speaker no matter what

a few days ago i started hearing a high frequent noise on the left side of my headphones. i also hear it on my speakers (i have an aux splitter so my speakers and headphones have sound at the same time)

i usually use my internal soundcard but to find the culprit i tried my mic and dac x6 for ruling out the soundcard. the high noise were present on all 3 soundcards.

then i switched out my headphones and the noise is still there.

i also tested it without the aux splitter.

i turned all audio enhancements off and it doesnt matter which format i choose the noise is there.

when i lower the sound to like 40-50% its almost gone, but i cant leave it like that since the volume is too low for the most things

im on a windows 10 system and didnt change anything in the last few days.

I have a windows 11 on another ssd and there is no noise, absolute silence. but i dont want to fully switch yet just because of that.

does anyone know what else to try?
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