Static noise when using mic from headphones

[SimonTP]

On my Macbook pro mid-2015(OS X 10.11.6) using my Bose QC35 II and Mumble version 1.2.19 i get constant static noise in my headphones. If i switch from headphones mic to internal mic on my macbook the noise goes away. I have run the audio wizard, but that did not change anything.

Any suggestions on how to fix this problem?

[kissaki]

Do you also hear yourself when you talk, or just the noise?

Do others hear you when you talk with that mic?

[SimonTP]

I dont hear myself and others can hear what i say. I tried using voice through the Battle.net app and that worked just fine no static noise

[kissaki]

Do you have the "Noise Suppression" setting in Mumble enabled? On what value?

Do I get this correctly. With that mic active you hear static noise in your headphone output, so nothing to do with input?

Without Mumble this is not an issue? => then it can't be windows hear what mic hears

Mumble has a setting to loop back input as output, but then others should not be able to hear you.