Headphones have a clicking sound

PROBLEM:

This morning my M2 Mac Mini has developed a random clicking sound with my headphones (Bose Quiet Comfort 2).

It's rhythmic and seems to be a regular frequency, albeit it does change every now and then to a different frequency.

I have tried Youtube video, my own videos, and no sound playing, the clicking stays.

WHAT I HAVE TRIED

-Plugging my headphones into my phone and laptop - clicking is gone.

-Tried small cheap JVC earbuds, same clicking, albeit not nearly as frequent or for as long. Normally a few clicks at a time.

-Turned my Mac off/on

-Adjusting the volume

-Moving the Mac position

-Unplugging some cables

Nothing seems to stop or limit the clicking.

Any help would be greatly appreciated as I listen to Binaural Beats for concentration and focus. Another tone being added in really messes with the output frequency and means it doesn't work :)