I do experience vibrations in my head but it is not constantly, it comes and it goes. Mine seems more like a subtle vibration, it's hardly tangible on the outside and when there's less background noise, it gets a bit louder.
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Mine isn't constant either. I have spent quite some time to confirm mine is external. Sometimes it is inaudible but still cause discomforts.
Tangible as in being able to feel the sound and where it is coming from.
That's a great start, hope you find and understand more about it.