I did notice it on my new MBP now also, did not notice it in the beginning but my does not sound that high.
But I'm starting to think it's from the speakers so I'll just wait for 10.12.4 and hope that's a fix for it.
No way that this is so widespread and that it's a hardware defect - it's to many effected by this.
Also everything else is great with my new MBP that I did get replaced so I don't want to take the chance to replace it again due to this little issue that I'm thinking is Software related.
I got 3 years of warranty from my AppleCare so I'll just wait and se.
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I'm thinking the same way. I do have some thoughts that this maybe are a software bug, see my answer above.
It's not coming from the speakers. You can feel the click when moving the display, which wouldn't occur if it was coming from the speakers.