Mac Rumors covered it in an article on April 28. Here's link to the forum, where the story is the first post.
https://forums.macrumors.com/threads/ma ... e.2343201/
The ring is around 2.2k, but it's not a pure tone.
Here are some YouTube videos showing it:
Spectrum analysis: https://www.youtube.com/watch?v=GO07_k3mors
Spectrogram analysis: https://www.youtube.com/watch?v=KReBC6aujKA
Another spectrogram analysis: https://www.youtube.com/watch?v=AENEKogR1tM
My M1 Max Mac Studio (64GB RAM) has it intermittently. It's not loud, but it's very distracting.
I've reached out to Apple twice, and both experiences were awful.
I took it to the Apple store a couple weeks ago. Long story short, it passed the hardware test, then they wiped the drive and reinstalled the OS. As I expected, this didn't help.
When the Apple tech called me before wiping the drive, I asked "Do you hear the sound?" After hemming and hawing, he said "yes."
But when I picked it up the next day, I noticed that in the work order on the "Genius's" iPad, it said that they'd tested for the sound by playing a YouTube video, even though I'd taken pains to explain that the issue seemed related to the fans and had nothing to do with the speaker.
![Frustrated :banghead:](./images/smilies/banghead.gif)
Today I called Apple and spoke to a "Senior Advisor." Long story short, at one point he said the sound was normal, then a few minutes later he offered to make me another appointment to bring it in again. Huh?
By this time I was so confused by his convoluted attempts to dodge the problem that I didn't think to ask Why are you suggesting I bring it in if the problem is normal?
![Frustrated :banghead:](./images/smilies/banghead.gif)
He said the whine was related to higher fan speeds as a result of more CPU or GPU use, and that the mere act of playing a YouTube video would be enough to get the fans revved up.
![Frustrated :banghead:](./images/smilies/banghead.gif)
That's absurd, of course; I've never been able to get the fans revved up with a DP or Pro Tools Project (though I don't have any particularly demanding ones).
And if he'd paid attention to the videos, he would have seen that the whine occurs at the default speed and lower speeds too.
Anybody have this issue? It's a shame, because absent the whine, the fans are inaudible for all practical purposes.