Yep, and in a quiet environment like I have, I can hear it all day, and it gives me a headache.
In the interests of some more data that others might find interesting, here's another image, zoomed in a bit on that 1kHz to 4kHz range. You can see how some of the traces are actually two signals, really close together. One could conjecture about dual fans and alignment, or lack thereof.
And here's something else. In the full range image in my previous post you can see what looks like a hard line at around 23kHz matching up with the startup and shut down. The following image is a much closer look. There's quite a bit going on up there...
In the end, it's all academic at this point, because despite escalating to Apple Engineering and providing them with a bunch of data mapping out the frequencies (including images like those above), recordings of the noise itself, even isolated samples of the noise and all related harmonics, the answer came back from Engineering that all of it is "expected behaviour", and a replacement unit would not necessarily perform any differently.
People will of course draw their own conclusions from that.
