High frequency sounds in the power units.

[godlameroso]

The electric drives in these power units give a very audible high pitch wine around 12kHz

https://youtu.be/4mtjC9DozXs
Am I the only one who notices?

[piast9]

I've always thought that it was a turbo whine.

[godlameroso]

It's most noticable in the high gears.

[bill shoe]

That would be a fairly typical blade-pass frequency for a turbo. Not the turbo rotational frequency itself, but the rotation frequency times the number of blades in either the intake compressor or exhaust turbine. I've always assumed the intake was most audible, but I've never validated this.