лол тем временем в блоге у самого Раймонда Чена _музыковэды_:

I did analyze the frequency spectrum using Audacity and the most prominent peak is at 84⅛ Hz, which is a smidge higher than E2 on a piano. As it happens, 5400 Hz is a smidge higher than E6 (you’ll need an extended 108-key keyboard for that one). Being the same note, six octaves apart, I have to admit that if any song is going to cause problems due to resonant frequencies, Rhythm Nation would be it.

отакото товарищи, а вы думали.

диски со скоростью вращения 5400 Гц, 7200 Гц и 10000 Гц.

и 15000 Гц в категории HiFi диски с высокой верностью воспроизведения битиков.