Originally Posted by Creeping Death
Yes, and my brother hears it as well. Funny, support asked me the same question. I don't think it should be designed so you need to have hearing damage to not be annoyed.
It's not really hearing damage per se, it can just be natural.
Pretty much only children/teens, maybe some young adults can hear 20-20k. Hearing degrades as you age, nothing you can do about it and it happens to everyone. It does degrade at different rates, dependent on genes, lifestyle, etc.
This is why they had designed those 18k-20k ringtones that only kids can hear (not adults).
Remember, back in the dark ages, or caveman era, not only were there no loud sounds ('cept for thunder), but the average lifespan was 1/2 of what it is today, if that. Evolutionary wise, it's not a big deal that the super high freq's start to be hard to detect as we get older. Human speech only goes up to about 7k at the most, and it's really pinpointed around 1k-2.5k.
Anyway, the ability to hear up to 20k can be diminished as early as 20 years old, even if you lived in a cave all your life. Some aren't even born with the ability to hear that high also.
Point being (gosh, get to the point already!), the CW whine you hear is probably up their freq wise, 12-15k, or higher. And even if it is low in level, you might hear it, but it might be too low in level for most other adults to hear it. If it was maybe 10-20db louder, the whine might then become audible to others.