Mine makes a sound on page turns. It sounds like the standard "electronic white noise" sound to me. Same thing I hear when a TV or a computer is on (although those are much louder than the KT, and in the case of computers, is sometimes drowned out by other electrical noises).
It's the processor doing something. I suspect it's audible because the KT (and the Sony) is so thin.
Although, you guys are describing a different sound than what I hear. I hear more of a high-pitched sound, like a really really quiet version of a hot mike.
I recall learning at some point that the very top of our hearing range fades around 30, and noises like the high-pitched sound I hear from a TV are no longer within hearing range. I'm well below 30. I wonder if perhaps we're hearing the same sound differently.
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