I hear what sounds like white noise at a very high frequency when it's completely silent. I sometimes hear an actual tone, but it's not all the time. Sometimes it will start randomly, then fade off. But I always hear the white noise sound. It's not loud enough to be noticeable above anything except complete silence.
I like to think of it as my own personal useless dithering system. If there ever happens to be a technological breakthrough whereupon digital ear implants are used in place of the biological setup we have, then I won't have any problems after converting down to 16-bit. lol... (awkward geek moment)
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