I've been hearing it for about a month. This has never happened before and I'm not sure what to think. It's so clear to me but every time some one is near I say "did you hear that", they look at me like WTF are you on man. I had to quit waking my wife to ask her cause frankly I think it's starting to freak her out.



Same here, sometimes when it gets REALLY loud, i'm looking around to see if I see anything, nothing. And I ask my kid don't you hear that? Nope, I say a loud low hum? Nope, husband doesn't hear it either.

/C