Mash this link for THE MUMMMMMMMMM ...
http://www.youtube.com/watch?feature=player_embedded&v=EuRBM0i8mbI
Sounds like my refrigerator.
She had no idea I played the video. I paused it without saying anything and she said it went away, then clicked on "play" again and she said "There it is again! What is that? Where is that hum coming from?" This is the honest truth.
My 26 year old son just walked in and I clicked on the video. He noticed it. I still can’t hear it. I’m 59.
I could hear it.
There were 2 sounds. One was the low hum and the other sort of sounded like distorted telegraph or radio tuner.
I just listened to the video and I didn’t hear a humming sound. All I heard where clicks or taps, not a continuous sound. I guess my tinnitus blotted it out. :)
I built my house on land that lays in a valley which has a road running down the middle. The underlying rock is limestone, with caves here and there. I can detect the sound of the tread on tires of a vehicle drumming against the pavement more than a mile away. When more than one vehicle is on the road coming or going from my location, the resonant sound is similar to the deeper droning sound of the example from Taos.