I can honestly say I've never heard anything like that outside a recorded tone. Of course if only 2% of people hear it then it's not surprising I'm one of the ones who hasn't. That it has been recorded outside in controlled conditions is fascinating. I'm interested in learning more about this.
Side-note: In the ear tests I could hear everything quite clearly from the bottom to the top, but I found the rumble that begins around 25-30 Hz to be an awesome sound. Thanks for posting this.
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