I also heard years ago that high volumes of truly subsonic frequencies would make people deficate involuntarily. I know one thing......................the so called 'J' wave or subsonic wave that precedes a large earthquake by a few milliseconds was absolutely terrifying during the big earthquake of 1989 in Santa Cruz. My wife and I were about 5 miles from the epicenter at a very crowded outdoor coffee shop when that wave came through. Talk about the Dubharmonics of God!!!!! It was so frightening. Of course, the collapsing buildings, exploding plate glass windows and screaming, panicky people didn't help the situation at the time either). I love bass and especially subsonic bass but I never want to hear that sound again. Ever! r.