1) The Low bass bowel movment myth was busted. The Myth Busters did that one on TV a while back Completely encased the guy inside of four walls of speakers and ran the system producing frequencies from 10 Hertz to 100 hertz at 130DB with no physical effect. (he didn't crap his pants) LOL
2) In one small venue from the time I start until the time I am finished the volume level never drops below 115 DB, it is an awesome show for it's size.
At another venue (mid-size) if you want to talk you will have to go outside.
Yes I use the power I carry.
1) Actually it's not a myth, they just used the wrong guinea pig. It is not uncommon for some seniors to develop a variation of Menier's (sp?) Syndrome called Tulio's Syndrome. Certain sounds can cause dizziness, nausea, those loose bowels, and even rage...and unless they have an excellent doctor, most go undiagnosed or mis-diagnosed. I have a version of it-certain vacuum cleaners and leaf blowers can can make me angry, but I've learned to control it.
2) We have different philosophies regarding volume. I generally set up for sound to fade toward the back of the room, enabling those not singing or watching to engage in conversation.
.....and at half a century, I'm still in puberty....