Tricky question Gr8wight , hard one to answer since I have never been standing beside myself during an experiment . That's why I've had difficulty wording a description .
I know that there is some type of pressure wave . I attempted it once with an ear infection and the pain was excruciating in my blocked ear .
From my point of view it sounds a bit like a massed choir in a cathedral performing a gregorian chant .
During one experiment , I positioned a friend who had accompanied me , at the sweet spot in the chamber, and focused the sound on them .
They described how they could feel the sound spiral down from above . They also felt a sense harmony within themselves .
If you are really interested ,see if you can get good old Jimmy to organise a bit of a party one night in the pyramid at Cheops .
Im getting a bit old now and my voice is getting a bit weak ,so I could do with a couple of back up singers , a sorprano , and a tennor would be handy . I'll handle the bass .
Probably need a few bob for expenses , couple of airline tickets , a bit of nice luggage and a crisp new suit .
Whata ya say Gr8 ........could be fun.