a low impedance source driving a speaker with a delta function at the right frequency is very painful.
Do you know any websites that go more into this?
I think I just might have to make a system like this for my security system that Im working on for my house :lol:
Not really, I'm afraid, I found out by experiment my self. When I was in Lab at uni one day, the experiment was a metal detector, we noticed that at certain proximities to metal the audio tone was really quite painful. So we got side tracked for about two hours trying to cause pain (as fun of course). After a bit of probing we found that driving a speaker with a delta function caused the most pain per audible power, if you will. We also found that different frequencies affected different people, a fair assumption to make if you didn't even try it. We made a list of the frequencies that hurt different people and then played "musical chairs" (modified). It soon became less fun when someone on the other side of the room figured out how we were doing it.