That's my point, it's not the frequency that liquifys someone.
You could easily play a 7.1 hz sound on a good thx sub or concert sound system. Simply playing that tone would not liquefy someone.
At the same time, one could play a 6 hz or a 7.3 hz tone at the same power level as this guy did, and it would liquefy someone.
The frequency is the result of a bunch of other variables that are the true drivers of the phenomenon. Power level, physical properties of air and the limits to the power you can couple to it before cavitation and negative pressure regions occurs, resonance, and the geometry of your device. Put that all together, get it ringing, constructively interfering, and it will be at a certain frequency. It's the result of the equation, not the input.
You could easily play a 7.1 hz sound on a good thx sub or concert sound system. Simply playing that tone would not liquefy someone.
At the same time, one could play a 6 hz or a 7.3 hz tone at the same power level as this guy did, and it would liquefy someone.
The frequency is the result of a bunch of other variables that are the true drivers of the phenomenon. Power level, physical properties of air and the limits to the power you can couple to it before cavitation and negative pressure regions occurs, resonance, and the geometry of your device. Put that all together, get it ringing, constructively interfering, and it will be at a certain frequency. It's the result of the equation, not the input.