Huh? Read first 2 \ufffd, one more time.
I *SAID* that 54 Hz was about the anal sphincter. "On down" MEANS:
Yes you must go lower to kill, though even 54 WILL KILL after sustained high exposure. There can be no *ONE* lethal exact frequency, though 7- 20 hertz is indeed ~the range the French mentioned for 'best results'. Obviously different, size, shape, age carbon units will react according to F=MA.
More detail would need experiment - an obvious difficulty.
As to relevance of the barium titanate folk and their investigations - some I read there, is uncomfortably reminiscent of long pseudo-science papers amongst acolytes. Measuring the energy of chakras .. is just one such phrase. Nothing I saw about 140+ dB audio for nefarious purposes. (And that damn well won't be 'capacitively coupled', either!)
I will accept that resonance implies: you stay at One freq. long enough to see IF it's doing the job. So a merely continuous-sweep gen, isn't a likely effective mode. But there is no "13.10371" Hz magic death frequency, however romantic be the idea.
(Hey I'm an Ex- audio consultant too - Marantz, Crown, Revox, Infinity yada yada. They paid me $ too. None of that lore scales well to *this topic*, y'know?)
A.