loose bowels and shaken bones
Perhaps combining different sound systems could be interesting
A more potent weapon under development in Russia since the early 1990s is a high powered very low frequency (VLF) modulator. Operating at frequencies below 20 KHz, the device requires a 1-2 meter dish to project a so-called "acoustic bullet." The device was attractive because the power level is adjustable. At low power, the system would cause physical discomfort, while increasing the power could induce nausea, vomiting and abdominal pains. The highest levels can cause a person's bones to resonate, which can be quite painful.