I agree it could be torture for all sorts of creatures, including small humans. But whether anything is bothered by the sound depends on the energy level and o

I agree it could be torture for all sorts of creatures, including small humans. But whether anything is bothered by the sound depends on the energy level and other characteristics. Spread spectrum ultrasound sonar below the local noise floor may be technically feasible, though perhaps not with regular laptop speakers and audio circuitry.