Comments on Sonic Cannons

Three types of sonic cannons: Sonic cannons have had three incarnations over the years. The first implementation uses very low frequency sounds (essentially in the octave below the lower note on a piano keyboard) that have a significant vibro-tactile, or " whole body " response. This has been well studied in the literature and can result in nausea, a feeling of fullness in the chest and even heart fluctuations. The literature indicates that the sound level and dose is below that which may cause hearing loss and this is understandable given the human ear's poor sensitivity to very low frequency sound. However, very low frequency (also called subsonic or infrasonic) intense sound is not practical because low frequency sound is non-directional. This means that the user of the very low frequency sound cannon is as much subject to the deleterious effects of the sound as the person or people that the cannon is aimed at. Simply stated, very low frequency sound cannot be " aimed " .