I need to clarify a couple of things: The sound wave I am detecting and measuring is a Supersonic N wave. More specifically I am measuring the pressure wave (sonic crack) generated when a projectile with a speed greater than 800 m/s hits a paper target. On an oscilloscope the amplitude of this pressure wave is very pronounced. Futhermore, Electronic Targets used in competitive shooting use acoustic sensors to measure time distance on arrival - TDOA Trilateration - Wikipedia time to a very high degree - plus/minus one millionth of a second. Therefore what I am seeking is not out of line.