Axiom Home Page Forums General Discussion The Water Cooler Fake M80s.....what?

It's unmatched when traveling slower than the speed of sound.

Uh oh, it's pedantic time again. Subsonic and supersonic refer to moving faster or slower than the speed of sound. While infrasonic and ultrasonic reference below and above the hearing range. That's like infrared and ultraviolet, being below and above the visible light spectrum.