subsonic is moving below the speed of sound, supersonic is faster than speed of sound
The antonym for subsonic is supersonic.
The term subsonic can refer to speed that's lower than the speed of sound. In computer terms, this could mean an open source media server or refer to programming code.
Subsonic means "slower than the speed of sound" so a subsonic bullet is any bullet that travels slower than the speed of sound.
Subsonic - media server - was created on 2005-02-10.
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Supersonic
Transonic being past the speed of sound and subsonic is below the speed of sound.
Subsonic signals are sounds or vibrations that have a frequency lower than that which may be heard by the human ear as a discernable tone. Vibrations lower than 30 Hz (30 cycles per second) are considered subsonic.
Linked below is the story of one such subsonic passenger jet (a DC-8 in this case) going supersonic. It is well known that the Cessna Citation X, only rated for mach .92 can reach supersonic speeds in a shallow dive. Some pilots have reported achieving this (unofficially of course).
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Subsonic is below or slower than the speed of sound, and supersonic is above or faster than the speed of sound.