Subsonic vs Infrasonic - What's the difference?

As adjectives the difference between subsonic and infrasonic

is that subsonic is having a frequency too low to be audible while infrasonic is having frequencies below the human audible range.

(wikipedia subsonic)

(-)

(of a sound) having a frequency too low to be audible

(of a speed) less than the speed of sound (in the same medium, and at the same temperature and pressure)

(fluid mechanics, of a flow) with a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources).

(en adjective)

(of sound waves, acoustics) Having frequencies below the human audible range

(of a device) Generating or employing such sound waves

* ultrasonic