infrasonic

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infrasonic

[¦in·frə¦sän·ik]
(acoustics)
Pertaining to signals, equipment, or phenomena involving frequencies below the range of human hearing, hence below about 15 hertz. Also known as subsonic (deprecated usage).

infrasonic

Infrasonic refers to sound below the audible hearing range; typically under 20 Hz. Contrast with ultrasonic.