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

Sounds that are below the audible hearing range; typically below 10 or 20 Hz. Contrast with ultrasonic.