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).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

infrasonic

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