Subsonic
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Subsonic has two possible meanings:
- A speed lower than the speed of sound is called subsonic.
- Sounds that are too low-pitched to be consciously perceived by humans are called infrasound or subsonic. Subsonic sound has an effect on human hearing. The frequency range of normal human hearing is 20-24,000 hertz. Researchers have found that frequences as low as one hertz (one cycle per second) have a definite effect on the inner ear, affecting its equilibrium and causing dizziness.
For an article on the emotional effects of infrasound in music see infrasound.it:Regime subsonico nl:Subsonisch