Infrasound facts for kids
Infrasound is a type of sound with a frequency lower than humans can hear. This frequency is lower than 16 hertz. When the frequency is lower but the volume is loud enough, humans can feel the vibrations but cannot hear the infrasound. Younger people have the ability to hear lower and higher frequencies. Some animals including whales and elephants can communicate long distances by infrasound.
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Patent for a double bass reflex loudspeaker enclosure design intended to produce infrasonic frequencies ranging from 5 to 25 hertz, of which traditional subwoofer designs are not readily capable.
Infrasound Facts for Kids. Kiddle Encyclopedia.