What is a Sub Woofer?
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A subwoofer(or sub) is a woofer or a complete speaker typically between 8 to 21 inches which are dedicated to reproduction of low pitched sound or the bass. Typical frequency range or a sub is 35-200Hz for consumer woofers, blow 100Hz for professional live sound and below 80Hz in THX approved systems.
Subs are used to augment performance of main loud speakers. They are constructed by mounting one or more woofers in well braced wood or plastic enclosure. The are designed using number of speaker enclosure designs like
Each of the above has it’s own advantages and dis advantages. Passive sub is a on which is powered by an external amplifier while an active sub woofer has an an built in subwoofer
Subwoofers use speaker drivers(woofers) typically between 8 and 21 inches diameter.
Source: The Hindu( DT 29 April, Pg:15)