A sound box or sounding box (sometimes written soundbox) is an open chamber in the body of a musical instrument which modifies the sound of the instrument, and helps transfer that sound to the surrounding air. Objects respond more strongly to vibrations at certain frequencies, known as resonances. The frequency and strength of the resonances of th...
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http://en.wikipedia.org/wiki/Sound_box
(from the article `sound`) The air cavity of a string instrument, such as the violin or guitar, functions acoustically as a Helmholtz-type resonator, reinforcing frequencies ...
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http://www.britannica.com/eb/a-z/s/129
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