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Sound box
From Wikipedia, the free encyclopedia
A sound box or sounding box, (sometimes written soundbox), is an open chamber in the body of a musical instrument which alters the instrument's tone quality by modifying the way the instrument resonates. Most instruments respond more strongly to vibrations at certain frequencies, known as resonances. The sound box typically adds one or more resonances at a lower frequency, so enhancing the lower-frequency response of the instrument. The sound box may also modify existing resonances of the instrument.
A sound box is found in most string instruments. The most notable exceptions are some electrically amplified instruments like the solid body electric guitar, and the piano which uses a sound board instead. Drumhead lutes such as the banjo or erhu have at least one open end of the sound box covered with animal skin (or a skin-like acrylic material).
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