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it produces. The air inside the chamber has its own resonances, and these interact with the resonances of the body, altering the resonances of the instrument as a whole. The sound box typically adds
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enclosure. However, in these cases the box resonance is carefully tuned so as to make the sound more equal across frequencies, rather than to impart a particular character to the reinforced sound.
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Springer
Publications, 2007, p. 582 "The use of a resonant air cavity to boost the low-frequency response has been a common feature of almost every stringed instrument from ancient times."
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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
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have at least one open end of the sound box covered with animal skin (or a skin-like acrylic material). Open back banjos are normally used for
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are also mounted on a sound box to enhance their output, particularly bass speakers. One notable example of this arrangement is called the
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