Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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 chamber's own resonances supply the reinforcement, and so the tone quality and resonances of the instrument are altered as a whole wherever the chamber's resonances mismatch the chamberless instrument's. The sound box typically adds resonances at lower frequencies, enhancing the lower-frequency response of the instrument. The distinctive sound of an instrument with a sound box owes a lot to the alteration made to the tone. A sound box is found in most string instruments. The most notable exceptions are some electrically amplified instruments like the solid body electric guitar or the electric violin, and the piano which uses only a sound board instead.

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