Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A sound board, or soundboard, is the surface of a string instrument that the strings vibrate against, usually via some sort of bridge. The resonant properties of the sound board and the interior of the instrument greatly increase loudness over the string alone. The sound board operates by the principle of forced vibration; the board is gently vibrated by the string, and despite their differences in size and composition, the board will be "forced" to vibrate at exactly the same frequency, producing the same sound as the string alone, differing only in timbre. Although the same amount of energy is transmitted with or without the board present, the sound board, due to its greater surface area, is more readily able to transform this energy into sound. In other words, the sound board can move a much greater volume of air, therefore producing a louder sound.

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