Relief (music)
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Relief, or profile, refers to the amount of curvature in the neck of a guitar or other similar stringed instrument. When the strings of a guitar vibrate, they vibrate in an elliptical shape. Thus, providing the best possible action, requires that the guitar neck have a slight curve to allow the strings to vibrate freely. If the relief is not set correctly, fret buzz may occur.
To provide adjustable relief, most guitars have an adjustable truss rod. Turning the truss rod screw changes the tension of the truss rod, and thus the relief of the neck. Novice players should not attempt this, as the guitar neck can easily be damaged or broken. Some guitars, such as certain older Guild 12-strings, have two parallel truss rods.
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