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How does a soundboard make a stringed instrument louder?
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stringed instrument
A Japanese musician plucking the strings of a koto with the right hand to generate a pitch and pressing the strings with the left hand to alter the tone.
A soundboard increases the volume of a stringed instrument by acting as a resonator that amplifies the faint vibrations produced by the strings alone.12
The process works through the following steps:
- Transmission: When a string is set into motion, its vibrations are transmitted to the soundboard via the bridge, an elastic piece of wood positioned between the strings and the soundboard.13
- Resonance: The soundboard vibrates in response to these transmitted string vibrations. Because the soundboard has a larger surface area than the string, it is much more effective at setting the surrounding air into motion.13
- Amplification: As the soundboard vibrates, it moves the air around it, creating the sound waves that listeners hear.3
The size, shape, material, and thickness of the soundboard are critical, as they determine which overtones are emphasized and define the instrument's characteristic timbre.12