GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
Guitar and amp, X-ray. An electric guitar, unlike an acoustic guitar, has no means of amplifying the sound made on its strings. An amplifier (amp) converts the signal sent electrically to it into sound. The circular structure (lower right) is a speaker and above this is a row of buttons, which control volume and various sound effects.
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