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Guitar amplifier
A guitar amplifier (or guitar amp) is an electronic amplifier that amplifies the electrical signal from a pickup on an electric guitarbass guitar, or acoustic guitar so that it can produce sound through a loudspeaker, which is typically housed in a wooden cabinet. A guitar amplifier may be a standalone wood or metal cabinet that contains only the amplifier (and preamplifier) circuits—or it may be a "combo" amplifier, which contains both the amplifier and one or more speakers in a wooden cabinet. Most guitar amplifiers can also modify the instrument's tone by emphasizing or de-emphasizing certain frequencies and adding electronic effects, typically distortion and reverb. The input of modern guitar amplifiers is a 1/4" jack, which is fed a signal from a piezoelectric pickup (usually from an acoustic guitar) or an electro-magnetic one (from an electric guitar).

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