Editing Guitar (section)

===Amplifiers, effects and speakers===
[[File:JesseNabers-6.JPG|thumb|right|upright=0.9|A range of guitar amplifiers and guitars for sale at a [[music store]]]]
[[Electric guitar]]s and [[bass guitar]]s have to be used with a [[guitar amplifier]] and [[loudspeaker]] or a [[bass amplifier]] and speaker, respectively, in order to make enough sound to be heard by the performer and audience. Electric guitars and bass guitars almost always use [[magnetic pickup]]s, which generate an electric signal when the musician plucks, strums or otherwise plays the instrument. The amplifier and speaker strengthen this signal using a [[power amplifier]] and a [[loudspeaker]]. Acoustic guitars that are equipped with a piezoelectric pickup or microphone can also be plugged into an [[instrument amplifier]], [[guitar amplifier|acoustic guitar amp]] or [[PA system]] to make them louder. With electric guitar and bass, the amplifier and speaker are not just used to make the instrument louder; by adjusting the [[Equalization (audio)|equalizer]] controls, the [[preamplifier]], and any onboard [[effects unit]]s ([[reverb effect|reverb]], [[distortion (music)|distortion/overdrive]], etc.) the player can also modify the tone (also called the timbre or "colour") and sound of the instrument. Acoustic guitar players can also use the amp to change the sound of their instrument, but in general, acoustic guitar amps are used to make the natural acoustic sound of the instrument louder without significantly changing its sound.