informal an amplifier
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a piece of electronic equipment that makes sounds louder, used for example with electric guitars or in stereo systems
to put a microphone on someone, so they can be heard or in order to record what they say
a system of loudspeakers used for making announcements in public places and large buildings such as factories
a speaker (=a piece of equipment that sound comes out of) that is designed for high sounds. A speaker designed for low sounds is called a woofer.
a speaker (=a piece of equipment that sound comes out of) that is designed for low sounds. A speaker designed for high sounds is called a tweeter.
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