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Speaker (audio equipment) - Wikipedia
https://en.wikipedia.org/wiki/Speaker_(audio_equipment)
Among audio equipment, a speaker (also sometimes called a speaker driver or, especially if audible at a distance, a loudspeaker) is an electroacoustic transducer, that is, a device that converts an electrical audio signal into a corresponding sound. A speaker system, also often simply referred to as a "speaker" or "loudspeaker", comprises one or more such speaker drivers …
Audio crossover - Simple English Wikipedia, the free ...
https://simple.wikipedia.org/wiki/Audio_crossover
Audio crossover is an electric circuit that separates low and high audio frequencies in a signal. It is needed because very small loudspeakers ( tweeters) would break if fed by low frequencies. Likewise, bigger speakers ( subwoofers) are not able to play higher frequencies purely. Audio crossovers are divided to passive or active crossovers.
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