ANSWERS: 2
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large powerful speaker that just pumps out bass, basically. its what makes the thumping you hear from some vehicles cruising around.
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A subwoofer is a type of driver dedicated to the reproduction of bass frequencies, typically from about 20 Hz to perhaps 200 Hz in cone speakers, and in the case of a rotary woofer, all the way down to below 1 Hz. It is difficult for small loudspeakers in typical enclosures to reproduce frequencies below about 40-50 Hz, especially at high output levels (say, above 100 dB), as their cones must move farther than any practical driver construction can manage, and so it is often advantageous to use a loudspeaker specifically designed for handling low frequencies at high power levels. source wikipedia.
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