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The function of the loudspeaker is to create sound waves in air that exactly duplicate the complex waveforms and relative magnitudes of electrical currents in an audio circuit. It's the last link in the chain that causes audio information to be transferred from pits on a CD ... or domains on a tape or wiggles in an LP groove ... to the listener's eardrum. It performs this function by passing the audio current through a coil of wire, wound around a magnet to which is glued a large paper cone. When the current in the wire changes, the magnet moves slightly in or out of the coil, in turn moving the paper cone slightly, and causing it to push a bit of air. Doing this fast enough makes a sound wave out of the rapid train of air-pushes. Germans refer to the loudspeaker as the "lautsprecher", while Turks call it the "hoparlor", which they got from the French "haut parleur".

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16y ago

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