Loudspeakers use both electric and mechanical principles to convert an electrical signal from an electric musical instrument into sound. For a loudspeaker to produce sound, the signal needs to be connected to an electronic amplifier.

Loudspeakers are usually built by using stiff paper cone, a coil of thin copper wire, and a circular magnet. The cone, copper wire, and magnet are usually mounted in a rectangle-shaped wood cabinet. The coil of copper wire and the magnet cause the rigid paper cone to vibrate and reproduce sounds.

Some loudspeakers are designed for lower-pitched sounds, such as woofer loudspeakers or subwoofer loudspeakers. Other loudspeakers, which are called tweeters, are designed to reproduce high-pitched sounds (such as the sound of a whistle or a bird singing).

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