The loudspeaker has a fabric, plastic, paper or lightweight metal cone at the front of it. The cone’s outer part is attached to the outer part of the loudspeaker’s circular metal rim. The inner part of the cone is fixed to an iron coil which is located right in front of a permanent magnet. When a loudspeaker is connected to a stereo, electrical signals pass through the speaker cables into the coil. The coil then turns into a temporary magnet or electromagnet. As there is a flow of electricity in the cables, the electromagnet either attracts or repels the permanent magnet. The coil then moves back and forward, while pulling and pushing the loudspeaker cone. This moving cone, therefore, pumps sounds out into the air.
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