The speakers in your stereo contain magnets. The speaker consists of a stationary magnet in a metal frame, a paper diaphragm and a wire coil molded into the diaphragm’s center. When an electric current flows through the coil, magnetic forces between the coil and the stationary magnet make the diaphragm vibrate in and out. The vibration produces the music you hear. Almost every kind of speaker has a magnet, from tiny earbuds to large loudspeakers.
