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The speaker is a very common electroacoustic transducing devices, we can see it in electronic circuit which can make a sound. The speaker is one of the most weak devices in electronic components, and for the stereo effect, it is one of the most important devices.
We have many different kinds of speakers, and the price vary considerably . Audio power make a sound by cone or diaphragm vibrate and resonate with the surrounding air through electromagnetic, piezoelectric and electrostatic effect.
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