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Loudspeakers are also called "horns". It is a very commonly used electro-acoustic transducer device, which can be seen in sound-producing electronic and electrical equipment.

The loudspeaker is a kind of transducer device that transforms the electric signal into the acoustic signal. The performance of the loudspeaker has a great influence on the sound quality. The speaker is the weakest component in audio equipment, and it is the most important component for audio effects. There are many types of speakers and their prices vary greatly. Audio electric energy uses electromagnetic, piezoelectric or electrostatic effects to make the cone or diaphragm vibrate and resonate (resonate) with the surrounding air to produce sound.

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