A speaker is a transducing device that converts an electrical signal into an acoustic signal. The performance of the speaker has a great influence on the sound quality. The speaker is one of the weakest devices in audio equipment, and it is one of the most important components for sound effects. There are many different types of speakers, and the prices vary greatly. Audio power passes through electromagnetic, piezoelectric or electrostatic effects, causing the cone or diaphragm to vibrate and resonate (resonate) with the surrounding air to produce sound.