Role of speakers in audio equipment

The speaker is one of the most weak parts in the audio equipment, and it is one of the most important parts for the sound effect. There are a wide variety of speakers, and the price is very different. Audio power through electromagnetic, piezoelectric or electrostatic effect, so that the paper bowl or diaphragm vibration and resonance with the surrounding air resonance (resonance) and sound, speakers are divided into a built-in speaker and external speakers, while the external speaker that is generally refers to the speaker. Built in speakers is the MP4 player with a built-in speaker, so that the user can not only through the headphone jack can also listen to the voice of the MP4 player through the built-in speaker.