Speaker profile

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 frequency electric energy through electromagnetic, piezoelectric or electrostatic effect, so that the paper bowl or diaphragm vibration and resonance with the surrounding air (resonance) and sound. According to the mechanism and structure of moving coil (electric), capacitance (electrostatic), piezoelectric (crystal or ceramic), electromagnetic type (spring type), ion electric and pneumatic loudspeaker, loudspeaker has good acoustic performance, firm structure, low cost, wide application according to the sound radiation; the material of paper pot, horn type, diaphragm type; according to the cone shape round, oval, double cone and rubber folding ring; according to the working frequency of sub bass, baritone, soprano, recorder, into some special TV special, ordinary and high fidelity speakers; according to the voice coil impedance points low impedance and high impedance; according to the effect of sound environment and direct radiation. 　　

The speakers are divided into a built-in speaker and an external speaker, while the external speakers are generally referred to as 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. MP4 player with a built-in speaker, you can not connect to the speaker, but also to avoid the long time with the inconvenience caused by headphones.