The difference between a speaker and a audio speaker - what is an audio speaker
1. Magnetic audio speaker: an electromagnet with a moving iron core between the poles of a permanent magnet, when there is no current in the coil of the electromagnet,the movable core is attracted by the phase grade attraction of the two poles of the permanent magnet and remains stationary in the center. The movable core is magnetized and becomes a strip magnet when an electric current flows through the coil. With the change of current direction, the polarity of the strip magnet also changes accordingly, so that the movable core rotates around the fulcrum, and the vibration of the movable core is transmitted from the cantilever to the diaphragm (paper basin) to promote the air thermal vibration.
2.Electrostatic audio speaker: it's the use of the electrostatic force added to the capacitor plate and work speaker, on its structure, because of the positive and negative poles face each other into a capacitor, so it's also called capacitor speaker. There are two thick and hard plates which are used as the stationary plates, through which sound can be transmitted, and a thin and light material (such as aluminum film) is used as the diaphragm in the middle plate. The diaphragm is fixed around and tensioned at a considerable distance from the fixed pole, so that it will not collide with the fixed pole even on the large diaphragm.
3.Piezoelectric audio speaker: the audio speaker that uses the inverse piezoelectric effect of piezoelectric material and works is called piezoelectric speaker. Dielectric (such as quartz, sodium potassium tartrate and other crystals) under the action of pressure polarization so that there is a potential difference between the two ends of the surface phenomenon, known as "piezoelectric effect". Its inverse effect, the elastic deformation of the dielectric subjected to an electric field, is called the inverse piezoelectric effect or electrostriction.
Above is the kind of audio speaker and its working principle, at present use more is electric audio speaker, its electroacoustic conversion efficiency is high, and conversion quality is better, high fidelity.