The electrostatic earphone has a light and thin diaphragm that is polarized by a high DC voltage. The power required for polarization is converted from alternating current and battery powered. The diaphragm is suspended in an electrostatic field formed by two fixed metal plates (stators). When an audio signal is applied to the stator, the electrostatic field is changed to drive the diaphragm to vibrate. A single stator can also drive the diaphragm, but the push-pull form of the double stator is less distorted. Static headphones must use a special amplifier to convert the audio signal into a voltage signal of hundreds of volts, and a transformer connected to the output of the power amplifier can also drive an electrostatic headset. Electrostatic headphones are expensive, not easy to drive, and the sound pressure level that can be reached is not as large as that of a moving coil, but its response speed is fast, it can reproduce various tiny details, and the distortion is extremely low.
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