1. The bottom tone is pure, without any unpleasant "hissing", "weng" and "coaxing" sounds.

2. The sense of balance is good, the tone will not be too cold or too warm, the high, medium and low frequency energy is evenly distributed, and the fusion between frequency bands is natural and smooth

3. High-frequency extension is good, delicate and smooth.

4. The low-frequency response is good, clean and full, full of elasticity and strength, without any feeling of hypertrophy.

5. The mid-frequency distortion is extremely small, full and warm, and the human voice is kind and natural, thick and not exaggerated.

6. Good resolution and rich details, even tiny signals can be played back very well.

7. Good sound field description ability, wide sound field, accurate and stable instrument positioning, sufficient sound field information, and no sense of hollowness.

8. There is no obvious sense of compression in power, and the sense of speed is good. No or very little distortion at high volumes.

1. Static electricity

The vibrating membrane of the electrostatic earphone is light and thin, and it is polarized by DC high voltage. The electric energy required for polarization is converted by AC and powered by a battery. The diaphragm is suspended in an electrostatic field formed by two fixed metal plates (stators). Electrostatic headphones must use special amplifiers to convert the audio signal into a voltage signal of hundreds of volts. Electrostatic headphones are expensive and not easy to drive. The sound pressure level achieved is not as high as that of dynamic headphones, but the response speed is fast, and various tiny details can be reproduced with extremely low distortion.

2. Dynamic

Dynamic earphones are the most common and common earphones. Its drive unit is basically a small dynamic speaker, and the diaphragm connected to it is driven by the voice coil in the permanent magnetic field to vibrate. Dynamic earphones have relatively high efficiency, and most of them can be driven by the earphone output on the audio system, and are reliable and durable. Generally speaking, the larger the diameter of the drive unit, the better the performance of the headphone. In consumer-grade headphones, the maximum diameter of the drive unit is 70mm, which is generally the flagship earmuff headphone.