1. Ear sensitivity:

With the same loudness, the higher the sensitivity of the earphones, the less power the sound source needs to input. The easier the earphones are to drive.

2. Frequency and sound range:

It refers to the width of the frequency band that the earphone can be released. In the IEC581-10 standard of the International Electrotechnical Commission, the frequency range of high-fidelity earphones should not be less than 50Hz to 12500Hz, the frequency width of excellent earphones can reach about 5Hz-40000Hz, and the hearing range of the human ear is only about 20Hz-20000Hz. Users should pay attention to the frequency sound width of different brands of earphones may have different test standards when purchasing.

3. earphones impedance:

Headphone AC impedance abbreviation, different impedance earphones are mainly used in different occasions, on the desktop computer. Commonly used is high impedance earphones, some professional earphones impedance will even be above 200 ohms, this is to match the professional machine on the earphones socket. For a variety of portable electronics, low-impedance earphones are usually used, which are easier to drive.

4. Harmonic distortion:

A waveform distortion, as indicated in the earphones index, the smaller the distortion, the better the sound quality.