Knowledge of various performances of popular science earphone speakers
Impedance: The impedance of the earphone is the abbreviation of its AC impedance. Impedance refers to the resistance to alternating current in a circuit with resistance, inductance and capacitance. The unit is ohm (Ω). Generally speaking, the lower the impedance, the easier the earphones are to sound and drive. The size of the headphone impedance is also closely related to the sound quality of the headphone. The impedance changes with the frequency. The impedance of the headphone is larger at low frequencies and smaller at high frequencies, so for most headphones, increasing the impedance will make the sound become more feeble.
Sensitivity: The sensitivity of the earphone refers to the sound pressure level that the earphone can emit when the power of 1 mW is input to the earphone (the unit of sound pressure is decibel, the higher the sound pressure, the higher the volume), so the higher the sensitivity, the lower the impedance. , the easier the earphones are to sound and drive. Generally, headphones are used for daily use, and the sensitivity is preferably around 100dB/mW or higher.
Frequency response range: frequency response range, also known as frequency characteristics, the human audible range is 20Hz-20KHz, the lower the frequency response, the better the bass, and the higher the frequency response, the higher the treble. Of course, it also depends on the error range. The smaller the error range, the clearer the sound of each frequency can be.
Unit size: Generally speaking, the size and diameter of the unit are linked to the sound quality. To a certain extent, the larger the unit, the wider the frequency response of the earphones, but this is not absolute. This also involves the power of the headset, frequency response, sensitivity, impedance matching, sound source quality, and so on.
