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The Technical Parameters Of The Earphone Is Very Important
Jun 14, 2017

  The technical parameters of the Earphone is very important, but it may be misleading, the parameters of the beautiful headphones sound quality may not be good, the parameters of flat headphones sound may not be bad.

  impedance:

  The impedance of the Earphone is the abbreviation of its AC impedance. Its size is the sum of the coil DC resistance and the inductance of the coil: Z = (R2 + ω2L2) 1/2.

  Civilian headphones and professional headphone impedance are generally below 100Ω, some professional headphone impedance above 200Ω, which is to reduce the power amplifier in a single amplifier to reduce the load. Drive the high impedance of the Earphone requires more power. Japanese headphones relative impedance is low, even if the flagship head like the Dragon D7100, the impedance is only 25 Europe, very easy to drive.

  Sensitivity:

  Generally speaking, the sensitivity of the Earphone is actually the sensitivity level of the Earphone, which is applied to the Earphone 1mW of electric power, the Earphone produced by the simulation of the ear (dummy head) in the sound pressure level, 1mW power is the frequency 1000Hz when the standard impedance of the Earphone based on the calculation. The unit of sensitivity is dB / mW, and the other is not commonly used dB / Vrms, that is, 1Vrms voltage applied to the Earphone when the sound pressure level. High sensitivity means to achieve a certain sound pressure level required power is small, and now the dynamic headphones are generally more than 90dB / mW sensitivity, if it is for the Walkman election headphones, the sensitivity of the best in 100dB / mW or better The

  Speaker sensitivity is input 1W power at 1 meter sound pressure level, for the sensitivity of similar headphones and speakers, headphones required power equivalent to 1/1000 of the speaker, in fact, this value is small, because very little Someone is listening on a distance of 1 meter

  distortion:

  Earphone distortion is generally small, the maximum power in the total harmonic distortion (THD) is less than or equal to 1%, the basic is not heard, less than the speaker distortion.