A headset performance parameters are: impedance, sensitivity, frequency response and distortion. Through the front of the four parameters, we can determine from a perspective of a good or bad to a headset.

Impedance

Headphones are the impedance of the AC impedance for short, the size of its DC impedance of the coil are at more than 200Ω, this is professional in order to have the headphone jack to match up. Desktop or in the amplifier, VCD, DVD and TV output there is the headphone jack on the machine, usually used in high-impedance headphones is more appropriate. If the use of low resistance headphones, the volume must be lowered again to plug in headphones, and then adjust the volume of put a little bit up, to prevent overload headphones headphones or burned voice coil dislocation caused by breaking the sound distortion, impedance of the headset is easier to promote the general , the Walkman and other portable, power-saving machines to choose low-impedance headphones, but also pay attention to the sensitivity to high sensitivity of the target player is more important.

Sensitivity

Sensitivity, also known as sound pressure level. Popular speakers, headphones are reflected in the sensitivity at the same loudness, the required size of input power. Headphones higher sensitivity of the input power required by the smaller, sources at the same power output greater voice. The Walkman and other portable devices, the sensitivity is a target worthy of attention. In general, the sensitivity of Walkman headphones headset high-class than the monitor, at about 110db, and therefore the value of players is of course for the better.

Frequency response

Frequency response refers to a constant voltage output of the audio signal when connected with the system, speaker sound pressure generated by the change in frequency with increasing happen or attenuation, phase changes with the frequency of the phenomenon, the sound pressure and phase associated with the frequency of changes in the relationship between the frequency response is called. Also refers to the extent permitted by the amplitude of the sound system be able to playback frequency range, and in this context of change signal is called frequency response, also known as frequency characteristics. At the rated frequency range, output voltage range of the ratio of maximum and minimum value to a few decibels (dB) to express its unevenness.

Distortion

Distortion into harmonic distortion, intermodulation distortion and transient distortion. Harmonic distortion is the addition of voice playback of the original signal is not high-order harmonic distortion components caused by; intermodulation distortion is mainly affected by aspects of the voice tone; transient distortion of loudspeakers with are because of the inertial mass must exist, basin body can not keep up with the vibration signal changes in an instant shock and cause playback of the original signal and the difference between the sound. With the speaker in the speaker system is more important, sound quality directly affects the degree of reduction, and so the target is closely related to the quality of speakers.

The often expressed as a percentage, the smaller the value that the smaller the distortion.

The four parameters above, we can understand that from one side of the middle class a headset.