1. The headset parameters [_] the Frequency response (Frequency Respse) : Frequency sensitivity of the corresponding numerical is Frequency response, draw up the image is Frequency response curve, human hearing can be about 20 Hz in the range of 20000 Hz, at present the mature headset technology has reached such a request.

Frequency response range is refers to the headset to the launch of the width of the band, good headphones frequency response width of 5 Hz-40000 Hz, and of the auditory range in just 20 Hz-20000 Hz. Note the frequency response of the width of the standard definition is different, for example by less than average output amplitude of the standard or less than 1/4 to 1/2 for is a standard, this is clearly not the same. The general manufacturer is a range of output is a standard measure 1/2 frequency response width, this means that the 3 dB to is a standard, but from the test standards are different, there are some product is-10 dB for measurement. In fact is equal to 1/16 below normal for the standard measurement. So the frequency response of the width of the big idea of o. Users when the choose and buy, should be aware of the different brand of headset frequency response width may have not testing standards.

2. The headset technical parameters [_] headset Impedance (Impedance) : pay attention to the meaning of the resistance distinction, in a direct current (DC) in the world, the function of objects in the current obstacles called resistance, but in an alternating current (AC) in the field is in addition to the resistance would block the current beyond, capacitance and inductance will prevent the flow of the current, this effect is called the circuit reactance, and our daily said Impedance is resistance and in the circuit reactance vector and.

In desktop or power amplifier, VCD, DVD and television have headphone jacks output of machine, use commonly be suitable for high impedance headphones. If use the low resistance headphones, we must first turn down the volume on the headset again, again a little bit turn down the volume up and stop headset overload will headset or burn out voice coil dislocation deformation caused by the sound, low impedance headset is compared commonly easy to push, so such as portable walkman, save electricity machine should choose low impedance headphones, but also pay attention to the high sensitivity, the walkman is more important sensitivity index.

3. Headset parameters [_] headset harmonic distortion: the output of the equipment can't completely reiteration the input, and produced the waveform distortion or signal components of the increase and decrease.

Harmonic distortion is a waveform distortion, the index of have a mark with headphones, the smaller the distortion, and the sound quality is the better.

4. Headphone technology parameters [_] headset Sensitivity (Sensitivity) : point to the power input 1 mw headphones when a headset can sound pressure level (the sound pressure units are decibels, the greater the pressure volume), so the higher general Sensitivity, the smaller the impedance, the headset the easier to sound, the more likely to drive.

Popular speak, headphones sensitivity refers to the same here, need to enter the size of the power, the higher the sensitivity to the smaller the input power. For walkman, etc for portable devices, sensitivity is a very noticeable index. Of course, for desktops for, the index is relatively is not so important.