Earphone Headset FAQ
Headphones common problems open and closed headset difference open headphone shell is open, open headphones light quality, natural sound, no pressure. Because it is open, the sound leak, outside the noise will enter. Semi-open headphones mean that the opening of the headset is selective, that is, only for some frequencies open to other frequencies are closed, or in a certain direction is open in the other direction is closed. The enclosure of the closed headset is closed to prevent external sound from entering, the sound leaks are reduced, and many of the professional monitors are used. The sound is generally very clear, rich in detail, low frequency response is very good, for most people closed headphones wearing a sealed only sense. What is a high-fidelity headset? International Electrotechnical Commission IEC581-10 standard The main performance of high-fidelity headphones is: frequency response of not less than 50Hz to 12500Hz; typical frequency response tolerance of ± 3dB; two-channel (such as stereo) two headphones frequency response curve (The center frequency of 250 ~ 8000Hz range) bandwidth of the average sound pressure level difference shall not be greater than 2dB; 100Hz-5000Hz range, the sound pressure level is 94dB (20uPa as the base), harmonic distortion No more than 1%, 100dB when not more than 3%; headphone frequency response between 2KHz-5KHz allowed to decline to improve the transparency and sense of space. What is the frequency response range of the headset? Frequency response (Frequency Response): frequency corresponding to the sensitivity value is the frequency response, drawn into the image is the frequency response curve, human hearing can reach the range of about 20Hz-20000Hz, the current mature headset process have reached this requirement The Frequency response range refers to the headset can send out the width of the band, excellent headphone frequency response width of up to 5Hz-40000Hz, while the human ear hearing range only 20Hz-20000Hz. It is worth noting that the criteria for defining the frequency response width are different, for example, at a standard of less than 1/2 of the average output amplitude or less than 1/4. This is obviously not the same. The average manufacturer is an output amplitude reduction of 1/2 as the standard measured frequency response width, which means that -3dB as the standard, but because of the different test standards used, some products are measured at -10dB. This is actually equal to less than the normal value of 1/16 under standard measurements. So the frequency of the wide width of the wide widening. Users in the purchase, should pay attention to different brands of headphones frequency response width may have no test standards.
What is the impedance of the headset? Impedance: Note that in the world of direct current (DC), the effect of the object on the current obstruction is called resistance, but in the field of alternating current (AC), in addition to the resistance will impede the current, the capacitance and inductance Will also hinder the flow of current, this effect is called the reactance, and we are talking about the resistance of the resistance and reactance in the vector and. In the desktop or amplifier, VCD, DVD TV and other headphone jack output on the machine, the general use of high-impedance headphones more appropriate. If you use low-impedance headphones, be sure to lower the volume and then plug in the headset, and then a little bit of the tune up to prevent the headset overload headphones burned or voice coil deformation caused by broken sound, low impedance headphones are generally easier Push, so portable and other portable, power-saving machines should choose low-impedance headphones, but also pay attention to the sensitivity to high, the sensitivity of the Walkman is more important.
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