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On the classification of the Headset measure
Publisher:Time:2015-1-29 13:39:57View:
Tone quality
The measure of Headset can use some methods of speakers, but Headset listening feeling and speakers are different speakers, sound waves in air attenuation, interference occurs, the interaction with human head and ears, Headset sound directly into the ear.
Headset voice quality is more important than its technological properties, because the head and ear shape is different, a pair of Headset have different listening to different people, so it is recommended only as a reference, must have the opportunity to personally listen can really feel the Headset voice.
What is a high fidelity Headset? The main properties of high fidelity Headset recommended by the International Electrotechnical Commission IEC581-10 file are: frequency range of not less than 50Hz-12500Hz, the current response of moving coil Headset optimal frequency is about 5-45000Hz; the typical frequency response allowed error of plus or minus 3dB; frequency response curve slope of no more than 9dB per octave; unit in the same octave bandwidth in the average sound pressure level the difference is less than 2dB within 250Hz-800Hz or so; in the range of 100Hz-5000Hz, the sound pressure level is 94dB, the harmonic distortion is less than 1%, 100dB less than 3%; Headset biggest advantage over the speakers in the details of the actual, listen to a good Headset should be clear sound, rich in detail, no audible distortion; low-frequency deep and clearly, effectively control; the whole band to smooth smooth, high frequency but bright or too dark. For any pair of Headset, tri band can't both be very perfect, smooth and natural connection between them is the most important.
Comfort
Headset comfort is also very important, the use of Headset at the same time as there are other activities are to be taken into account, a pair of Headset not too tight or too loose, should wear a long time. Headband and unit can be adjusted can assure different head shapes and different use, audio professionals sometimes need to monitor single unit, unit needs to rotate, length and unit in addition line into the line mode is one of factors that affect the use of. Should pay attention to in adjusting the headband length: headband is short, the head of a large pressure, earmuffs head pressure on the small, headband long on the contrary, it is most comfortable three point pressure to achieve balance, for the adaptive headband this problem did not exist. Also some circumaural Headset adopts pentagonal design, can be more attached to the human ear, wear more comfortable.
Durability
Durability is very important in portable audio and professional fields, portable audio Headset relatively light and small, easy to be damaged; the professional Headset use and frequent movement, is also easy to step on the broken line and pull off, requirements Headset manufacturing is very strong, and easy to repair and replacement of parts.
Another and durability are related to the bearing power, power is very small you can take Headset push loudly, more than bear power when it is damaged Headset may, general civil Headset bear power is less than 100mW, the professional Headset in 100mW-1000mW. The high impedance Headset voice coil resistance is strong, not as a low impedance Headset voice coil that is sensitive to the change of power, more durable.
Parameters
Headset technical parameters is very important, but also may be misleading, Headset quality parameters of beautiful may not be good, Headset voice parameters of flat is not bad.
Impedance:
Headset impedance is the impedance referred to, which is the size of coil DC resistance and the inductance coil and: Z= (R2+ 2L2) 1/2.
Impedance of civil Headset and professional Headset are generally in the 100 Omega below, some professional Headset impedance under 200 above, this is in order to promote the only Headset in a power amplifier power amplifier load reduction. The driving power impedance high Headset need more. Japanese Headset relative impedance is low, even as this Denon D7100 flagship Headset, impedance is only 25 Euro, very easy to drive.
Sensitivity
Sensitivity is usually said Headset is actually Headset sensitivity level, it is the application of electrical power in Headset 1mW, Headset generated is coupled to the simulation of ear (dummy head) in the sound pressure level, 1mW power is based on frequency of 1000Hz Headset standard impedance on the basis of calculation. The sensitivity of the unit is dB/mW, another commonly used is dB/Vrms, namely 1Vrms voltages generated in the sound pressure level of the Headset. High sensitivity means to achieve sound pressure level certain power required to be small, the sensitivity of the moving coil type Headset generally above 90dB/mW, if it is selected as the best Headset Walkman, sensitivity at about 100dB/mW or higher.
Sound sensitivity is the input sound pressure level 1W power generated in the 1 meters, for the numerical sensitivity similar Headset and speakers, 1/1000 power Headset required is equivalent to the speaker, in fact this value also small, because very few people listen to the speakers at a distance of 1 meters
Distortion
Headset distortion is generally very small, in the maximum power when the total harmonic distortion (THD) less than or equal to 1%, basic is not audible, a speaker distortion more.

 



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