一.Classification of headphones
1.According to the principle of transducer
Is Dynamic and Electrostatic headphones two categories
Dynamic headphones Principle: The overwhelming majority (about 99% above) are considered such earbud headphones, similar to the general principle speaker, in a magnetic field in the coil Wing and diaphragm attached to signal current in the coil driven driven diaphragm Voice
Electrostatic headphones: diaphragm in a changing electric field in the diaphragm extremely thin, precise to a few micron (currently STAX new generation of electrostatic headphones diaphragm has been accurate to 1.35-micron), coil in the electric power-driven, driven by Film audible.
2.According to the degree of opening hours
Is Open, Semi-open, Closed
Open: listen to the general sense of the natural, they should wear comfortable, common in home appreciation HIFI headphones, sound could be leaked, but the same can also hear the voice of the outside world, headphones on ears of oppression smaller
Semi-open: There is no strict rules, can only voice can not see into not only the progress made in accordance with the needs of the corresponding adjustment
Closed: earmuffs on the ear to prevent the oppression greater access to voice, clear voice of the right location, professionals in the field of such eavesdropping, but the shortcomings of such a headset is the bass sound with serious, W100 is an obvious example.
According to the Use
Is Home, Portable, Monitor, Mix, Binaural Recording

二:Headset parameters
Impedance: meaning of resistance and attention to the difference between the DC (DC) of the world, the objects on the current role in obstructing the resistance is called, but the alternating current (AC) in the area apart from the resistance will hinder current, capacitors and inductors will hinder The current flow, such as on the role of reactor, and our daily said the resistance is resistance and reactance in the vector and.
Sensitivity: Enter at 1 mW earphone power when the headset to a sound pressure level (sound pressure decibel is the unit, the greater the volume of sound pressure greater), so the higher the sensitivity of the general, the smaller the resistance, the easier it is to headphones Sound, the easier it is to drive.
Frequency Response: frequency of the sensitivity of the corresponding value is the frequency response, image is drawn into a frequency response curve, the human hearing range can reach about 20 Hz-20000Hz, the current maturity of the headphones have reached such a request.

三:Sound evaluation of terms
Range: musical instruments or voice and sound to achieve the highest among the scope of Zuidi Yin Sound: also known as Yin Pin, the voice of one of the basic attributes
With the sound: music and the antithesis of neutral, that is infected with the voices of some programs do not have characteristics of the sound signal into the replay showed that in the more (or less) of certain elements, this is obviously a distortion.
Distortion: the output of equipment is not fully resume its import, produced a wave of distortion, or signal components of change.
Dynamic: Allow record of the largest information and the ratio of minimum information Transient response: equipment for music in the sudden ability to follow the signal. Good transient response equipment should be a signal to immediately respond to a stop signal to a sudden halt, and never Tuonidaishui. (Typical musical instruments: piano)
SNR: signal a useful element of strength compared with the noise, often expressed by a few decibels. Equipment that it have a higher signal to noise ratio of the less noise.
Air flu: that for the open treble, or acoustic instruments in the space interval between the acoustic terms.
Low-frequency extension: audio equipment that can replay the lowest frequency. Determination of the replay at the bass speaker sound system can dive or to what extent the scale.
Bright: that prominent 4 kHz-8kHz high-frequency band, at this time a relatively strong in the fundamental harmonic

四:On the headphone wire
Most headphone lines with copper as raw materials, the average purity (generally a few N said, such as 4 N, 6N……) the higher the conductivity of the better signal distortion is,
the common are:
TPC (electrolytic copper): purity of 99.5%
OFC (oxygen-free copper): purity of 99.995%
LC-OFC (oxygen-free copper or linear crystal crystal oxygen-free copper): purity of 99.995 percent above
OCC (Crystal Copper): purity of the highest in more than 99.996 percent, is divided into PC-OCC and the UP-OCC

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