First, how is the classification of headphones
The transducer principle (Transducer) is the main dynamic (Dynamic) and electrostatic (Electrostatic) headset two categories, although in addition to this there are two types of magnetic type, such as several species, but either be eliminated or used In the professional use of the market share of the very few not to discuss this.
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 Audible.
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.
Second, the degree of opening hours
Is open, semi-open, closed (Closed)
Open headphones listening to the general sense of nature, 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 adjusted accordingly.
Closed: earmuffs on the ear to prevent the oppression greater access to voice, clear voice of the right location, professionals in the field of多见such eavesdropping, but the shortcomings of such a headset is the bass sound with serious, W100 is an obvious example.
Third, some of the relevant parameters and headphones sound terms on behalf of what is the point
1. Headset parameters
Impedance (Impedance): note the distinction between meaning and resistance, 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 impede the flow of current, such as on the role of reactor, and our daily said the resistance is resistance and reactance in the vector and. In general, low-impedance headphones better push, but the first to use a certain volume reduction to plug in headphones, and then a little tune to boost the volume, this can be contained to prevent a headset or earphone burn voice coil deformation dislocation Causing distortion, such as portable music players, power-efficient machines should choose low-impedance headphones, but also pay attention to the high sensitivity, sensitivity to the players, the more important indicators.
Sensitivity (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 impedance headphones The easier it is to Chusheng, the easier it is to drive.
Frequency response (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 this Requirements.
2. Terminology quality evaluation
Range: the human voice or instrument to achieve the highest audio and Zuidi Yin between the scope.
Sound: also known as Yin Pin, the voice of one of the basic attributes, such as the erhu, pipa is a different tone.
With the sound: music and the antithesis of neutral, that is infected with the voices of some programs do not have features such as a jar in front of his speech be the kind of voice that is typical with the sound. Music playback with a signal 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: - also known as noise ratio, 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. At this time, high-frequency response can be extended to 15 kHz-20kHz. Antonyms "gloomy (dull)" and "thick (thick)".
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. For example, small Subwoofer the low-frequency can be extended to 40 Hz, while large Subwoofer is down to 16 Hz.
Bright: that prominent 4 kHz-8kHz high-frequency band, at this time a relatively strong in the fundamental harmonic. What problems does not in itself a bright, live music concerts there are bright voice, the problem is bright in the master sense of proportion, too bright (even Xiaojiao) is unwanted.
Fourth, 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
