How to buy a headset
Headset comparison - buy - experience articles: headset to know the relevant knowledge to know to explain.
How to buy a headset
Headphones are small, but the requirements of the production process is quite high, the purchase also has a lot of knowledge. First of all, from the indicators on the analysis, the common headset technical indicators are: headphone structure, sensitivity, frequency response range, impedance, harmonic distortion, wire, energy conversion methods.
Divided into closed, open, semi-open. Closed is through its own soft sound pad to wrap your ears, so that it is completely covered up. Such headphones because of a large sound pad, so the head is also larger, but with the sound pad can be used in a noisy environment without impact; open headset is more popular headset style. This type of machine is characterized by the use of sponge-like microporous foam plastic production sound ear pads. It is small, comfortable to wear, is no longer the use of heavy dye pad, and there is no isolation with the outside world, but its low frequency loss. In the listening, this headset is still good; semi-open headset is a combination of closed and open two headphones advantages of the new headphones (it is a half-breed, the integration of the advantages of the first two headphones, improved shortcomings ), Such headphones using a multi-diaphragm structure, in addition to an active active diaphragm, there are a number of passive driven diaphragm. It not only has a low frequency description of the fullness of the rich, but also has a high-frequency description of the bright natural, clear and so many features. Today, many of the higher grades of headphones is widely used in this headset.
Refers to the same loudness in the case, the sound source needs the size of the input power, that is, the user sounds like the same sound, the higher the sensitivity of the headset, the sound source needs to enter the smaller power. This is for portable devices such as Walkman, the higher the sensitivity, the more easy to drive headphones.
Frequency response range:
Refers to the headset can send out the width of the band, the International Electrotechnical Commission IEC581-10 standard high-fidelity headphones frequency response range can not be less than 50Hz to 12500Hz between the outstanding headphones frequency response width of up to 5Hz-40000Hz or so The hearing beats by dre studio range is only about 20Hz-20000Hz. It is worth noting that the criteria for limiting 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 different. The general manufacturer is the output amplitude reduction of 1/2 as the standard measured frequency response width, that is to -3dB as the standard, but because of the different test standards used, so some products that are measured at -10dB The. But in fact is equivalent to less than the normal value of less than 1/16 as the standard cheap beats measurement, so the frequency width greatly widened. Users should pay attention to the purchase of different brands of headphones frequency response width may have different test standards.
Is the earphone AC impedance of the short, different impedance of the headset is mainly used for different occasions, in the desktop or amplifier, VCD, DVD, TV and other equipment. Commonly used in high-impedance headphones, some professional headphone impedance even in more than 200 ohms, which is in order to match the professional machine headphone jack. For a variety of portable Walkman, such as CD, MD or MP3, the general use of low-impedance headphones, generally because these low-impedance headphones easier to drive.
Is a waveform distortion, marked in the headset indicators, the smaller the distortion, the better the sound quality. Such as: less than 1%
Divided into: electric, capacitive and dual-split headphones. Moving coil is the most common, with a simple structure, sound quality and stability, to withstand power, high sensitivity; capacitive also known as static headphones, with good sound quality, frequency bandwidth advantages. But the structure is very complex, resulting in manufacturing difficult, making very few manufacturers to do such headphones. Now the market is also rarely seen using this model of stereo headphones; dual-split headphones in the semi-open headset on the basis of the cheap beats by dr dre integration of the electric and capacitive both the advantages of their own dual-band headphones. It combines the advantages of electric, capacitive, closed, open four headphones, such as from the dynamic range, transient response, playback quality, sound thickness, etc. are very outstanding, and Its sound resolution is the best choice for music enthusiasts.
1, pass the way
When you buy headphones, headphones or instructions on the performance indicators to pay attention to, because the poor quality of the headset is often a small number of small factories, and its performance indicators are casually marked, some exaggerated. Headphones generally have to reach the minimum 20 ~ 20kHz frequency range, greater than 100mW power, less than or slightly equal to 0.5% of the harmonic distortion. If you do not meet the above requirements, you'd better not buy. If the performance on the instructions to write too high the best products do not buy.
2, the quality of product work
Large manufacturers of the more authentic use of headphones is usually used in engineering plastics, so the appearance is very smooth, but also a certain degree of stress and toughness; it is not stiff, workmanship is also more fine, feel good, but not the use of poor quality plastic rough sense. Also, the headset wire diameter is relatively thick, you can ensure stable transmission, the line feel soft and hard; plug done very neat, will not leave the burr, the coating smooth and even. If you do not meet the above conditions do not buy the best
3, your not necessarily for you
Many users think that as long as you buy a point of your headphones will be able to get better sound quality, it is not true, there are some high impedance of the headset, high impedance headphones can control the sound better, but this requires more output Power support, while the MP3 player itself, the output power is limited, can not drive a good high-impedance headphones. Currently in the market of MP3 playback, the more common is about 5mW +5 mW output power, in this output power is best to use 50 ohm below the impedance of the headset. So, it is best to look at the upgrade before the headset and MP3 player technical parameters, or else to buy back after the discovery does not match there will be a lot of trouble Luo.
Some of the relevant parameters and sound quality terminology headphones on behalf of what the meaning
1. Headset related parameters
Impedance: 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 reactance, and we said the impedance is the resistance and reactance in the vector and. Generally speaking, low-impedance headphones is better to push, but in the use of the volume must first be reduced and then plug in the headphones, and then a little bit of the tune up, so you can prevent headphones overload the headset burnout or voice coil deformation misplaced Resulting in broken sound, 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.
Sensitivity (sensitivity): point to the headset input 1 mW power when the headset can send the sound pressure level (sound pressure unit is decibel, the greater the sound pressure the greater the volume), so the higher the general sensitivity, the smaller the impedance, headphones The easier it is to speak, the easier it is to drive.
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 has reached this Claim.
2. Sound quality evaluation terms
Range: The instrument or vocals can reach the range between the highest and the lowest.
Sound: also known as sound, sound one of the basic attributes, such as erhu, pipa is a different tone.
The natural opposite of music, the sound of the sound of the program itself does not have some of the characteristics, such as facing a jar speech to get the kind of voice is a typical sound dye. The dyed indicates that the reproduced signal is out of (or reduced) some of the components, which is obviously a distortion.
Distortion: The output of the device can not completely reproduce its input, resulting in waveform distortion or signal component increase or decrease.
Dynamic: Allows you to record the ratio of the maximum and minimum information.
Transient response: the ability of the device to follow the sudden signal in the music. Transient response to a good device should be a signal to immediately respond, the signal stopped at a sudden stop, never dragging its feet. (Typical instruments: piano)
Signal to noise ratio: also known as the signal to noise ratio, the useful components of the signal and the strength of the noise contrast, often expressed in decibels. The higher the signal-to-noise ratio of the device, the less noise it produces.
A sense of acoustics that is used to indicate the openness of a treble or in a sound field that is spatially spaced between musical instruments. At this point, the high frequency response can be extended to 15kHz-20kHz. There are "dull" and "thick".
Low frequency extension: refers to the audio equipment can reproduce the minimum frequency. Is used to determine the extent to which the sound system or speaker can be dived to the extent that the bass is reproduced. For example, the low-frequency subwoofer low-frequency extension can be 40Hz, while the large subwoofer is dive to 16Hz.
Bright: refers to the 4kHz-8kHz high-frequency band, when the harmonic is relatively stronger than the fundamental. Brightness is not a problem, the live concert has a bright voice, the problem is bright to master the sense of proportion, too bright (even whistle) will be annoying.
About headset wire
Most of the headphones are copper as raw material, the general purity (generally used a few N said, such as 4N, beats solo 6N ...) the higher the better conductivity, the signal distortion is smaller, common are:
TPC (electrolytic copper): purity of 99.5%
OFC (oxygen-free copper): purity 99.995%
LC-OFC (linear crystal oxygen-free copper or crystalline oxygen-free copper): purity above 99.995%
OCC (single crystal oxygen-free copper): the highest purity, more than 99.996%, divided into PC-OCC and UP-OCC