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1. How to choose headphones

As a terminal playback equipment headphones by more and more consumers attention and favor, now there are many headphone brands on the market, product lines are also very complete, from about 10 yuan of simple headphones, to 100 yuan, hundreds of yuan of high-end headphones, to thousands of yuan of electrostatic monitoring earphones. When you want to choose a pair of products that are not expensive, the quality is good, and the brand awareness is no stranger, do you feel confused and do not know how to start?

Don't put the headphones wrong?

(1) Headphones affect listening quality

With the popularity of online music download, digital portable music gradually prevailed, while bringing convenient music enjoyment, music quality issues have also received more and more attention, taking MP3 as an example, due to the technical characteristics of MP3, in the emphasis on convenience, large storage, power saving function while losing audio power and sound original sound quality, to solve this problem must be completed through the final music playback component - headphones. It can improve the sense of musical space, layering and enhance the performance of high, medium and low frequencies of digital listening products. Only a good headset can fully reflect the sound quality of digital products.

Tips: The easiest way to identify unqualified headphones, after wearing the headphones for 10-15 minutes, if the ears have pain and accompanied by slight dizziness and nausea, it means that the earphones have quality problems, and it is recommended to replace the better headphones.

(2) Headphones affect hearing health

Inferior headphones are a killer of hearing health, and its overly sharp treble can easily cause hearing fatigue in a short period of time, resulting in hearing loss. And too thick, lack of detail bass like chronic poison can easily make the ears sore, tense and sensitive, the head full, resulting in a slow decrease in hearing level. Beautiful music makes people feel good, and the importance of a good mood and mentality for human health has been recognized by the medical community.

(3) Headphones are becoming a new highlight of fashionable digital life

With the advent of the digital era, consuming digital happiness and enjoying digital entertainment have become people's leisure and stress relief pleasures, and the simple sound transmission function of headphones can no longer meet people's pursuit of diversified sensory stimulation. There is no reason for a high-end, exquisite digital product to be paired with a casual headset, exquisite, fashionable, personalized matching, has become a new trend of choice for people of taste.

Choosing a headset "five-step method"

Step 1: Choose headphones with different expressiveness according to the type of music

If you like to listen to electroacoustic and rock music, you should focus on choosing headphones with strong bass; Those who like light music should choose headphones with delicate high and high frequencies, and the overall hearing is biased towards soft and delicate. Complementary matching methods can be used with digital portable products, simply put: devices with cooler sounds can be equipped with headphones with warm timbre, and devices with warm sounds can be equipped with headphones with clear timbre to achieve complementary and coordinated listening effects.

The second step is to judge from the appearance

The earphone shell feels smooth and has a certain degree of resistance to pressure and toughness. The thread is soft to the touch, elastic without hardening. The plug pacing layer is smooth and even, there will be no burrs, and the overall feeling is finely worked.

The third step is to judge from the wearing comfort

High-quality headphones should be designed to be ergonomic and comfortable to wear. The simple method, after 10-15 minutes of the trial, there should be no pressure, swelling and dizziness.

Step 4: Select a good sound source for audition

It is important to select a good audition source, it provides the necessary guarantee for audition, and the sound characteristics of good headphones:
● The sound is clear, without any unpleasant noise;
● No distortion or very little distortion at high volume;
● Good sense of balance, the sound will not be too bright or too dark, the transition between high, medium and low frequencies is smooth and smooth;
●The high frequency is delicate and supple, the medium frequency distortion is extremely small, the human voice is affectionate, and the low frequency is deep and clear;
●Good resolution, rich details, and clear replay of tiny signals.

The fifth step is to judge from the performance indicators

The frequency range of headphones is generally to reach 18-22000HZ, not less than 20MW of power, less than or slightly equal to 0.5% harmonic distortion, etc., some small factories produce quality is not up to the second, performance indicators or random additions, or exaggerated. If the performance indicators on the manual do not meet the above requirements or the product is written too high, it is best not to buy.

2. Technical parameters of headphones

(1) Headphone parameters [_] Frequency response of headphones (Frequency Respse): The sensitivity value corresponding to the frequency is the frequency response, drawn into a picture is the frequency response curve, the range that human hearing can achieve is about 20Hz-20000Hz, and the current mature headphone technology has met this requirement. The frequency response range refers to the width of the frequency band that the earphone can broadcast, and the frequency response width of excellent headphones can reach 5Hz-40000Hz, while the hearing range of the human ear is only 20Hz-20000Hz. It is worth noting that the criteria for defining the width of the frequency response are different, for example, the standard is less than 1/2 of the average output amplitude or less than 1/4 of the standard, which is obviously not the same. Generally, manufacturers measure the frequency response width by reducing the output amplitude by 1/2 as the standard, which means that -3dB is the standard, but due to the different test standards used, some products are measured at -10dB. It is actually equal to 1/16 of the normal value for standard measurement. Therefore, the width of the frequency response is greatly broadened. When purchasing, users should pay attention to the frequency response width of different brands of headphones may have different test standards.

(2) Headphone technical parameters [_] Headphone impedance (Impedance): Pay attention to the difference between the meaning of resistance and resistance, in the world of direct current (DC), the role of objects on current obstruction is called resistance, but in the field of alternating current (AC), in addition to resistance will hinder the current, capacitance and inductance will also hinder the flow of current, this role is called reactance, and what we call impedance daily is the sum of resistance and reactance on the vector.

In desktop computers or machines with headphone jack output, such as power amplifiers, VCDs, DVD TVs, etc., it is generally more suitable to use medium and high impedance headphones. If you use low-impedance headphones, you must first turn down the volume and then plug in the headphones, and then turn up the volume a little bit, to prevent the headphones from overloading the headphones or the voice coil deformation and misalignment to cause broken sound, low-impedance headphones are generally easier to push, so portable and power-saving machines such as walkman should choose low-impedance headphones, and at the same time pay attention to high sensitivity, sensitivity indicators are more important for walkmans.

(3) Headphone parameters [_] Harmonic distortion of headphones: The output of the device cannot fully reproduce its input, resulting in waveform distortion or signal component increase or decrease. Harmonic distortion is a kind of waveform distortion, which is indicated in the headphone indicators, the smaller the distortion, the better the sound quality.

(4) Headphone technical parameters [_] Headphone sensitivity (Sensitivity): The sound pressure level that the headphones can emit when pointing to 1 milliwatt of power (the unit of sound pressure is decibels, the larger the sound pressure, the louder the volume), so the higher the general sensitivity and smaller the impedance, the easier the headphones are to make sound and the easier to drive.

In layman's terms, the sensitivity of the headset refers to the size of the power that needs to be input in the same situation here, and the higher the sensitivity, the smaller the input power required. For portable devices such as the Walkman, sensitivity is a very important indicator. Of course, for desktops, this metric is relatively less important.

(5) Transient response: the ability of the equipment to follow sudden signals in music. The equipment with a good transient response should be an immediate response to the signal as soon as it comes, and a sudden stop when the signal stops, and never drags mud and water. (Typical instrument: piano).

(6) Signal-to-noise ratio: also known as signal-to-noise ratio, the contrast between the useful components of the signal and the strength of the noise, often expressed in decibels. A higher signal-to-noise ratio of a device indicates that it produces less noise.