Many brands will change the new color based on the products they have already launched to meet the marketization of individuality, and Meizu will launch the Meizu EP51 White Edition again in the form of improving the technology in the conference. Meizu's ingenuity in returning audio is still visible.
Compared to the black wire and body, the white version has a yellowing resistance rating of 4.5, which is close to the yellowing resistance of 5 grades that are not yellow. But for many consumers, the yellow-proof process improvement can really feel for a moment and a half, what makes the headphones body and plastic yellow? During this aging process, we experienced a lot of problems with many domestic headsets. Through the white version of the process, we came to understand the dangers of yellowing and other aging problems.
Appearance packaging:
The white version of the packaging is different from the black version in terms of printing. Both merchants and consumers can easily distinguish, and simple replacement on the envelope can meet the market differentiation and the convenience of mass production identification is also the practice of all mainstream manufacturers.
The back of the package describes the five major features of the product: Bluetooth 4.0 transmission, strong magnetic anti-slip design, ergonomic earmuffs, 6 hours of call, line control functions compatible with mainstream system platform. The basic parameters are: CSR8645 chip scheme, 8.6mm speaker unit, 16Ω impedance design, maximum power 10mw, earphone sensitivity 88±3db, and battery life of 6 hours.
Three pairs of large and medium-sized silicone sleeves and storage bags are included in the package. In order to coordinate with the headphones, the snow-white color is similar to that of the body.
The white version of the storage bag is changed to a blue-and-white shape, which is a very recursive color for users familiar with the MEIZU style. The work and opening and closing of the storage bag zipper is very stable and smooth. The storage bag contains a short Micro USB cable. The use of charging is quite convenient, and the actual test can also allow larger currents to be used for the fast charging of mobile phones.
The white version has achieved a fairly coordinated color transition design. The silver-gray wire with a white body is harmoniously transitioned to a silver metallic texture. This contrasts with the design color scheme of the black version to please many girls and users who like the small and fresh. .
Considering the color matching of the whole machine, the white version has redesigned the white in-ear cover, which also has a considerable improvement in flexibility and water resistance, and the actual wear of the ear canal is more comfortable.
By comparing with the color version of the black version, it can be found that the black and red black and black silicone sleeves are significantly inferior to the white version in dust resistance.
In the figure below, we can see the black version of the wire control surface, the TPU polyether type white wire in the anti-fouling performance and resistance to the process is worse than the improvement process, obviously can see the white version of the wire control in the author after two weeks of sweat And the sunshine baptism remains strong.
However, the earliest headache for white headphones is the aging of the product and the appearance of yellowing. So what is the anti-yellow grade yellowing in China?
What is the definition of yellowing?
Yellowing refers to the phenomenon that the article is exposed to natural light, ultraviolet rays, heat, oxygen, stress, chemical etching, moisture, etc., and unfair production processes, etc. The phenomenon of yellowing is the basic definition of yellowing.
The right side of the picture shows the yellowing of the wire and the difference in the wire from which the yellowing began.
The reasons for the yellowing problem:
1. The influence of the polymer structure itself, there is a bond energy between the macromolecule chain bonds of the polymer. When the energy provided is greater than the bond energy, the molecular chains are likely to produce active concentration, which will cause the polymer to be used during storage and use. Gradual degradation leads to yellowing.
2, the impact of light, when the applied material absorbs light energy, the molecular chain on the absorption site will produce carbon-carbon bonds or the cleavage of carbon-hydrogen bonds. Yellowing occurs.
3, the influence of heat, oxygen molecules, application of materials over time will occur oxidation reaction, heat will accelerate the oxidation process of the material. After the formation of the peroxide structure, free radicals are easily formed, resulting in discoloration of transparent, light-colored, white materials. Oxygen has the most significant destructive effect on unsaturated diene materials. In addition to activating oxidation, the effect of heat can also lead to cracking of the C—C—bonds and cracking of the double bonds, resulting in yellowing of the material.
4. The influence of other factors, yellowing is also related to the additives added in the applied materials, the presence of moisture, impurities, and the processing production process. Raw materials mixed with various chemical or mechanical impurities will reduce the stability of the polymer. The reasons are more complex and require targeted analysis and troubleshooting.
Headphone material yellowing resistance principle:
Many mainstream headphones on the market mainly use metal-based aluminum-magnesium alloy stainless steel, and ABS/PC plastics. In terms of wire materials, PE TPE PVC PU is mainly used. For example, ABS shell or TPU wire materials are used as white materials. Can avoid the daily use of UV damage caused by the use of factors in all aspects of aging, usually ABS material production when adding anti-yellowing agent Fisorb B5435, prevent ABS yellow problem, or spray some UV oil to improve.
The picture shows the EP51 with anti-yellow 4.5 rating. The bottom left is the beginning to change the yellow earphone, and the right side is the earphone that has yellowed.
The EP51 remote control consists of a polyether type, which is also improved by the addition of a yellowing agent. In addition, the polyester TPU pass has certain advantages such as antibacterial property, high strength, hydrolysis resistance, and high rebound and low temperature performance.
In the yellowing resistance, the highest grade is 5, which is not yellow, and 4.5 is a grade that is nearly unyielding. It is difficult to reach 4.5 grades in mainstream mainstream domestic materials, and the mainstream materials are generally about 3 in the yellow design grade. In our aging test environment, continuous tests are performed by simulating sunlight luminosity or UV light.
Sound quality evaluation:
Although I have published a black version of the evaluation has been fully described EP51 sound quality evaluation. Taking into account whether there may actually be a deviation in the version or sound adjustment, I actually tested it again for two weeks. The actual sound quality is still not different from the black version.
Compared with the mainstream Bluetooth headset design, EP51 sound has a very rare health design, there is no Bluetooth low frequency in the ultra-low power design caused by the low thrust of the weak, the entire sound texture of the soft scattered virtual electroacoustic design of the drawbacks . In the low-frequency design with good elasticity, it provides good texture and flexibility. Although the low frequency is lacking some impact and metal feeling, it is not a big problem to deal with the mainstream of Europe and the United States.
The EP51 IF is quite suitable for the feminine style of the feminine, and at the same time, the fullness and level resolution of the vocals has exceeded the Bluetooth in-ear products of the thousand yuan price. While gradually opening, the most amazing thing is the high-frequency sweetness and exquisite analytical expression. The texture of the instrument is quite bright and pleasing to the ear without harshness. The texture and elasticity of the high frequency are quite smooth and comfortable.
Product summary:
EP51 white version of the improved process also meets the people's pursuit of color value and color, but the author is surprised to see a lot of websites some users are inevitably in the discussion of the EP51's doubts, but even the author The old slag with Huang Zhang is not good, nor can we deny that the headphone team's tuning on this product really exceeds many international mainstream thousand-dollar products.
The sense of hearing surpasses the existence of Meizu MP3 product design (beyond M3 and M6's sense of hearing and more resistant to hearing). The Meizu Group Fengda Acoustics team has also designed and driven many old-line front-line supply chains to support it at the same time. The success of the EP51 I think is that Meizu is finally looking for a team to do audio to do this thing, and now Meizu's audio peripherals even more technical capabilities and execution than the player era.
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