the real "spoiler", Feiao FD7 pure beryllium diaphragm moving ring earplug

"pure beryllium diaphragm" is a very rare diaphragm unit in the audio industry. I have only learned about the brands of earphones that have adopted pure beryllium diaphragm before. moreover, earphones equipped with pure beryllium diaphragm are all expensive. if you want to experience the high-quality timbre of pure beryllium diaphragm, you often need to invest a large budget, therefore, the pure beryllium diaphragm is also firmly tied to the word "flagship.

the process of making pure beryllium diaphragm is actually not easy, because beryllium metal itself has strong rigidity, and the thickness of the diaphragm itself is thin, which leads to the fact that pure beryllium diaphragm itself is very brittle and the processing difficulty rises linearly. For example, other titanium diaphragm or aluminum diaphragm can be obtained by pressing through a mold, but the production of pure beryllium diaphragm is not so easy, domestic processing plants are unachievable.

the pure beryllium diaphragm on the market at present actually comes from the same supplier. It is an American enterprise engaged in selling special materials, and its subsidiary has beryllium mineral resources. Yes, if you want to make pure beryllium diaphragm, you must first have the mineral resources of the metal "beryllium. Then another company under this company has the processing technology of pure beryllium diaphragm, so a complete supply chain of pure beryllium diaphragm comes out.

In the early days, you can see traces of pure beryllium diaphragm on some floor speakers. Now, with the maturity of technology, such high-quality diaphragm units can be applied to small earplug products. Dayin's "Yue" and Final's A8000 are both excellent flagship moving ring earplug products, but considering that their starting prices are all in five digits, they are not friendly to users with insufficient budget, at this time, Feiao stood up and its first moving coil earplug FD7 equipped with pure beryllium diaphragm was officially unveiled. Think about it and know that the "spoiler" brand has come.

said it was a "spoiler". Look at the price. The official selling price of Feiao FD7 is only 3999 yuan, which is more than half cheaper than other earplugs with pure beryllium diaphragm. The price of "not playing according to the routine" makes it easy for ordinary users to hear the charm of pure beryllium diaphragm. Some people may ask, "Is the price difference really good?" I can say responsibly: "FD7 is currently the most advanced product in Feiao earplugs. 」

FD7 completely inherits the design of FD5 and is basically made of a set of molds. The biggest difference between the two lies in color matching. The cavity of FD7 is black, while that of FD5 is silver. Although it is only the difference in color, the texture of the blackened earplug cavity is more prominent. The frosted effect of the panel and the mirror effect on the inside look quite extra points, which also makes the FD7 more visually "Flagship Fan" some.

, it is worth mentioning that Feiao has also specially built a stainless steel arc MMCX interface shell for FD7, which makes the material of the interface shell of the wire and the earplug cavity consistent, and is also treated with mirror surface, with a strong sense of integration. In fact, many brands did not attach importance to this small detail before, but Feiao is willing to specially process the wire interface shell for FD7, which is really intentional.

FD7 is a four-strand pure silver wire, which adopts 224-core Litz structure and supports replaceable plug design. Users can still choose three specifications: 2.5mm balance end, 3.5mm single end and 4.4mm balance end. At the same time, the accessories are accompanied by the MMCX quick-release warping tool independently designed by Feiao, which is convenient for users to quickly remove the wire. One more word here, the MMCX interface of FD7 is still quite tight, so tight that there is basically no unstable wire insertion, which is more conducive to wearing, but not conducive to disassembly. It is still necessary to make good use of the official quick-release warping piece, otherwise it is quite difficult to pull it out by hand.

As for the design concept of FD7 cavity, I will not repeat it again. After all, this is the design element of the set of "waterfall and flowing water" on FD5. There are also many fine holes hidden in the embossed lines on the panel, making the whole cavity present a semi-open rear acoustic cavity, thus realizing the purpose of releasing pressure. In fact, in the design of some acoustic structures, FD7 and FD5 have many similarities, not only the semi-open rear acoustic cavity, but also the design of interchangeable acoustic ducts.

FD7 comes standard with three pairs of replaceable acoustic catheters. The inner diameters of the catheters are different. They are divided into three sizes of S, M and L, corresponding to low-frequency catheters, balanced catheters and high-frequency catheters respectively. Users can replace them according to their listening preferences. Personally, I recommend the use of high-frequency catheter, that is, the one with the thickest inner diameter. FD7 under the high-frequency catheter has quite transparent sound performance, and the whole timbre will appear quite advanced and transparent. This is the best sound presentation of FD7.

As for the low-frequency catheter and the balanced catheter, the low-frequency quantity and line thickness of FD7 will be increased. In my opinion, the prominent sound density and information quantity of pure beryllium diaphragm will be more or less restrained. Moreover, even if it is called high-frequency catheter, FD7 will not lose high-quality low-frequency texture due to the replacement of high-frequency catheter. On the contrary, the low-frequency performance of FD7 under, the intensity and sense of atmosphere are still present as they are. It is not easy for such a sound to appear on a moving ring earplug priced at 3999 yuan.

, it should be noted that FD7 is not an easy-to-drive earplug. Its impedance is 50 Ω @ 1kHz and its sensitivity is 112dB @ 1mW. It needs to be matched with a front end with a certain driving capability to give full play to the real strength of pure beryllium diaphragm. Personally, it is strongly recommended to listen to FD7 in a balanced output mode. It takes a certain time for pure beryllium diaphragm to enter.

To be honest, I was not satisfied with FD7 when it first started, because the timbre of FD7 is quite different from the earplugs of pure beryllium diaphragm that I have heard before. The overall sound brightness is insufficient, which is a bit off the middle and lower plate. However, considering the characteristics of pure beryllium diaphragm, I decided to wait for a while to evaluate. As expected, after a period of burn-in time, the sound of FD7 is quite different from that at the beginning. The overall sound details are more abundant. The low frequency, which was originally slightly crowded, is gradually released. The medium and high frequency parts are more linear. This change in timbre surprised me. It can also be seen from the side that FD7 has a lot of sound potential to be tapped. After all, it uses a 12mm pure beryl, larger than the 10mm specification used in earplugs on the market.

, in terms of matching, I have recently inserted FD7 into Feiao's M11 Plus LTD, combining high-frequency catheter and SpinFit earplug sleeve, and listening with a 4.4mm balance port. This set of official matching sound is actually very high-quality. The overall sound is clean and transparent. The low-frequency sense of quantity is moderate. The medium-frequency fineness and high-frequency smoothness are quite prominent. The hard qualities such as the amount of information, the sense of space and the sense of line of the sound are kept online. The depiction of human voice and string is deep in my heart. It maintains sufficient quality and is pleasant enough at the same time., if you are a fan of Feiao, then this combination is sure to satisfy your picky appetite.

, it can be said that FD7 is the model that can widen the tuning gap in Feiao earplug products at present. Compared with Feiao's popular tuning style in the past, FD7 gives me quite a different listening experience with slightly gorgeous timbre, which is also the main reason why I call it the most advanced sound in Feiao earplug at present. Of course, on the other hand, FD7 has really lowered the price of pure beryllium diaphragm. The previous five-digit flagship price can now be owned only in 3999 yuan. This undoubtedly greatly reduces the listening threshold. Whether you choose FD7 or not, I will suggest you go to the offline store to actually listen to its voice. Don't "judge the voice by price" first. Maybe there will be surprises?

author:Xiaomiao-Hai09-06 09:16

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