[Vagal Reflection. Evaluation Machine] Pure beryllium diaphragm Feiao FDX & FD7 moving coil in-ear earphone

About TOP5 Headphones Most Wanted to Start with this Year

As I said on Weibo before, the TOP5 headphones that I want to start with most this year include IE900, 1697Ti, EVO and a temporarily confidential one, as well as Feiao's FD7 and FDX.

Among them, IE900 has already started, and listening to classical instrumental music is the most preferred, none. 1697Ti is attracted by the color value, and the sound is very enduring moving circle sound, but because the new product is about to go on the market, let's wait and see for the time being. EVO is the first multi-unit moving iron, which has extremely standard moving iron sound, which is both an advantage and a disadvantage (personally think), however, it can be used as a reference equipment for the front end of the test and must be entered. The secret is a friend's new product, which has not yet been finalized, but has entered the fine-tuning stage and is a very distinctive electrostatic earphone. However, FDX and FD7, because the positioning basically overlaps, just need to enter one. Both are the sound quality ceilings in Feiao headphones at present. They are excellent in quality and hearing, and, and configuration and workmanship is also the current domestic top, industry benchmark work.

Of course, if the budget is sufficient, individuals recommend FDX (if there are still goods),FD7 is also excellent (there are not many goods), and it is also worth starting with. However, because the wire and the balance vent are different, the sound between the two is still slightly different, not to mention FDX still bears the name of the 14th anniversary edition.

the ritual feeling of unpacking

Because the content has recently shifted to video, there are no photos out of the box this time, only videos, but immersive 4K videos. Interested friends can take a look.

https://www.bilibili.com/video/BV1xg411L7x2/
FDX's packaging is a bit too luxurious. The inside of the envelope is a carton, the bottom of the carton is a flannel protective cover, and the bottom of the protective cover is a solid wood box with a piano painted surface. This configuration is the only one with a full sense of ceremony. Internal accessories are also excessively rich, with a pile of tuning silicone sleeves and sponge sleeves, including SF sleeves of three sizes and replaceable tuning conduits. In short, the richness has not been exceeded by any peers in the industry.

https://www.bilibili.com/video/BV1Sq4y1U7DL/
The packaging of FD7 is relatively slightly shrunk, but the richness of internal accessories is the same, and the details can also be seen in the video.

About Acoustics

Strictly speaking, FDX should be a derivative model of FD7, built for the 14th anniversary project, so the two are consistent in acoustic architecture.

"pure beryllium diaphragm moving coil unit earphone" is the official name given to FDX and FD7. It can be seen that its acoustic core is the moving coil unit surrounding this pure beryllium diaphragm. Strictly speaking, it should be called "pure beryllium metal ball top with beryllium suspension diaphragm". The diaphragm can basically be regarded as the soul of moving coil earphone, which directly affects the sound quality and timbre.

Feiao should be the first manufacturer to put pure beryllium diaphragm into practical use. Beryllium is a toxic rare metal. There are high technical barriers in the production process of diaphragm, which cannot be completed by domestic suppliers. However, due to the technical blockade, the United States needs to record and review before supplying it. The purchase cycle of pure beryllium diaphragm takes more than half a year, which is very difficult to obtain, this is why even the unrestricted output of FD7 is not high.

Beryllium is a very excellent metal in acoustics. Its density is 1/4 of aluminum, its rigidity is 4 times that of aluminum, its elastic modulus is about 50% than steel, its sound conduction speed is about 12.6 km/h, and its response speed is 3 times that of titanium and aluminum. Therefore, it is a diaphragm material with light weight, fast response speed and good rigidity. After it is made into a unit, it can greatly improve transient response and high-frequency fineness, and can also effectively suppress segmentation vibration and avoid distortion. I personally think that pure beryllium diaphragm should be the same as Sony's liquid crystal diaphragm and JVC's wooden diaphragm, which can be listed as a milestone in the revival of the moving coil unit.

the progress of coils and magnets in recent years is also an important technological breakthrough in the sound quality leap of moving coil units. The magnetic flux of FDX and FD7 has reached 1.5 Tesla, which is already the proper level of Baia Power. The improvement of high magnetic flux on dynamic, transient and absolute analytical force is obvious, represented by the Schellan diagram and T8IE2.

FDX and FD7 both use medical grade stainless steel cavity, 5-axis CNC machining, one grinding, three manual polishing, mirror-level effect, and then PVD coloring (24K real gold plating) and hard processing. In terms of processing procedure and difficulty, it is basically the same as the frame of iPhone 12/13 Pro. Note: The hardness of the shell after this treatment is very high and the scratch resistance is very strong.

two earphones is a standard circle, derived from FD5. It is a very good axial acoustic cavity (from Avenue to Jane), and the back cavity is semi-open, which can increase the openness of the sound field. Improve the permeability of low frequency and relieve the pressure of the ear canal. In addition, an acoustic prism device is added in front of the ball top, which can allow high-frequency diffusion, improve the propagation path, and realize high-frequency control and phase adjustment. This is similar to the three-chamber sound absorption series on IE900.

adjustable catheter tuning is nothing new. FDX and FD7 are still equipped with three types of catheters as standard. The thinnest one can enhance low-frequency dynamics and is suitable for tracks that require more low-frequency atmosphere. The self-contained middle catheter is relatively balanced and adaptable to a wide range of areas. The thickest thing is to strengthen high frequency, which can improve the sense of quantity and resolution. You can try it for those who pursue string pleasing. In fact, the default middle catheter has already performed very well. Whether it is the extension of both ends (very low and very high frequency), or the performance of measurement and permeability, it is the top flow in the in-ear earphone performance.

In short, FDX and FD7 use a series of the latest acoustic technologies, both to take the sound performance of the moving coil unit to a new level, and they did.

about sound quality and timbre

Because the positions of the wire and the balance vent are different, FDX and FD7 still have a small difference in sound to some extent.

Trial conditions: both earphones use original wire, original 4.4mm plug and SF earmuff

the two are basically the same in quality, but because FDX is directly equipped with Feiao's new gold, silver and copper large ternary line (LC-RE Pro sells for 999 yuan), it is better in ductility at both ends. Because of the diamond-encrusted relationship, FDX closed the vent in the "stream" part of the shell to the top of the connecting line. This slight change in airflow structure will also be reflected in the sound, after changing the two lines, it can be found that the low-frequency part of FDX will be a little more stuffy than FD7, and the vocal part will be a little thicker, making the whole more popular. Of course, after changing back to the large ternary line, the low-frequency stuffy of FDX will be significantly improved.

resolution, both are the ceiling level of the current moving coil headphones. Whether you use large-scale classical repertoire, symphony-level film and television soundtrack, or unreasonable Japanese ACG to audition, FDX and FD7 have very strong restoration ability. There is obvious separation between instrumental music and instrumental music, human voice and instrumental music, clear phase, obvious positioning feeling and correct orientation, low-frequency musical instruments are even divided into high ground on the Y axis. Even if you use the large-scale symphony of Bei 5 to audition, you can feel the sense of regularity that each instrumental music is in its place and its responsibilities. And the restoration of small details is also quite good, and subtle overtones and blemishes can also be captured and restored.

sound field restoration: the sound field openness of FDX and FD7 is no less than that of other brand flagship moving coil headphones, and it is very regular, with a stronger sense of positioning and encirclement. when playing chorus and strong songs, there is no problem of low-frequency junction squeezing human voice, which is very easy to restore the sound field with immersion. If points are to be deducted by force, it is that the openness and boundary feeling of the sound field are not as good as IE900, which is an over-standard monster. Under the absolute large-scale organization, it is still necessary to shrink slightly.

energy distribution: when the balanced medium catheter is used, the whole is balanced, slightly to the medium and low frequencies. the density of this medium frequency is better, the vocal repertoire is relatively full, the low frequency is abundant, the atmosphere is strong, and the high frequency is not dimmed. If FD7 is used as the standard, the voice of FDX will be warmer and the voice will be more prominent.

Transient and Dynamic: Transient has long been said that it is a double-edged sword. Fast can improve the analysis, make the sound fresh and clean, and slow can make the low frequency melodious, full and full of charm. The transient of pure titanium diaphragm can be said to give consideration to both. The high-frequency part is neat, well-extended, the sound is transparent, the low-frequency part is moderate, the overtone is sufficient, and the charm is full. The style of the "beryllium-plated diaphragm enhanced version" in the sound expectation is not the same. Dynamic performance is also the advantage of pure beryllium diaphragm. The contrast between large and small sound pressures is strong, and the sound of a slight broken bow will not be concealed by the momentum of strong playing, and it is also the top level in in-ear headphones.

style adaptation: If you talk about the stunning degree of adaptation, then the pan-popular style is very compatible with FDX and FD7. The human voice is correct, delicate, rich in details, high in reduction, low-frequency enthusiasm, strong sense of encirclement, and will not dominate the host's role. High-frequency is exquisite and delicate, embellishment and brilliance; in terms of classical repertoire, because of excellent performance of conformation and sound field, I can quietly listen to a whole piece of Bei 9, which is very telling. Under the condition that I have IE900, I did not enter the wrong picking mode, which is enough to prove the excellence of pure beryllium diaphragm.

front-end matching: probably due to the high sensitivity, in order to make the background darker and better adapt to the front-end of the player, the impedance of FDX and FD7 is 50 ohms, and some small tails or bluetooth decoding earphones can have good results. however, the moving circle is a miracle. I personally recommend feiao M11 Plus and players above. after all, the plug is so expensive, users who want to buy it, there are basically "brick players. General players can handle both with medium and high gain, while QA390LE this kind of cross-desktop portable player can drive to medium gain, and overpush will occur when the volume is too large. When matched with Feiao's THX series and Kaiyin player, FDX and FD7 will be more popular and have more distribution of medium and low frequency sense. When matching Lebijia and AK players, the sound will be more balanced and the performance of classical songs will be more regular.

summary

Boy, I'm almost finished. I saw that there were too many praises. It almost overflowed the screen. This is not the cold style of my writing. However, this is also true. FDX and FD7 can be said to be the representatives of the strongest domestic moving-coil earphones, whether it is the exquisite degree of packaging and ceremony, the exquisite material selection and workmanship, or the progress in acoustics and sound. Compared with other domestic brands that dare to price more, their sound quality or listening feeling is even better, compared with some "super flagship like the emperor's new clothes, it also lacks the subjective conclusion that" high price equals Hi-Fi price.

FDX is priced at 4999 yuan and FD7 is priced at 3999 yuan, which is a great value compared with the flagship of other families. If FDX and FD7 are the two choices, I personally recommend FDX, because the wire, appearance and packaging together also exceed the price difference of 1000 yuan, not to mention this is the 14th anniversary of the world's limited number of 1000 articles.

by: October 6, 2021 by vagal reflex

website: https://weibo.com/ttarticle/p/show?id=2309404690433111359623