MC evaluated Feiao FD5 at the beginning of this year, it was FD1 less than 400 yuan that supported the "facade" of FD series. Unexpectedly, when I received FD7 at the end of the year, I briefly combed Feiao's earphone product line and found that in just a few months, the FD series, which represents pure moving coil earphones under Feiao, has already owned 6 products, becoming the second only to FH ring iron mixed series, and the product richness ranks second in Feiao earphone line. It can be seen that Feiao has made a good contribution to moving coil earphones this. The FD7 to be auditioned today is the flagship product of FD series at present. The moving coil material it uses is worth mentioning.

Specifications

way of wearing: around ear into ear

cell type: 12mm super large pure beryllium diaphragm

Frequency response range: 10Hz to 40kHz

horn impedance: 50 Ω @ 1kHz

Headset sensitivity: 111dB @ 1mW

Maximum power: 100mW

Operation: MMCX

wire type: high purity single crystal pure silver wire

Connection length: approximately 120cm

Single weight: 11g

reference price: 3999 yuan

"black gold" color matching is more mysterious than one point

still talk about product design first. The emergence of FD7 has made FD5, which was previously the flagship of the FD series, retreat to the position of the sub-flagship, but they use the same design language-3D relief covers like mountains, rivers, waterfalls and flowing water, with a smooth and smooth cylindrical cavity. However, compared with the silver FD5,FD7 uses the exclusive color scheme of "Kurokawa Jinliu", which is more mysterious and noble. The stainless steel cavity polished by several processes shows a mirror reflection effect. After PVD coloring and hardening, the whole body is titanium crystal black.

four mirror curves with ups and downs and different widths penetrate the cover, which has a strong three-dimensional effect. The "gully" between the curves is golden, and the rest of the cover is a delicate matte coating. The "exposure and development" technology makes the collision of the two processes spark. In indoor and outdoor, under different lighting environments, the face cover and cavity of FD7 will have different visual perception, either black, calm and heavy, or shining, with strong metal texture and rich visual changes. In addition to the consideration of visual beauty, the design of the face cover also takes into account functionality.

▲ The small holes in the golden area on the FD7 side are not only decorative, but also have the effect of quickly releasing pressure.

FD7 adopts a semi-open rear acoustic cavity design, with dense and regular small holes in the golden part between the curves of the cover. Their function is to quickly release the pressure, relieve the pressure of the user's ear canal, make the sound more authentic and durable, and bring the user a more comfortable listening effect.

can be changed from "head" to "tail"

Feiao headphones has not been bad, because it likes to apply various replaceable designs to headphones. As the flagship positioning, FD7 naturally has a complete set of interchangeable designs from "head" to "tail. The first is the design of replaceable earphone cable, and the mainstream MMCX interface has strong adaptability. FD7 comes standard with a high-purity single crystal pure silver wire, which is woven by Litz, and the total number of 4 strands of wire cores is as high as 224. The wire is wrapped by imported environmental protection TPU material, which can effectively improve the yellowing of the wire body and hardening in low temperature environment after long-term use.

▲ Although the MMCX interface position of the earphone line is such a stainless steel arc treatment, it takes a lot of energy.

worth noting is the design of the MMCX connector part of this earphone line. Compared with the cylindrical connector of the previous earphone line, Feiao designed it into an arc shape this time, and adopted the same stainless steel material and processing technology as the earphone cavity, bringing the overall effect more uniform and beautiful. Although it is only a change of details, its actual processing difficulty is similar to that of an ear shell.

▲ FD7 adopts MMCX replaceable line design. At the same time, the plug part of the earphone line adopts in-line replaceable structure. Three plugs of 2.5mm/3.5mm/4.4mm are standard. One line meets the needs of different equipment of users.

wire plug adopts in-line replaceable structure design, and comes standard with complete 2.5mm/3.5mm/4.4mm three plugs at one time. For most users, even if they do not purchase additional earphone wires, the standard earphone wires can also meet the needs of accessing various equipment.

▲ FD7 has a design of interchangeable sound conduits. Three pairs of interchangeable sound conduits are equipped with standard sound styles corresponding to low-frequency dynamic, balanced tuning, and high-frequency resolution.

In addition to the change of the earphone cable plug, FD7 itself also has a replaceable sound catheter design. It comes standard with 3 pairs of interchangeable sound ducts, which correspond to low-frequency dynamic, balanced tuning, and high-frequency analytical sound styles. Compared with FD5, there are more pairs of high-frequency sound ducts. The principle is to strengthen different audio areas by adjusting the inner diameter size of the acoustic duct. It can be said that the FD7 "head" to "tail" are interchangeable design, which not only makes it more applicable, but also increases the variability of sound.

▲ FD7 has a wealth of accessories.

in terms of accessories, FD7 is richer than FD5, after all, the positioning is also higher. The main difference lies in the matching earplug sleeves. FD5 provides 13 pairs, including 3 pairs of low-frequency sleeves, 3 pairs of balanced sleeves, 3 pairs of vocal sleeves, 2 pairs of three-section sleeves and 2 pairs of sponge sleeves, while FD7 is increased to 16 pairs, with 3 pairs of SpinFit earplug sleeves as standard.

HB5 storage box, which is sold in 99 yuan on e-commerce, is also standard for FD7. The texture of the compressed leather is naturally textured, and the wiring is regular. The FiiO nameplate is a finishing touch design, and the overall grade feels good. I like its yellow and blue color matching very much, which is eye-catching and not gaudy. Magnetic belt buckle, opening and closing feel very good. The crystal super-soft fabric and velvet lining inside, together with detachable spacers, can not only better protect the earphones placed in them, but also flexibly combine the placement positions of various items. In addition, practical accessories such as MMCX quick-release aids, cleaning brushes, and magnetic wire clips are also part of FD7 accessories.

falling into "mortal"

In fact, FD7 products were established earlier than FD5, so it is not difficult to understand that they adopt a consistent appearance design. It is even likely that FD7 design first and FD5 later. But why is it released later than FD5? The main reason is that the diaphragm material it uses is very scarce, the R & D molding production is difficult, the procurement time is long, coupled with the well-known environmental factors in the past two years, resulting in the delay of FD7 research and development. The key to its late arrival is the pure beryllium metal ball top coated with beryllium suspension diaphragm. Perhaps you rarely see this type of diaphragm, because beryllium is a rare metal and has high technical barriers from mining, refining to processing.

▲ The picture is from the official website of Feiao

pure beryllium flakes are very brittle and difficult to bend, and it is not easy to press out through a mold like the familiar titanium and aluminum films. At the same time, the domestic diaphragm processing technology cannot be formed. At present, only the United States has mastered this technology in the world, because the technology blockade can only be bought through filing and examination. It can be seen that the cost of using beryllium as a diaphragm material is very high, both in terms of the raw material itself and the difficulty of making the finished product. Moreover, money may not be available in time. It is reported that pure beryllium diaphragm is currently purchased for more than half a year. However, pure beryllium material has the characteristics of light weight and strong rigidity, and is an excellent material for making diaphragm. Due to the scarcity of pure beryllium materials and the extremely high price, there are very few earphones using true pure beryllium diaphragm units in the market. At present, on domestic e-commerce platforms, it is relatively easy for consumers to buy earphones using pure beryllium diaphragm in single digits, and the selling price is more than 10,000 yuan. However, the emergence of FD7 has directly lowered the price of pure beryllium diaphragm earphones in the domestic market from more than 10,000 yuan to less than 4000 yuan. It is not too much to say that it is the driving force for pure beryllium diaphragm to fall into the "mortal world.

, let's look at the characteristics of FD7 diaphragm. The rigidity of pure beryllium is 4 times that of steel, and its weight is only 1/4 of that of titanium, which makes its sound conduction speed very fast, and its response speed is 3 times that of titanium and aluminum. It can be made into a diaphragm that can greatly improve the transient response and high-frequency fineness of headphones. The extremely high rigidity can reduce the vibration of the diaphragm separation and reduce distortion.

▲ The picture is from the official website of Feiao

in other acoustic designs, FD7 adopts a high magnetic density external magnetic structure design of up to 1.5 Tesla to ensure stronger energy output. Compared with FD5 with 32 Ω impedance, FD7 impedance is increased to 50 Ω, which will perform better in bottom noise control. Feiao also installed an acoustic prism device in the front cavity close to the top of the diaphragm, so that the center and edge of the horn diaphragm can synchronize to the sound mouth to obtain more accurate high-frequency junction images and smaller phase deviation.

▲ The picture is from the official website of Feiao

In addition to the semi-open cavity design mentioned earlier, it also adds a "volcanic pile" structure to the back cavity design, using the principle of standing wave formation to enhance the low-frequency diffusion of the back cavity, reduce standing waves and reduce distortion. At the same time, there is no curve mutation point inside the cylindrical cavity structure, and the resonance and reflection inside the sound wave transmission will be greatly reduced, which is also helpful for improving the sound quality performance.

audition experience

FD7 has many replaceable designs from "head" to "tail", what is the experience when replacing the earphone cable? When replacing the earphone cable, the MMCX quick-release auxiliary in the FD7 accessory plays a big role. It only needs to aim its notch at the junction of the earphone and the earphone cable, and can separate the MMCX pins with a little force, which completely solves the problem that it is not easy for users to use.

When replacing the plug of the standard earphone cable, you only need to rotate the female end to separate from the male end, and then hold the male end and pull it out. However, due to the smooth surface of the plug, it is more difficult to directly pull out the male end by hand. You can wrap the plug with flannel and then pull it out, which will be much easier. Before replacing other plugs, find the bump on the inner side of the female end, which is used to assist in positioning. At this time, align it with the groove on the male end and push it in, then rotate the female end and tighten it, and the plug will be replaced. Due to the fool-proof design of bumps, users do not have to worry about misinsertion.

The acoustic duct of FD7 is fixed or disassembled by screwing, which is convenient to replace. The three different styles of acoustic ducts it comes standard with are marked by green, black and red coil colors in addition to size distinction. At ordinary times, there are also corresponding functional marks on the metal base where idle acoustic ducts are placed. The wearing experience of FD7 is comfortable, and the default acoustic catheter and silicone sleeve can have good comfort. The round back cavity of the earphone is tightly combined with the ear cavity, and the silicone sleeve is filled in the ear canal with moderate pressure. After wearing it, you can feel a good passive noise reduction effect, but because it is a semi-open design, this pressure will not increase when listening to music, and it is suitable for longer use. At the same time, the arc-shaped design of the earphone wire connector part can better fit the ears, with delicate touch and both beauty and practicability.

According to the wearing experience and sound style, I chose the medium-sized equalization sleeve and the "balanced tuning" sound conduit, and listened under the balance interface. When I first heard it, the metal line feeling brought by the pure beryllium diaphragm can still be felt, and my rigid side can be felt. After 100 hours of continuous cooking, the sound quality of FD7 has been better released-the lines have become silky while still maintaining a pure and beautiful sense of hearing, and the transient and resolution have a very good standard, just like a martial arts master who "moves softly with rigidity and punches vigorously and powerfully".

, when listening to FD5, although its sound field was well-defined and accurate in positioning, its sense of space could only be said to be just right. It was OK to perform instrumental solo or small woven music, and it was somewhat difficult for it to go to a large scale. So FD7 impressed me at the beginning with its sound field. It can be said that it has the top sound field space in the in-ear earplugs. It is open enough and clear. In classical music, you can feel the accurate positioning between instrumental music. When listening to the larger woven music and the atmosphere When the original sound of the movie is very strong, it is easy to immerse people in it.

FD7 will also be noticed for the first time. In listening to the music of the violin solo, the listener will feel a feeling of going straight through the sky-a clear and stretched sound, with enough extensibility, rich details, and at the same time not too exciting. The pure beryllium diaphragm is very good Integrate the characteristics of rigidity and flexibility. I like to use it to listen to the performance of various instrumental music, capture the details of their sounds and the charm of real restoration, which is very fun.

FD7 is true for the restoration of human voice. It will create a full and vivid singer image in front of the listener, with a moderate "ear licking feeling", which is not excessive. In addition to the complete and audible reduction brought by the transmission of sound details to the listener's ears, FD7 also weakens the interference of dental sounds to the sense of hearing. Even in Liang Jingru's music, it can be well felt. Control of dental sounds. This characteristic of FD7 intermediate frequency, coupled with excellent sound field performance, is fully performed in Lin Junjie's head recording album "Dialogue with Yourself", which I often use as audition music, so that people can feel the space and presence that were only found in big headphones in the past on FD7.

in low frequency performance, FD7 can well show the continuous low frequency scene, with deep diving depth and rapid rebound. Although the sense of quantity is not exaggerated, it is also a good level in moving coil headphones. The hierarchy between the medium and low frequencies is clear and the transition is natural, and the performance of the medium frequency will not be weakened by the increase of the low frequency. In creating a powerful and open music scene, the low frequency of FD7 plays well.

can be said that FD7 exceeds FD5 in overall sound quality. The two are similar in the design of acoustic structures and the application of characteristic technologies. The key to this difference lies in the pure beryllium diaphragm applied by FD7. Feiao's engineers did not waste this good material, adjusted it in place, and gave full play to the characteristics of pure beryllium diaphragm.

Generally speaking, the word "cost performance" often appears in entry-level products. However, in Feiao FD7, I think these three words are very applicable-it has excellent presentation from material selection technology to sound performance, especially the sound quality level is regarded as the head camp in the current moving coil headphones, but it has maintained restraint in pricing. From FD7, we can see that flagship products can also have "cost performance", especially when the price of similar products is two or three times or more. Feiao used pure beryllium diaphragm as a "good material" and "cooked" FD7 as a "good dish". The price is not expensive. You should really listen to it.

author:Microcomputer Official Microblog11-23 10:51

website: https://weibo.com/ttarticle/p/show?id=2309404706648408326574