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Do you who pursue HIFI know these secrets of dynamic headphones?

2021-03-18 621
What the hell are the headphones? I believe no one knows this year. To put it simply, each pair of earphones is composed of a pair of conversion units, which receive the electrical signal from the media player, and use the speaker unit close to the ear to convert the signal into an audible sound wave.

With the prevalence of portable digital products, earphones are increasingly used in radios, walkmans, handheld game consoles and now smart phones. Of course, they can also be used in desktop players, computers and Hi-Fi speakers.

As for why use headphones? Naturally, it is possible to listen to music alone without affecting others. At the same time, the sound of the surrounding environment can also be isolated through specially designed earphones, such as in-ear earphones, closed monitor earphones, etc. It is very helpful for people who use it in noisy environments such as recording studios, DJs, traveling, sports, etc.

But what is the difference between this headset and that headset? What do those unit technologies such as moving coil, moving iron, coil iron, static electricity, etc. mean? What do different material technologies mean? Do you know all this?

What is a dynamic headset?
Among the earphones currently available on the market, most of them are earphones with dynamic technology. Its structure is similar to the speaker of a sound box. A cylindrical coil wound in a permanent magnetic field is connected to the diaphragm, and the coil drives the diaphragm to produce sound under the drive of a signal current.

The difference between the moving coil unit and the general speaker is the difference in the diaphragm. The edge of the diaphragm of the speaker speaker is generally fixed on the elastic medium (folding ring and centering support piece) (for example, on the large-diameter woofer). The diaphragm is generally flat and conical, and the elastic medium provides the force of the vibration system; in the moving coil earphone, the edge of the diaphragm is directly fixed on the frame of the drive unit, the diaphragm is wrinkled, and the force of the vibration system is complete. It is provided by the expansion and contraction of the diaphragm itself and the deformation of the folds. Therefore, the material selection and shape design of the diaphragm of the moving coil headphone drive unit have a great influence on the final sound quality of the unit, and it is also very delicate.

Do you who pursue HIFI know these secrets of dynamic headphones?

What is the sound performance of dynamic headphones?
The sound of traditional dynamic headphones is very comprehensive, often a unit can have a wide frequency response range, and because of the large size, the sound performance is looser, natural and full, and the low volume feels abundant, but it will be easy if you are a little careless Affect the clarity and detail performance of the sound.

Although the technology of the moving coil drive unit is now very mature, there will be no major changes in the structure. However, the development of permanent magnets with higher magnetic density, or the development of more ideal diaphragm materials and diaphragm designs, can still bring significant sound improvement. And generally speaking, the larger the diameter of the drive unit, the better the overall performance of the headset, but the use of materials and the design of the structure are more difficult.

Do you understand the difference between these diaphragms?
Generally, the speakers of dynamic headphones are made of ordinary plastic diaphragms, so traditional dynamic headphones generally give people the impression of blurry details, slow transient response, and insufficient resolution.

Metal diaphragms, such as aluminum diaphragms, beryllium diaphragms, titanium diaphragms, etc., are characterized by fast heat conduction, high specific elasticity, and good moisture resistance. The disadvantage is that the damping is small, which will increase the peak and valley of the frequency response curve and make the trailing edge The transient effect becomes worse. If the tuning is not good, it is easy to have a dry and harder sound.

Among them, as a domestic HiFi brand that focuses on headphone unit design, one of FIDUE’s core speaker technologies is Ti-Tech titanium diaphragm technology, which uses high temperature according to its own proportion and time combination to evenly distribute titanium nanoparticles to the fiber In the thin nano-level polyester diaphragm, the resulting titanium polyester diaphragm is more flexible and elastic than the general titanium molecular coating in the past, and the thickness of the second-generation diaphragm is 30% lower than that of the first-generation product. %, the intensity is increased by 50%, and the efficiency of the transient response is higher. Therefore, the resolution of the treble, the mellowness of the midrange and the dive of the bass have all been improved. This will once again subvert the previous concept that titanium diaphragms are only suitable for designing mid- and high-frequency units.

The bio-diaphragm uses a kind of bio-fiber produced by bacteria digesting carbohydrates. After it is cultured to 2mm, it is dehydrated, and then compressed to a thickness of 20μm with the mold used to make the diaphragm. This kind of biological diaphragm has good sound density and rigidity, and the structure has the unique slenderness of paper, so it can express a more natural sound. But the disadvantage is that the durability is not high, and the sound changes greatly with the passage of time.

The wood diaphragm is made by slicing logs into slices with a thickness of 80μm, and then undergoing processes such as softening-stamping-repeated fixing and forming. The original characteristics of wood such as easy cracking, deformation and insufficient toughness are avoided, and the service life is increased, but the thickness is relatively high, and the resolution is relatively low. The carbon nano-diaphragm has proven to have some very excellent characteristics. Its characteristic is that the middle frequency is rigid enough and the low frequency elasticity is good, but the disadvantage is that the high frequency details are not very bright.

The liquid crystal polymer diaphragm is formed by pressing the liquid crystal polymer material in the mold. According to Sony’s official statement, the liquid crystal polymer film diaphragm is hard and sensitive, and can provide the hardness and internal loss required to restore balanced and highly accurate mid- and high-frequency sound quality, achieve high-definition mid-range and treble effects, and more specific details. It is not known.

The above are several common diaphragm technologies and representative works. Of course, the types of diaphragms are far more than these. In order to find good sound, people are constantly trying new materials and technologies, as well as graphite diaphragms and polypropylene diaphragms. Magnesium silicate polymer conforms to diaphragm, aramid woven diaphragm, etc.
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