Moving iron earphone is a kind of earphone which transmits to the center point of a micro diaphragm through a precise connecting rod to generate vibration and sound. The moving iron earphone can be easily inserted into the ear canal due to its much smaller unit size.
Moving iron earphone is a kind of earphone which transmits to the center point of a micro diaphragm through a precise connecting rod to generate vibration and sound. The moving iron earphone can be easily inserted into the ear canal due to its much smaller unit size. This method effectively reduces the area of the ear and can be inserted into the deeper part of the ear canal. The geometric structure of the ear canal is much simpler than that of the auricle, and it belongs to a quasi circular shape. Therefore, a soft silicone sleeve has a good sound insulation and leak proof effect compared with the traditional ear plugs.
Inside the moving iron earplug, the voice coil is wound around a precision iron piece called “balance armature” in the center of the permanent magnetic field. Under the action of magnetic force, this piece of iron drives the diaphragm to make sound.
The moving coil directly drives the diaphragm, while the moving iron is transmitted to the center of a micro diaphragm through a precision connecting rod, thus producing vibration and sound.
The sound insulation effect of moving iron is better than that of moving coil. Due to the large area of the moving coil unit and the need for more space and air to participate in the vibration in the process of sound production, the leakage phenomenon can not be effectively controlled; the moving iron can effectively reduce the area of the ear part, and can be put into the deeper part of the ear canal. (almost all moving earphones have air holes, while those on moving iron earphones are rarely seen. Ck9 is an exception.) Because the geometric structure of the ear canal belongs to the quasi circular shape, which is much simpler than the auricle, a soft silicone sleeve has been able to play a good sound insulation and leak proof effect compared with the traditional earplug.
The sensitivity of moving iron is higher than that of moving coil. The main reason is that the structure of moving iron unit is almost a closed container structure, which can be driven by a little current. Here, we should pay attention to the relationship between sensitivity and resistance. Because of its high sensitivity, the dynamic performance of the moving iron earphone is better than that of the dynamic performance, instantaneous detail performance and sound density of the music.
The frequency response curve of moving iron earphone is more stable. There are some audible changes in the frequency response curve of moving coil earphone in different temperature, humidity and using process. The moving iron shows good stability, which makes the sound quality more stable and reliable, and is not easy to change. One of the most important reasons is that the moving iron units are almost made of metal materials, which are formed by high-precision molds. The vibrating diaphragm of the moving coil unit is generally combined with the coil through glue, so there are a lot of influence elements inside, and there are many individual differences. Therefore, the electroacoustic performance of the unit compared with the moving coil is much more stable.
Moving iron is smaller and lighter. This is due to the characteristics of the moving iron unit. The diaphragm weight of the moving iron rises linearly with the increase of the unit diameter. Therefore, the movable iron is more suitable for small ear plugs, and it is impossible to make open or semi open earplugs. That’s why moving iron technology is only used in earplugs.
Moving iron earphones help protect hearing. The moving iron earplug generally has good sound insulation effect, and its high sensitivity makes it possible to perform well at a small volume. Therefore, pure sound can be appreciated without increasing the volume in noisy environment. Moving iron unit is widely used in medical, health care, aviation, military and other fields. Hearing aids are common. Doctors will not recommend products that may harm the patient’s health, and most of the well-known hearing aid brands use moving iron units, so moving iron earphones are more reliable than moving coil earphones.
The sound quality of moving coil earphone mainly depends on the material of diaphragm and the material and structure of cavity in hardware, while the driving ability of earphone is mainly determined by magnet. The design of cavity plays an important role in the sound performance of moving coil earphone. From the above, we have a general understanding of the basic structure of moving iron, and the parts and moving circles that determine the sound quality of moving iron earplugs are obviously different.
首先，动铁耳机的腔体对声音素质的影响很小。这是动铁的一个显著的特点。动铁的腔体主要作用是固定动铁单元和出口的稳固性，没有严格而固定的要求。这就是为什么连铁三角这样一丝不苟的厂商在生产 CK9 时，对壳体的处理也表现得不拘小节的原因。只有前端的导口由于要固定单元和填充材料，要求密封性较高，对模具要求也相当苛刻。一些玩家，甚至个别老鸟经常煞有介事的讲某动铁耳塞的腔体怎样怎样，所以声音怎样怎样的，基本上可以从理论层次确定全部是臆造的言论。其实只要腔体能够做到良好的密封性就不会对声音表现产生影响。
First of all, the cavity of moving iron earphone has little effect on sound quality. This is a remarkable feature of moving iron. The main function of moving iron chamber is to fix the stability of moving iron unit and outlet, without strict and fixed requirements. This is why even such a meticulous manufacturer as the iron triangle in the production of ck9, the treatment of the shell is not strict with the details. Only the front-end of the guide because of the fixed unit and filling material, high sealing requirements, die requirements are also very harsh. Some players and even some old birds often talk about how the cavity of a moving iron earplug is, so what the sound is like can basically be determined from the theoretical level that all the statements are fabricated. In fact, as long as the cavity can achieve good sealing, it will not affect the sound performance.
Compared with the moving coil, the moving iron unit has more precise internal structure and higher production cost (it should be noted that this is not the main reason for the high price of moving iron earphones). It is the basis of the sound quality of headphones. The advantages of moving iron compared with other earphones are mainly reflected in it. A good earplug must use excellent unit.
其实动铁的声音素质还有更加重要的一方面。同样采用单单元的 ER4P 声音素质要高出 UM1 很多，当然单元占一部分原因，但另一方面更取决于动铁耳塞腔体内部，单元与壳体接触连接的元件——密封圈。这个密封圈体现了动铁耳机厂商一半以上的技术水平。动铁耳机的难点不仅在于单元，更在于这个小小的密封圈部分。这个胶圈的作用一是进一步增强单元的密封性，二是对声音起传导修饰作用。不同的调音材料、不同的工艺技术填充进去就会出现不同的声音表现。相比动圈，动铁的调音基本上在于密封圈的材料和构造的调节。其调节水平要求极其精确的技术水平，这也就主要决定了动铁耳机的生产难度。因此，动铁不是只有单元就可以生产的，不是那种山寨小厂可以像动圈那样随意拼装就能做出好声的。
In fact, the sound quality of moving iron has a more important aspect. The sound quality of er4p with single unit is much higher than um1, of course, the unit accounts for a part of the reason, but on the other hand, it depends on the element inside the moving iron earplug cavity, which is connected by the unit and the shell. This sealing ring reflects more than half of the technical level of mobile earphone manufacturers. The difficulty of moving iron earphone is not only the unit, but also the small sealing ring. The function of the rubber ring is to further enhance the sealing of the unit, and the other is to conduct and modify the sound. Different tuning materials and different technology will produce different sound performance. Compared with the moving ring, the tuning of moving iron basically lies in the adjustment of the material and structure of the sealing ring. Its adjustment level requires extremely accurate technical level, which mainly determines the production difficulty of moving iron earphone. Therefore, moving iron is not only a unit can be produced, not the kind of Shanzhai small factory can be like moving coil as random assembly can make good sound.
The technologies mentioned above belong to the core trade secrets, so neither Shure, UE nor Intemet disclose any more technical details to the outside world. This is one of the reasons why people generally know little about moving iron. To illustrate, the above is only from the hardware, structure analysis. As with the moving coil, there are many factors affecting the moving iron earphone, which are difficult to list one by one.