The so-called bonded NdFeB is to uniformly mixed NdFeB powder and resin, plastic or low melting point alloy binder, then pressing, extrusion or injection molding method into a composite NdFeB permanent magnet materials. Magnet prepared by this method have some of the following advantages: (1) because of its molding process is relatively simple, and thus easy for mass production. (2) from which the product is pressed into the mold, unlike the magnets prepared by powder metallurgy sintering process, not by the larger contraction, so that the dimensional accuracy of the product is relatively high. (3) suppression of its products made by rapid quenching powder, you can freely change the shape of the mold. (4) products can be regenerated, because the product is made from powder pressed, if the magnet is no longer needed, you can break into powder and then pressed into the desired shapes. (5) the product without sintering, no shrinkage, so its lighter weight. Bonded NdFeB permanent magnet materials have the advantage of the above and has been very good application, production expanded rapidly. But the magnet powder coated with sintered NdFeB permanent magnet materials compared to the integrated magnetic poor, but in less demanding on the magnetic properties and their fields of high dimensional accuracy was able to get a good application. Effect of the permanent magnet magnetic sound is relatively large, it is possible to affect the effectiveness of their sound. Poor performance of a speaker magnetic magnet decreases. We know that silver bullion magnet speakers are mainly dependent on the sensitivity of the permanent magnet magnetic sound within the cone of quality and assembly process of the pros and cons. We can take advantage of ferromagnetic objects to touch the magnet magnet, and then appealing to a rough estimate of the size of the magnetic strength of the magnet, if the magnetic weak, only replace the speaker. Divider exception. If the sound of the divider adverse elements, the corresponding signal band also will be blocked, and the band appeared speaker volume glitches. Then we need to check focus and subwoofer crossover parallel capacitance is a magnet shorted latte, crossover inductors and tweeter and whether there is a parallel between the emergence of layer short. Guided core leg loose. When a core pillar when the speaker's guide loose, then it will be sucked into the permeable plate to one side, so that the voice coil by squeezing therefore will impede the normal sound. Therefore, we suggest using a hand tap cone in the maintenance, if by not moving, then the most likely to be a core pillar of the voice coil is suppressed, at the same time need to be removed before we can re-cement reinstated. Magnet pass | Magnet | New Tong Xin magnetic provided by the Dongguan City, Tong Xin magnetic Limited. Xin Tong, Dongguan City, the new magnetic Limited (www.dgxtxmagnet.com/) strong, credible, in Dongguan, Guangdong magnetic materials industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the new Tong Xin magnetic and you hand into the brilliant, for a better future!