The horn unit with neodymium iron boron magnet has strong magnetic force, small size, light weight and relatively high price. Many friends think this is a symbol of high-end speaker unit, it seems that the sound will be better if a neodymium iron boron magnet is used. In fact, this is a misunderstanding. In actual work, neodymium magnets with high nominal working temperature actually begin to drop sharply when the temperature is above 80 degrees. Only after cooling down again, there is no loss of magnetism. Do not think that the nominal 200 degrees is definitely no problem, and we know that the temperature of the voice coil is very high when the professional loudspeaker unit is working for a long time and high power! Therefore, please be careful to choose a speaker unit with neodymium magnets. If you use a neodymium magnet unit, please configure the system with a larger margin (more speakers, more power amplifiers).