High-power woofer is generally use China Ferrite Magnet because of its high power and high temperature in the magnetic gap. General neodymium magnet may cause irreversible magnetic decline, but ferrite is generally fine.
This more than likely stems from the same price, when it comes to the size of the woofer, which Neodymium Permanent Magnets use. Of course, if you do not pay attention to the cost (dozens of times the price), neodymium magnetic in the case of ensuring heat dissipation, can obtain better magnetic density, better bass control.
Neodymium Magnet is very expensive and does not have high temperature resistance. It is commonly used that H grade begins to demagnetize when it exceeds 120 degrees Celsius. It reaches the Curie point of over 300 degrees Celsius, completely demagnetized.
High Quality Ndfeb Magnet is used in large caliber speakers, embedded speakers and ultra-low frequency speakers. Embedded because of thickness requirements, now the thinnest embedded speaker can do only 9 cm thickness, and the power, sound quality and ordinary speakers are the same, which requires the bass unit must use neodymium magnetic assembly. The embedded subwoofer I know is 85mm thick (95mm mounting depth), and the 10-inch unit has 150 watts of sustained power and a sound pressure of 109 decibels.
If it is a normal speaker, the volume thickness is not required, will not use the more expensive neodymium magnet.
Post time: Oct-22-2022