Do you know which type of magnet the speaker belongs to? The speaker magnets is a ferrite magnet.
Ferrite magnets are ferromagnetic metal oxides that are sintered from iron oxides and other ingredients. Generally can be divided into permanent ferrite, soft ferrite and magnetic ferrite three. Ferrite, also known as ferrite magnet, is the small black magnet we usually see. Its main raw materials are iron oxide, barium carbonate or strontium carbonate. Magnetizing, the residual magnetic field strength is high, and can maintain the residual magnetic field for a long time. Usually used as a permanent magnet material is the speaker magnet.