In the electromagnetic modules of consumer audio equipment, neodymium-iron-boron permanent magnets are employed to establish a stable magnetic field, serving as the core medium for efficiently converting electrical energy into mechanical driving force for the diaphragm. The disc-shaped and annular permanent magnets used in these modules demand exceptionally high standards for magnetic property consistency, coating adhesion, and adhesive compatibility. Enhancing these critical properties is key to pushing the boundaries of audio quality in high-end consumer electronics.