Why are permanent magnets used in speaker?

All speakers used NdFeb magnets, these magnets are often used in the mobile phone.(Iphone,Samsung,Nokia,HTC,LG,Sony,Motorola,Lenovo,Huawei,ZTE,etc.)

Many customers use Zn coating NdFeB Ring Magnet and C-Zn coating NdFeB Dish magnet in speaker, it provides a magnetic field for the speaker coil, which is embedded is the paper of the speaker cone. When the audio signal flows throw the speaker coil, it generates a small magnetic field the strength of which varies with the strength of the audio signal. This small magnetic field is repelled by or attracted to the permanent magnetic field produced by the speaker magnet. Thus the paper cone moves away from or closer towards the back of the magnet speaker. Hence as the strength of the audio signal wiggles the paper cone wiggles back and forth, and you get sound waves that match the audio signal. Only the field in front of the speaker magnet (where the speaker cone is located) is of any use. The field that comes out the back of the magnet serves no purpose, and you might as well use it to stick the speaker to the fridge. Usually Zn coating NdFeB Ring Magnet and C-Zn coating NdFeB Dish magnet can be used as speaker magnet.

Send your specification of your magnets including NdFeb magnet grades, NdFeb magnet sizes, NdFeb magnet tolerances, NdFeb magnet direction of magnetization, NdFeb magnet coating and quantity to us. Take the advantage or our competitive price unbeatable quality, reliable services and quick delivery. We provide free samples for your examination.