Speakers are generally made up of the key components of the T-iron, magnet, voice coil and diaphragm. Generally speaking audio magnets will use ferrite, alnico and ferrites. Next, it is important to consider the flux requirements and magnet volume to choose the speaker magnet. From the magnet performance on the speaker sound output quality, we can find that the magnetic flux of the magnet on the speaker sound quality is very large, the same volume of the case, the magnet performance: NdFeB>Alnico>Ferrite; in the same flux requirements, NdFeB magnets require the smallest volume, ferrite is the largest. The same magnetic material (the same material and the same performance), the larger the diameter, the greater the magnetic susceptibility, the greater the relative power of the speaker, the speaker's sensitivity is relatively higher, the better the transient response.
The magnetic properties of NdFeB are far better than AlNiCo and ferrite, and it is currently the most used magnet on the speakers, especially the high-end speakers. Its advantage is the same magnetic flux under its small size, high power, wide frequency range, the current HiFi headphones basically with such magnets.
