We all know that the speaker in a speaker device is the core part responsible for sound production. The speaker is a transducer that converts electrical signals into sound signals. The performance of the speaker has a big impact on the sound quality.

I. What is speaker magnet?

The speaker magnet, also known as the speaker magnet assembly, is the magnet used in the speaker.

II. How does the speaker magnet work?

When the speaker receives the electrical signals output by the audio source equipment, the current passes through the coil of the speaker and produces a magnetic field reaction. Since the current passing through the coil is alternating current, its positive and negative poles are constantly changing. When the positive and negative poles meet, they attract each other, causing the coil to be attracted towards the back (inside the box) by the magnet in the speaker. When the positive and positive poles meet, they repel each other, causing the coil to move outwardly (outside the box). This alternating movement generates sound waves and airflows and produces sound, which has the same effect as the vibration of the speaker's voice when speaking. The magnet in the speaker is used for sound production. Without this magnet, the speaker in the audio device would not produce sound.

III. How to choose speaker magnet?

The speaker magnets on the market are divided into three types: aluminum-nickel-cobalt magnets, ferrite magnets, and neodymium-iron-boron magnets.

Aluminum-nickel-cobalt magnets were the first magnets used in speakers, such as high-frequency speakers in the 50s and 60s. They are generally used as inner-magnet speakers (although there are also external-magnet types). Their disadvantages are small power, narrow frequency range, hard and brittle, and difficult to process. Moreover, cobalt is a scarce resource, so the price of aluminum-nickel-cobalt is relatively high. From a cost-effectiveness perspective, speaker magnets that use aluminum-nickel-cobalt are relatively rare.

Ferrite magnets are generally used as external-magnet speakers. The magnetic properties of ferrite are relatively low, and a certain volume is needed to meet the driving force of the speaker. Therefore, it is generally used for speakers with a larger volume. The advantage of ferrite is that it is cheap and cost-effective; the disadvantage is that it has a large volume, a small power, and a narrow frequency range.

Neodymium-iron-boron magnets have much better magnetic properties than aluminum-nickel-cobalt and ferrite, and are the most commonly used magnets in current speakers, especially high-end speakers.

The advantage is that it has a small volume, a large power, and a wide frequency range at the same magnetic flux. Currently, most Hi-Fi headphones use this magnet. The disadvantage is that the material is expensive because of rare earth elements.

Factors to consider when choosing speaker magnet:

1. We need to clarify the working environment temperature of the speaker, and choose which magnetic material to use based on the temperature. Different types of magnets have different temperature resistance characteristics, and they also have different maximum working temperatures. When the working temperature of the magnet exceeds the maximum working temperature, magnetic performance degradation and demagnetization may occur, which will directly affect the sound effect of the speaker.

2. We must consider the magnetic flux requirement and magnet volume to select the speaker magnet. The larger the speaker magnet is, the better the sound quality is not necessarily. The impact of magnet magnetic flux on speaker sound quality can be seen. We need to consider the limitations of the speaker's volume on the magnet's volume and the requirements for the permanent magnet magnetic flux performance.

Summary

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