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Speakers or loudspeakers belong to the electroacoustic industry and can not lack permanent magnets. Magnets are mainly annular in shape, also known as horn speaker ring magnets. At present, the speaker materials on the market mainly include ferrite materials, neodymium magnets and samarium cobalt magnets. How to choose? Today, Courage, a Chinese permanent magnet manufacturer, will take you to know.
AlNiCo is the earliest magnet used for loudspeakers, such as the tweeters in the 1950s and 1960s, which are generally made into internal magnetic speakers (there are also external magnetic speakers).
The disadvantages are small power, narrow frequency range, hard and brittle, and inconvenient processing. In addition, cobalt is a scarce resource, and the price of aluminum, nickel and cobalt is relatively high. From the perspective of cost performance, the horn magnet uses less aluminum nickel cobalt.
Ferrite magnets are generally made into external magnetic horns. The magnetic property of ferrite is relatively low, and a certain volume is required to meet the driving force of the horn. Therefore, it is generally used for higher volume audio speakers. The advantages of ferrite are cheap and cost-effective.
The disadvantages are large volume, small power and narrow frequency range.
Neodymium iron boron magnet is far superior to aluminum nickel cobalt and ferrite in magnetism. It is the most used magnet on loudspeakers, especially high-end loudspeakers, Small volume horn, For example, car speakers..
The advantage is that under the same magnetic flux, it has small size, large power and wide frequency range. At present, HiFi earphones basically use rare earth neodymium magnets.
The disadvantage is that the price of materials is much higher than that of ferrite due to the use of rare earth elements.
Several factors to be considered when selecting horn magnet
The working ambient temperature of the horn shall be determined, and the magnetic material shall be selected according to the temperature. Different types of magnets have different temperature resistance characteristics, and the maximum operating temperature they can withstand is also different. When the working temperature of the magnet exceeds the maximum working temperature, the phenomenon of magnetic property attenuation and demagnetization may occur, which will directly affect the sound effect of the speaker.
We must consider the magnetic flux demand and the magnet volume to select the horn magnet. The loudspeaker magnet is not as loud as possible. It can be seen from the influence of the magnet performance on the sound quality of the speaker that the magnetic flux of the magnet has a great influence on the sound quality of the speaker. We need to consider the limitation of loudspeaker volume on magnet volume and the requirement of permanent magnet magnetic flux performance.
In a word, if you want to improve the quality of the horn, you should choose the appropriate horn magnet. At the same price, you should choose the horn magnet with large diameter. At high temperatures, you should choose the Nd-Ni-Co magnet. If you want to use the rare earth horn magnet, it will be smaller and more convenient. I hope that these can help you reduce the trouble of purchasing.
Specification of commonly used horn ring magnet;
Strong Ring Horn Magnet 70x32x15mm Y25
220mm large ring magnet OD220 x ID110 x T20/25 mm
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