Small Magnets, Big Revolution: How Neodymium Ignites the New Wave of Audio? Speaker Magnets​

"Have you ever thought that magnets in a speaker smaller than a coin can shake up the entire audio industry?" When traditional speakers are still compromising with bulky magnets and distorted bass, neodymium magnets have quietly set off an acoustic revolution - it releases nearly 10 times the magnetic energy with 1/10 of the volume, making "small size, big energy" no longer a legend. Today, we will reveal the secret of how this magnetic king make your product a blockbuster in the competition.

Working Theory and Core Value of Neodymium  Magnet Speaker

Most magnetic speakers use a symmetrical ring design to facilitate uniform distribution of the magnetic field and efficient coupling with the voice coil. NdFeB magnets can provide a stable static magnetic field for magnet speaker, which is a prerequisite for the movement of the voice coil. When the audio current passes through the voice coil, the alternating magnetic field interacts with the magnetic field of the magnet , generating a Lorentz force that drives the voice coil to move. The speaker magnet with high magnetic energy product can enhance the magnetic field strength, so that the voice coil can obtain greater driving force and significantly improving the energy conversion efficiency.

Historical Comparison and Material Advancement

Early excitation coil solutions were eliminated due to high energy consumption and electromagnetic interference problems, and permanent durable loud speaker magnets became the mainstream choice for modern speakers.

The material composition of speaker magnet has shifted from the predominant use of ferrite to the widespread adoption of NdFeB. The magnetic energy product has increased by 5-10 times. Neodymium speaker magnets have high coercivity and can withstand high-power transient signals without demagnetization, avoiding popping distortion, making it possible for modern micro speakers to achieve high fidelity.

The Difference Between Ferrite Magnet and NdFeB Magnet

Application Scenario Selection of Ferrite and NdFeB Speaker Magnets

Ferrite speaker magnets: suitable for high-power speakers, that is, professional audio equipment that requires stability and high temperature resistance; or home speakers or car speakers that are not sensitive to volume, which can reduce costs; if the environment is harsh, such as industrial environments with high temperatures or more magnetic field interference, ferrite materials are also selected.

Ferrite speaker magnets

NdFeB speaker magnets: suitable for some portable devices, such as headphones, Bluetooth speakers and other miniaturized devices, which often have high fidelity requirements.

Secondly, high-end audio systems that pursue sensitivity and dynamic range or professional recording equipment that requires high power output and wide-band response also choose NdFeB magnets.

NdFeB speaker magnets

Comprehensive recommendations

If you have extreme requirements for sound quality, volume and power, and have sufficient budget, NdFeB magnets are better for magnetic speaker;

Ferrite magnets are more practical in high temperature environments, cost-sensitive or large-volume designs.

The pros and cons of the two speaker magnets are not absolute, and you need to weigh performance, cost, and environmental adaptability according to actual needs to choose the best speaker magnet for your speaker.

The key factors affecting the life and sound quality of the best magnetic speaker

The core maintenance measures are as follows:

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  ‌Moisture and dustproof‌: Avoid spraying liquid directly onto the speaker during cleaning, wipe the surface of the host with a wrung towel, and ventilate and dehumidify after cleaning; reduce window opening on dusty roads, switch the air conditioner to internal circulation, and regularly use cotton swabs to clean the dust on the magnetic head and laser head.

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  ‌Temperature control‌: Avoid exposure to the sun or extremely low temperature environments. The working temperature is recommended to be kept at 18-45°C. Do not increase the volume immediately after high temperature.

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  lUsage specifications:‌Power on and off sequence: Turn on the sound source first and then the amplifier. Turn off the amplifier first and turn down the volume when shutting down; avoid suddenly adjusting to the maximum volume to prevent the coil from burning or the amplifier from overloading.

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  Physical protection: shockproof (handle with care), high temperature/humidity proof.

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  Cleaning and maintenance: clean the disc, tape, and USB interface regularly to reduce the wear of dirt on the magnetic head.

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  Circuit protection: use regular accessories (such as USB flash drives and cables) to avoid interfaces being burned due to inferior products.

  
  

  
  

  Ferrite magnets VS Ferrite magnets
  

Speaker Magnet types in Different Audio Equipment

1.Home theater audio magnet‌

Mostly use neodymium speaker magnets, some low-end models use ferrite magnets. Neodymium magnets have high magnetic energy density (more than 3500 gauss), ensuring high power output and wide frequency response, supporting Dolby Atmos and other sound effects technologies.

‌2. Bluetooth speaker magnet‌

NdFeB magnets are used in magnetic bluetooth speaker because they are suitable for miniaturized design, with a volume of only millimeters, fit for micro speaker units; They also support wide frequency response, high sensitivity, and low power consumption, which caters to the battery life requirements of wireless devices.

‌3. Stage audio magnet‌

Mainly choose ferrite magnets, some high-end models use neodymium magnets. Ferrite magnets are large in size, but their high temperature resistance makes them suitable for long-term high-power operation, and are suitable for high-power amplifiers and complex outdoor environments.

‌4. Intercom magnet‌

Ferrite magnets are mainly used in intercom speaker. Ferrite magnet’s high temperature resistance makes them suitable for long-term high-power operation. Although the sound quality is weak, they are highly stable. They are highly impact-resistant and applicable for frequent vibration environments in industrial or outdoor scenes.

5. Siren magnet‌

Ferrite magnets are suitable for siren speaker, which are resistant to high temperatures and low cost. The magnetic energy density is moderate, meeting the needs of high-frequency sharp sound waves. Long life, maintenance-free, suitable for security equipment

6. Mobile phone speaker magnet‌

NdFeB magnets from Mobile phone speaker are used to support micro-thin design and improve space utilization; they support high-frequency clarity and micro-diaphragm drive, and caters to smart device integration.

7.Golf Speaker Magnet
Neodymium magnets have become the preferred choice for magnetic golf speaker systems due to their ultra-high magnetic energy product and lightweight properties. The high remanence ensures stability in voice coil driving force, while the wide frequency range supports treble clarity and bass transient response, meeting the stringent audio quality requirements of golf scenarios.

How to Achieve Lightweight Design of NdFeB Magnets in a Speaker

    NdFeB speaker magnets only require 1/4 of the volume of ferrite to achieve the same magnetic force, directly compressing the thickness of the speaker unit to the millimeter level. Supporting space optimization technology, the magnets are integrated with the circuit board through special-shaped cutting or embedded PCB board design to reduce the stacking space occupied by the whole machine. Aluminum alloy or carbon fiber shell can be used, combined with the low density characteristics of NdFeB magnets , the weight of the whole machine can be controlled within 5g, and lightweight materials are matched. The most typical example is the use of neodymium magnets in headphones.

NdFeB magnets in Bluetooth headphones

BMAG, as a professional supplier of neodymium speaker magnets, leverages its profound technical expertise and ultimate pursuit of quality. We are dedicated to providing customers with magnet products exhibiting excellent performance and high consistency, complemented by comprehensive technical support and attentive service.

Q&A

Why do high-end audio systems prefer neodymium speaker magnets?

Ferrite magnets remain dominant in mid-to-low-end markets for their cost efficiency, while neodymium loud speaker magnets now power over 70% of Hi-Fi and professional-grade audio gear. Leading brands leverage neodymium technology as a premium differentiator.

In summary, neodymium speaker magnets enable high-end audio’s performance edge through superior magnetic strength, refined acoustics, and compact design, with engineered solutions effectively resolving cost and durability concerns.