Why Magnets Make Sound

Speakers use magnets to generate sound. Speakers make noise. Little speakers make little noises. Big speakers make big noises. But how? It’s all about magnets! A magnet is something that can pull or push metal.

Speakers use magnets to generate sound. Your speaker magnets are made in a Neodymium Magnet Factory. Inside a speaker, there’s a magnet and a coil of wire. This is what makes the sound, the magnetic flux density. When electricity goes through the wire, it makes the wire move. The magnet helps push and pull that wire.

This moving wire makes air move. Moving air makes sound! It’s like magic, but it’s science! It’s all thanks to something called “Faraday’s Law”. Faraday’s Law explains how electromagnetic induction moves the diaphragm up and down.

Stronger magnets make the wire move more. More movement means louder sound. Clearer movement means better sound. We, at the NdFeB Magnets Factory, make very strong magnets!

The Old Days: Big, Heavy Magnets

Long ago, speakers used different kinds of magnets. They worked, but they weren’t perfect.

• Alnico Magnets: These were used in the 1940s to the 1970s. They were the first magnets created using Alnico alloys. They were pretty strong, but they were also big and heavy. Think of an old, really big radio! They had a magnetic flux density of about 1.3T
• Ferrite Magnets: These came next, from the 1970s to the 1990s. People also call them ceramic magnets. They were cheaper, but not as strong. They did not have higher coercivity. Because these were cheaper and not as strong, the speakers were low quality.

The problem with these old magnets? They were not very efficient, or able to work well the way they were supposed to. They got hot, and they were heavy, so small speakers with good sound were hard to make.

The properties of old magnets include paramagentic materials, permeability factors, and magnetic circuit design.

The NdFeB Wow! Small Magnets, Big Sound!

Then, something amazing happened! People figured out how to make neodymium magnets, also called NdFeB magnets! These magnets changed everything! We make these magnets custom made here at Customized NdFeB Magnets! They were first used in the 1980s, and are still used today!.

Why are NdFeB Magnets So Good?

They come in all different magnet grades.

• Super Strong: They are about 10 times stronger than the old ferrite magnets! This means louder sound from even small speakers.
• Tiny Size: Because they are so strong, we can make them much smaller. This means we can make small speakers that still sound great!
• Work Well: They don’t lose their magnetism easily. Even when it does get hot, we use heat dissipation! This is very important for high-efficiency drivers. They are known for resistence to demagnetization.

These changes were known as “neodymium breakthroughs.”

NdFeB magnets power the best headphones, speakers in your phone, and big speakers at concerts! They are important to high-res audio. They are key for clear, crisp sound. We use magnetic shielding to do this. These speakers use multi-layer coils for the most sound.

Our NdFeB magnets are made just right to make the sound perfect. We use composite magnet structures to do this. We control the magnetic flux and make sure there’s no distortion. These magnets adhere to Hi-Res Audio standards. Our magnets are the best for people who love music! You can check out our product details here.

We follow important rules. The IEC 60404-8 standards help us with magnetic hysteresis. We also make magnetic modules to adhere.

How to Pick the Right Magnet

If you’re making a speaker, you need to pick the right magnet.

Here are some of the properties of our magnets:

• Flux Modulation
• Pole piece materials
• Adhesive bonding methods

Here are the most important things to think about:

1. Magnetic Field Strength: How strong is the magnet? We measure this in something called “Gauss” or “Tesla”. More Gauss means a stronger magnet.
2. Temperature: Magnets can get hot. If they get too hot, they can stop being magnetic! We have magnets that can handle lots of heat! We have engineered magnet geometry to help.
3. Keep it Safe from Rust: Magnets get demagnetized when they get edgy current. Water can make some magnets rust. We put a special coat on our magnets to stop the rust! This is a Ni-Cu-Ni coating. This stands for nickel, copper, nickel.
4. Shape and Size: Speakers need different shapes of magnets. We can make any shape you need! Pole pieces and arcs, no problem!
5. Follow the Rules: There are rules for making good, safe magnets. We follow all the rules! It is important that the permanent magnet materials are top quality.

Making Magnets Better and Better

We keep working to make our NdFeB magnets even better! Our magnets use Faraday’s law applications and electromagnetic induction, which reduces magnetorestriction!

Here are some things we think about:

• Stop the Heat: Even strong NdFeB magnets, like N52, can have trouble when they get very hot. Learn more about magnet grades. We use special ways to make sure our magnets stay strong even when they get hot. Sintered NdFeB magnets help with this.
• Price and Quality: Good things cost money. But NdFeB magnets last a long time. They are a good deal because you don’t have to buy new ones often, compared to ferrite magnets. There is good weight-to-power ratios to consider as well.
• Keep our earth healthy: We care about the planet. So, it is important to consider where we got our rare earth-elements that are used in our magnets. We use recycled materials to make our magnets. This helps keep the Earth clean and healthy!

Other challenges include minimizing core saturation and reducing edgy current.

Questions You Might Have