Neodymium vs Ferrite Magnets: What They Do for Sound

What a magnet does in a headphone driver

Inside a headphone driver, a magnet sits near a voice coil attached to a diaphragm. When an electrical signal from your device flows through the voice coil, the coil becomes an electromagnet. The push and pull between the coil's field and the permanent magnet's field moves the diaphragm, and that movement creates the pressure waves you hear as sound.

The magnet is one part of the driver's motor assembly. Its size, shape, and material shape the driver's design. Some listings put the magnet type in the title, usually as a single word such as "neodymium." Other listings leave it out, and the maker's page may or may not state it. For the wider picture of driver parts, read driver size and type.

Neodymium on a listing

Neodymium is a rare-earth element. A neodymium magnet is a permanent magnet that is strong relative to its own size and weight. That strength for size is the reason the word appears on headphone listings: it tells you the driver uses a compact, strong magnet, which can let the maker use a smaller driver assembly.

One maker page that names it is Apple's page for AirPods Max 2. It describes a "dual-neodymium ring magnet motor" in the driver and states that the design minimizes total harmonic distortion across the entire audible range. That sentence is an example of how a maker page can describe its magnet design in stated terms, without turning the magnet type into a sound claim.

When you see "neodymium" in a listing's title or bullet list, treat it as a stated detail about the driver's magnet. It does not tell you how loud, how detailed, or how warm the pair sounds. For the difference between driver families, see dynamic vs planar magnetic drivers.

Ferrite on a listing

Ferrite magnets, also called ceramic magnets, are made from iron oxide mixed with other materials. They have been common in loudspeakers for many years because they hold their magnetism well and are inexpensive to produce in large sizes.

A ferrite magnet is heavier than a neodymium magnet of similar magnetic strength. That is why ferrite appears more often in larger speakers than in small headphone drivers. On a headphone listing, the word "ferrite" tells you the driver uses this ceramic magnet type.

The word "ferrite" appears less often on current headphone listings than "neodymium." If a listing does not name the magnet at all, you do not know which type the driver uses unless the maker's page states it.

Efficiency, weight, and magnetic flux density

Three terms come up when people talk about driver magnets: efficiency, weight, and magnetic flux density. All three are design properties, and none of them is a sound-quality claim you can infer from a listing alone.

Magnetic flux density describes how concentrated the magnetic field is in the gap where the voice coil moves. In plain words, a denser field gives the motor more force to move the diaphragm. Some maker pages print a flux density figure; when a page does not, you have no stated number to compare.

Efficiency, or sensitivity, describes how much output a driver produces from a given electrical input. A strong magnet can contribute to an efficient motor, but the diaphragm, the voice coil, and the acoustic chamber all matter as much. The catalog does not print efficiency figures, so the guides do not compare them.

Weight is the easiest of the three to see. Neodymium's strength for its size lets a maker use a smaller magnet, which can reduce the driver's weight. Ferrite, being heavier for similar strength, tends to appear in larger magnet assemblies. The total weight of a headphone still depends on the frame, earcups, cushions, and electronics, so a neodymium driver alone does not make a pair light.

• Magnetic flux density: how concentrated the field is in the voice coil gap.
• Efficiency: how much output a driver produces from a given input.
• Weight: the magnet's share of the headphone's total mass.

What to read on the maker's page

When a listing names the magnet type, the maker's page often gives the fuller driver description. Look for a "driver" or "tech" section and read the exact wording. A maker may say "neodymium driver" or describe the magnet's shape, such as a ring magnet.

If the listing leaves the magnet out, the maker's page may still state it. If neither the listing nor the maker page names the magnet type, treat it as an unstated detail. For more on what magnet words do and do not tell you, see magnet type strength.

The stated details that the site's guides compare are the ones printed on the title and the maker's page: fit, connection, active noise cancelling, battery figures, Hi-Res or codec words, and earcup back. Magnet type is one more detail when a title prints it.

How to choose with the stated details

For most buyers, magnet type is a supporting detail rather than the deciding one. Your listening question usually comes down to fit, connection, noise cancelling, and battery.

Start with the form: choose over-ear if you want full earcups, or on-ear for a smaller profile. Then decide between wired and wireless, and check whether active noise cancelling is named on the title.

If you are comparing two pairs with identical stated details and one names neodymium while the other says nothing, you have learned one extra fact about the neodymium pair's driver. That fact is useful, but it is not a sound comparison.

Browse the full headphone guide to shortlist by the details that matter for your situation.

What to pick for your situation

Questions

Is a neodymium magnet better than a ferrite magnet in headphones?

Better is a judgment, and this site has no data for it. Neodymium is strong for its size, which is why many headphone makers name it on their listings. Ferrite is heavier but has been used in loudspeakers for many years. The word on a listing tells you the magnet type, not how a pair sounds.

What does magnetic flux density mean on a maker's page?

It is the measure of how concentrated the magnetic field is in the driver's gap where the voice coil moves. A page may print a flux density figure. If it does not, you cannot compare it between pairs, because the guides only work with stated details.

Do neodymium headphones weigh less?

Neodymium's strength for its size can allow a smaller magnet, and a smaller magnet can reduce driver weight. Total headphone weight comes from the whole design: frame, earcups, cushions, and electronics. The catalog does not have a weight figure to compare.

Why do some headphone listings not name a magnet type?

The magnet is one part of the driver design. Many listings print only the selling points, and the maker's page may state the magnet type or leave it out. An unstated detail is simply unstated.

Can I use the magnet type to compare two pairs?

You can compare the words on the listings and read what the maker pages state. Magnet type alone does not tell you which pair fits better, lasts longer, or suits your listening situation. Compare fit, connection, active noise cancelling, and battery figures first.