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Know Your Sound Tool: Beryllium Drivers

In our new series featuring the design and technical aspects of our bluetooth earbuds, headphones, and speaker, we speak with members of our product team to learn more about what goes into the engineering of our premium audio products.

Today we talk about a new material used in our latest wireless sound tools including MW08 Active Noise-Cancelling True Wireless Earphones, MW65 Active Noise-Cancelling Wireless Over-Ear Headphones, the MW07 True Wireless Earphones and the MW50+ 2-in-1 Wireless Headphones. Both these earphones and noise-isolating and noise-cancelling headphones are the first we created that use beryllium drivers.

So why beryllium?

“When designing the transducers that play a pivotal role in our headphones and earphones, we want the right combination of weight and stiffness/rigidity”, Thomas Wilson, Director of Product Design, explains. “Headphones and earphones with a light but stiff diaphragm allow you to reproduce sound more accurately. Essentially, you want it to act like a piston. If it’s not stiff enough, it’s going to flex and distort—and that translates to distortions in sound. And if it’s not light enough, it’s going to have a hard time moving back and forth fast enough to produce the frequencies that we want our headphones and earphones to produce.”

Our custom 40mm beryllium drivers
MW07 True Wireless Earphones

“So the ideal material you use is something that is very light, but also exceptionally rigid. Beryllium checks both those boxes beautifully. It has one of the highest strength-to-weight ratios of all materials.”

So why doesn’t everyone use beryllium?

One big reason: it’s expensive. But here at Master & Dynamic, we like to use the best. And beryllium is pretty much the best, second only to diamonds. (We’re not coming out with diamond headphones anytime soon, because it’s too brittle as a material—not to mention a little too rich for our blood.)

MW50+ 2-in-1 Wireless Headphones
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