USound headphones

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USound’s MEMS speakers extreme bandwidth technology

In this article, I want to focus on one particular feature that we haven’t discussed: our extreme bandwidth technology (XBW). 

We use our XBW (extreme bandwidth) technology to increase the range of sounds that the loudspeaker can reproduce. Our Ganymede MEMS speakers can play higher frequencies than conventional loudspeakers and produces higher SPL at ultra-high frequencies above 20 kHz. This makes it the perfect component for Hi-Res audio applications.

How did we achieve that?


We achieve this extreme bandwidth through various technologies, the most important being our MEMS motor, designed to generate additional force at high frequencies. The MEMS motor’s highly precise movement allows for accurate reproduction, especially at high and ultra-high frequencies, which reduces audible distortion.

The lack of a heavy and unstable coil means that we can work with a much lower total moving mass. This is helped by using a multi-layer composite material for the diaphragm, which is very thin and lightweight but at the same time also very stiff. It ensures a precise, piston-like movement even at ultra-high frequencies. This allows us to play sound accurately in the Hi-Res audio up to 40 kHz and higher.

Why do we want to do that?

Sounds in nature and music, such as in a live orchestra, contain very high frequencies, including ultrasound. While we can’t directly hear frequencies that high, they can influence how we perceive music. For this to be possible, you need a loudspeaker capable of reproducing ultra-high frequencies, and our MEMS speaker Achelous UT-P2018 – from the Ganymede series – designed for in-ear applications, can do just that. Due to our XBW technology, we can build our micro speakers to sound more accurate, improving the user experience.

When measuring our Achelous MEMS speaker, you can see an extended upper harmonic reproduction at around 10 kHz, which is a direct result of our XBW technology, enabling the loudspeaker to produce higher SPL at 20 to 80 kHz to achieve Hi-Res audio. 

When using the MEMS loudspeaker in an application, such as earbuds or TWS, these harmonics at 10 kHz cannot be seen anymore. The final product meets the High-res audio criteria due to its extended bandwidth and excellent high-frequency reproduction. This allows you to listen to music just as if you were there, live at the concert. And that, after all, is everything a music lover can ask for.

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Konstantin Davy

About the author

USound’s headphone and earphone expert, Konstantin Davy is a music enthusiast, with a background in both acoustics engineering and audio engineering. He has been with USound since 2015.