Sound is all that matters.

No matter how we monitor the sound, the goal is always the same: obtaining the sound in its most immaculate form, in its fullness. We believe your headphones should be no exception to that. With that belief in mind, we started our journey to optimize your headphones to deliver the most truthful and reliable sound reproduction. After all; isn’t it the sound all that matters?


We build the future of headphone monitoring.


We are a team of world-class experts in headphone acoustics, human hearing and signal processing united with a common passion for sound and music. And we want to pay our gratitude to the creators behind by providing them the most reliable -and we mean the most reliable- reproduction of their work on headphones.

Therefore; we combine our deep scientific knowledge to achieve new heights in headphone sound optimization technologies, developing unique solutions to the problems which have been industry roadblocks in achieving true sound on headphones for decades.


HEFIO - Headphone Fidelity Optimized

Headphone acoustics are far more complex than loudspeakers. First; their response, and so the tonal accuracy in monitoring differs drastically even between different pairs of the same model; and even more, between two listeners using the same pair. Second, achieving spatial accuracy is impossible without correct calibration technique. Headphones -as they are now, are unreliable for professional monitoring and critical listening. We are here to change that.

At Hefio, we develop leading-edge headphone calibration and digital sound optimization solutions for unrivaled reliability and transparency in headphone monitoring to deliver you perfect tonal and spatial translation in headphone mixing and mastering. With us, you can have the reliability of professional studio monitors on your headphones.

As we have mentioned, we do things in unique ways. It is not just mere words. The accuracy and precision of our calibration and optimization solutions come from the ability to estimate the headphone frequency response at the eardrum of the listener -which has so far been a central, unsolved problem in the industry. Based on years of extensive scientific research and in-house built know-how, we have cracked this major problem to deliver you the tonal and spatial accuracy you need on your monitoring headphones.

Through our core technology, we can directly analyze and optimize the headphone sound at its ultimate destination -your eardrum for both tonal and spatial accuracy; delivering you the most truthful, transparent, and reliable headphone sound reproduction.

Our Partners

We are the frontiers in what we do, so are our partners.



We think there is not much to say about Genelec as the name stands by itself; the ultimate frontier in professional monitoring solutions.

IDA Audio


IDA Audio is a frontier in developing commercial technologies that provide user-tailored head-related transfer functions (HRTFs) on headphones to achieve ultimate spatial resolution on headphones.


During our journey Business Finland has been one of our key supporters by funding us for CRESCENDO, a R&D project that enabled us to extend the scope of our research.