Hefio ONE - Hefio


Self-calibrating professional headphones

The Hefio One headphones give you the perfect sound reproduction that adjusts the frequency response to user’s individual ear with our own calibration algorithm. The headphone design combines separate tweeter and woofer elements with gentle ear insertion that produce the full spectrum with comfort and quality.


Hefio headphones sound great even without self-calibration and they work without any additional software. Personalization requires Hefio software, which is free for Hefio headphones owners.

Hefio Calibrator

Personalization is carried out by using a mobile application, which runs on iOS, Android and Windows Phone devices. The result of the analysis parametrizes our high quality EQ algorithms, which optimize the listening experience for each individual user.

Hefio Player

In addition to Calibrator functionality, Hefio Player supports content streaming from Spotify, device media and online radio stations. These streams are processed with our EQ algorithm for optimal sound quality through the calibrated Hefio headphones. Two EQ target selections allow flat and natural audio enhancement profiles.

Hefio PersonalEQ

Hefio PersonalEQ is an application, which runs on OSX and Windows platforms, and enhances the output of any application that sends its audio to the default audio output of the device. These include – but are not limited to – media players, audio and video streaming service clients, web browsers and games. The users may further configure PersonalEQ according to their taste: flat and natural audio enhancement profiles and an additional 31-band user EQ enable further customization. Premium users may even choose between biquad and convolution based EQ implementations.

Technical details


Dual Dynamic Driver (Tweeter + Woofer)


40 Ω


20 – 20000 Hz


3.5 mm TRRS, gold plated