Hefio is a R&D company specialized in headphone calibration technologies. Born in the world-renowned Aalto Acoustic Labs, we combine our deep knowledge in headphone acoustics, human hearing, and signal processing to develop comprehensive headphone calibration solutions; delivering greater accuracy, precision, and transparency on headphones for audio and music professionals than any other commercial solution available today. ------ We not only calibrate individual headphones; but also calibrate them on your ears, for your individual ear canal acoustics, in your studio, for every use, within seconds.