dSONIQ is an audio software developer behind Realphones, a headphone monitoring plugin and standalone application that corrects the frequency response of over 200 popular headphone models and simulates the acoustics of professional studios, clubs, and cars for mixing and mastering. The company began research into headphone measurement technology in 2015 and operates as dSONIQ OÜ, registered in Tallinn, Estonia.

Realphones is available as a system-wide application and as VST, VST3, AU, and AAX plugins for macOS and Windows, with Professional and Ultimate editions that add custom calibration profiles, a wide catalog of acoustic environment simulations, and MIDI control. The software is aimed at engineers, producers, and composers who mix primarily on headphones and need a reference closer to treated-room monitoring.

dSONIQ has 2 products cataloged on Equipboard, including Mastering Plugins and Referencing Tools.