Featuring patented S-Logic Plus technology, the PRO 900i Closed-Back Professional Reference Headphones by Ultrasone are geared toward audio professionals who demand precise reference monitoring, whether in the studio or on location. The stiff and strong 40mm titanium-plated drivers provide high-fidelity sound throughout the audio spectrum, and are light enough to ensure ultrafast response time and accurate sound reproduction. The velvet earpads form a seal around the ears that prevents the sound from leaking out to sonically isolate the listener from their surroundings.

The S-Logic Plus technology is at the core of the listening experience offered by these headphones. It delivers a spacious and natural sound with a wide frequency range, and it generates lower sound-pressure level than traditional headphones while achieving the same perceived loudness. This can potentially reduce hearing damage and facilitate fatigue-free listening. Incorporating components developed for Ultrasone’s flagship Edition series, the acoustically redesigned earcups and their tonal fine-tuning aim to achieve a sound free of coloration, ideal for monitoring, engineering, and mastering.

Other features include ULE technology, which utilizes MU metal shielding to protect listeners from the potential effects of low-frequency radiation generated by headphone drivers. The headphones come with a detachable straight cable and a 1/4″ adapter. A hard-shell transport case and a second pair of earpads are also included.