Conclusions
The Ultrasone Pro 900 is an excellent choice of closed-back headphone. Its exceptional high-frequency extension can exploit the ability of high-resolution recordings to deliver harmonic textures. Its rendering of fine detail is not quite up to the level of Ultrasone’s own Edition 8, but it comes remarkably close for 60% less money. My only reservations have to do with the Pro 900’s bass performance, which did not fit my priorities, and its effect on the lower midrange. If you crave a little extra bass in your headphone listening, and are willing to sacrifice a little agility that is inevitably required to get it, then the Pro 900 may be your ideal choice. For me, the Pro 900 brought out the technical aspects of listening to recordings while never sacrificing the music, and was a whole lot of fun to boot.