Reference-grade sealed balanced headphones ready for your balanced-drive headphone amplifier, the Ultrasone PRO 900 Balanced are the first consumer headphones to come direct from the manufacturer in balanced format. Featuring stereo XLR connectors for use with a dedicated balanced headphone amp, the sound becomes impossibly open and 'speaker-like' with uber-fast dynamic range reach, fully detailed accuracy and soaring frequency range extension. Partner with our HeadRoom BUDA amp for scintillating acoustic results!