These Studio Monitor Series headphones incorporate high-end materials and advanced engineering to produce critically clean, exceptionally clear sound for professional and high fidelity applications. Swivel earcups enable single-sided monitoring for DJ and remix applications. Listen to house sound with one ear while you cue up the next track with the other. An auto return swivel mechanism brings the earcups back to the standard listening position, giving you one less thing to worry about. The 50 mm diameter drive units deliver reference-grade sound and enable superior power handling with deeper bass, lower distortion and wider dynamic range. The frequency response extends down to an extraordinary 5 Hz. 3000 mW power handling means these headphones can handle the most stringent professional applications, standing up to day-in, day-out use at very high output levels.