Sony MDR-Z700DJ Headphones Reversible swivel earcups for DJ and remix single-sided monitoring, and an auto return swivel mechanism Supra-aural design ensures excellent comfort and creates controlled environment for better sound Huge, 50 mm drivers deliver deep bass down to 5 hz and provide outstanding dynamic range 3,000 mW power handling for the most stringent professional applications and daily use at very high output levels Frequency response: 5 to 30,000 Hz