Fostex T40RPMK2 Closed Dynamic Studio Headphones for DJ and Sound Engineer Applications Closed-style dynamic headphones with 15 Hz-30 kHz frequency response and patented RP technology Max Input 2000 MW ; impedance 50 ohm Compatible with all analog and digital formats Features single entry locking cord, padded ear cushions, and wide self-adjusting headband Includes one 1/4" jack