Beyerdynamic DT 770 Premium 600 OHM Headphones (Discontinued by Manufacturer) Stereo Headphone 600 ohm for high power requirements, headphone amps, home audio applications, analytical, true and accurate sound reproduction 32 Ohm version; Innovative "Bass reflex" system for excellent audio performance Excellent ambient noise attenuation for no disturbances Closed, dynamic headset, Frequency response of 5 - 35,000 Hz Single-sided cable with gold vaporized stereo mini jack & 1/4" adapter