Sennheiser HiRes Audiophile Headphone (HD 660 S)

• Reference-class open-back, dynamic headphone employing new and improved transducers delivering low harmonic distortion
• Transducers are hand-selected for precise ( 1 dB) left / right matching tolerance insure exceptional accuracy and presentation of stereo spatial characteristics
• 150-ohm nominal impedance allows direct connection to home and mobile Hires audio devices
• Para-aramid reinforced, detachable cables employ high conductivity OFC copper to insure signal integrity with very low handling noise
• Supplied with two connection cables: One with a 6.35 mm stereo plug, the other a 4.4 mm Pentaconn balanced stereo plug. Also included is a 6.35 mm to 3.5 mm adaptor.

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