• Open-back dynamic reference headphones
• All-new 42 mm transducer and 38 mm diaphragm
• Aluminum voice coils for effortless detail and engaging dynamics
• Ventilated driver reduces turbulence for clarity across the entire frequency range
• Special damping element made from fine acoustic metal mesh
• Includes detachable ¼-inch (6.3mm) single-ended and 4.4mm balanced cables

• Lightweight, timeless design and comfortable velour pads for hours of fatigue-free listening
• Acoustic components manufactured and assembled to tightest tolerances for optimized performance
• Impedance: 150 ohms
• Frequency response: 9 – 41,500 Hz
• Total harmonic distortion: <0.04%

A Direct Connection To Your Music

Known for their engaging signatures and liquid-smooth response, HD 660S predecessors HD 650 and HD 600 shattered performance barriers in the audiophile headphone category. The HD 660S transcends the best of that storied DNA with supernatural speed and effortless instrument reproduction—even at the bookends of the frequency spectrum. Utilizing an all-new transducer and specially ventilated drive unit, the HD 660S delivers the revealing, tack-sharp detail audiophiles demand without sacrificing the engaging dynamics that make music so enjoyable.