Sennheiser’s new HD 660S is the ideal open, dynamic headphone for the passionate audiophile. Meticulously crafted from hand selected components and specially developed acoustic materials, it delivers incredibly low harmonic distortion for an exceptionally natural, lifelike audio experience. With a lower impedance of 150 ohms, the HD 660 S offers the versatility to enjoy reference class high fidelity sound with stationary and mobile players alike.

Wearing style	Headband
Color	matte black
Frequency response (Headphones)	9 – 41,500 Hz
Sound pressure level (SPL)	104 dB
THD, total harmonic distortion	< 0,04%
Contact pressure	6.0 N ± 1 N
Ear coupling	circumaural
Connector	6.35 mm / 4.4 mm Pentaconn
Cable length	3 m
Transducer principle	Dynamic, open
Nominal impedance	150 Ω
Weight w/o cable	260 g