Headphone Over Ear Sennheiser HD 660 S Open Back


Sennheiser’s new HD 660 S is the ideal open, dynamic headphone for the passionate audiophile.


A new audiophile versatility

The new HD 660 S lets you enjoy sophisticated audiophile sound in even more listening situations. The successor of the legendary HD 650 excels with the improved performance of its new transducer design. Thanks to its lower impedance, it delivers reference-class sound also when connected to hi-res mobile players, thus offering much greater versatility. The HD 660 S is an elegantly designed piece of high-quality engineering that indulges the demanding listener with aural precision and great wearing comfort

The look of sophistication

The pure and effortless sound of the HD 660 S is reflected in its new matte black and anthracite design. It is a high-end aesthetic that embraces both timeless elegance and contemporary style – uncompromising in its craftsmanship, like everything about the HD 660 S.

Sound for the passionate music enthusiast

Made for the demanding listener, the HD 660 S surpasses the exceptional performance of its predecessor, the legendary HD 650. With a crisp bass, excellent mid-frequency response, and a gentle, pleasantly natural treble, the HD 660 S has an expressiveness that immerses you in every emotion and nuance of music. Still, it always stays exceptionally accurate and transparent.

Technical Data

  • Impedance
    150 Ω
  • Connector
    6.35 mm / 4.4 mm Pentaconn
  • Frequency response
    10 – 41,000 Hz (-10 dB)
    • Sound pressure level (SPL)
      104 dB at 1V 1kHz
    • Ear coupling
      Over-ear (circumaural)
    • THD + N, total harmonic distortion and noise
      < 0,04% (1 kHz, 100 dB)
    • Transducer principle (headphones)
      Dynamic, open
    • Weight w/o cable
      Approx. 260 g (without cable)


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