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Sennheiser HD 660 S Headphone Review

Rating: 9.0.

In the audio community, the Sennheiser HD 650 is something of a legend – an excellent value headphone, it delivers exceptional audio quality without costing the earth. It is perhaps a bold move, then, for Sennheiser to release a successor to the much-loved HD 650, named the HD 660 S. With a price of £429, is this the new go-to headphone for budget audiophiles?

Instead of just re-tuning the HD 650 driver, the Sennheiser HD 660 S actually features an all-new transducer design and a lower impedance of just 150Ω. That means the HD 660 S is considerably easier to drive than its predecessor, giving it some extra versatility in that it can be easily used with portable music players. It’s still an open-back headphone, though, so not for use out and about, but it will sound better across a wider range of devices.


  • 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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