Sennheiser HD 660S2 Open Over-Ear Headphones with Optimized Surround & Improved Transducer Airflow

$589.95 OR

Regular Price: $599.95

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Model: 700240 UPC: 810091270370 Item: 179283

Product Information

Dive deeper into your music

Enjoy your music on a completely new level. An intimate, relaxed sound signature combines with outstanding precision and exceptional comfort — and now, extended sub-bass — for a deeply moving experience. The extremely precise yet non-fatiguing sound of the HD 660S2 delivers even more impact with extended sub-bass. With an optimized surround, transducer airflow, and coil Sennheiser's engineers doubled the sound pressure at the lowest octaves. You can feel the lowest note on the piano (27.5 Hz) or the kick of the bass drum (45 60 Hz) as if you were there. The relaxed tone and open-back design make these extremely comfortable headphones great for long sessions. With warm tuning, smooth treble, and strong bass, the standard setter for extended listening is now the standard setter extended bass as well.


  • 38mm high-performance transducers built in Ireland
  • Natural, relaxed, high-fidelity sound with extra sub-bass
  • Uniquely powerful vented magnet system for minimized distortion
  • Ultra-light aluminum voice coil with 300-ohm impedance for excellent impulse response
  • Intimate sound with great timbre and deep, accurate sub-bass
  • Exceptional comfort and build quality
  • Global 2-year warranty offers peace of mind for your audio equipment investment

Audiophile Sound

This warm, inviting signature combined with extended sub-bass makes listening uniquely pleasant and rewarding. And with comfort this good, it practically begs you to keep going for endless sessions. That’s how HD 660S2 combines the best of many worlds to give you an intimate experience you won’t want to live without.

Exceptional Comfort

The low total weight and ergonomic headband rule out any potential discomfort on top of your head as well. Combined with excellent build quality made in Ireland, you’ll quickly grow attached to a listening experience that’s as physically pleasing as the warm, non-fatiguing sound at its heart.



  • Transducer principle: Dynamic, open
  • Transducer size: 38 mm
  • Frequency response: 8 Hz - 41,500 Hz
  • Impedance: 300 Ω
  • Sound Pressure Level (SPL): 104 dB (1 V)
  • Total Harmonic Distortion (THD): < 0.04% (1 kHz, 100dB)
  • Style: Over-ear
  • Weight: 0.57 lbs (260g)
  • Adapter: 6.3 mm (1⁄4 inch) to 3.5 mm
  • Connector: 6.3 mm (1⁄4 inch) jack plug, 4.4 mm balanced plug
  • Cable length: 1.8 m (5.9 ft)
  • Country of origin: Ireland
  • Magnetic field: 2.5 mT

What's in the Box

What’s in the Box

  • HD 660S2 Open Over-Ear Headphones with Optimized Surround & Improved Transducer Airflow
  • 6.3 mm cable (5.9 ft)
  • 4.4 mm cable (5.9ft)
  • 6.3 mm to 3.5 mm adapter
  • Carry pouch


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