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Sennheiser HD660s Open Box

Customer exchange, great condition. Boxed, Full warranty.

Sennheiser HD660s is a new improved headphone, based on the good but aging HD650 (and hd580/600). The HD660s is easier to drive, better matching the more portable sources we are all using nowadays, with both a slightly higher sensitivity and a much lower impedance of 150 ohms. Sound quality is more open with better clarity and a really clean, smooth midrange. 

HD660s are still light weight, at 260g, with deep velour pads for great comfort. There are now two cables included - one with 6.5mm plug & a 3.5mm adaptor. The second a new style 4.4mm balanced pentaconn connector that is showing up on plenty of portable and desktop amps this in 2019.

  • Impedance: 150 ohm
  • Sensitivity: 104dB
  • Frequency Response: 10 - 41,000 Hz
  • THD: 0.04%
  • warranty: 2 years
  • 6.5mm plug cable and 4.4mm plug cables included
  • 6.5mm - 3.5mm adaptor included
  • 2 years warranty


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5.0 Based on 1 Reviews
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Another try with Sennheiser

I am really enjoying these headphones. These are my fifth set of Senns (had HD58X's, HD600's, HD598c's and HD6XX's). I think these are the set that I will be keeping long term. More of a minimalist sound compared to my other 'phones. Great addition to the collection.

Shane D.
Canada Canada