Sennheiser HD 660 S Audiophile Headphones

Product SKU: 508826


Regular price $499.95 Sale Save $-499.95 (Liquid error (sections/product-template.liquid line 196): divided by 0% OFF)

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Sennheiser HD 660 S Audiophile Headphones

Sennheiser’s new HD 660 S is the ideal open, dynamic headphone for the passionate audiophile. Meticulously crafted for most demanding listener, the HD 660 S builds on the legacy of the legendary HD 650, surpassing the exceptional performance of its predecessor with a new and improved transducer design that delivers lower harmonic distortion for an even more natural, lifelike audio experience. It is exceptionally accurate
and transparent, yet has an expressiveness that immerses you in every emotion and nuance of music. With a lower impedance of 150 ohms, and a wider choice of cables that includes both balanced (4.4 mm Pentaconn) and 6.35 mm connectors, the HD 660 S offers the versatility to enjoy reference class high fidelity sound with stationary and mobile players alike.

  • Reference class open dynamic wired headphones
  • New improved transducer design for very low harmonic distortion
  • Hand-selected headphone drivers with precise left and right matching tolerances (± 1 dB) for accuracy
  • 150 ohms nominal impedance to allow direct connection to both stationary and mobile HiRes Players
  • Detachable cables made from highly conductive OFC copper, with very low handling noise and para-aramid reinforced
  • Includes a choice of connection cables with either 6.35 mm stereo plug or a 4.4 mm Pentaconn balanced stereo plug. A 6.35 mm to 3.5 mm adapter is also included
  • Frequency Response: 10 Hz – 41.000 Hz
  • Sound Pressure Level at 1 kHz, 1 Vrms: 104 dB
  • THD at 1 kHz, 100 dB: ? 0,04 %
  • Supplied with storage box
  • 2-year warranty


Transducer principle: Dynamic open
Frequency response: 10 – 41,000 Hz (-10 dB)
Frequency response: Diffuse-field equalized
Sound pressure level (SPL): 104 dB at 1V 1kHz
Impedance: 150 ?
THD+N: < 0,04% (1 kHz, 100 dB)
Ear coupling: Over-ear (circumaural)
Connector: Stereo jack plug, gold-plated
6.35 mm: unbalanced, 3-pin
4.4 mm: balanced, 5-pin
Adapter: 6.35 mm to 3.5 mm
Weight: Approx. 9.17 oz. (260 g) without cable

Product Reviews

Sennheiser HD 660 S Audiophile Headphones

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5.0 Based on 5 Reviews
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Joe P.
United States United States
Great headphones!

Fantastic sounding headphones! Amazing clarity and localization of sounds. Audio 46 has great prices and fast shipping! A very happy customer!

Trevor R.
United States United States

My first audiophile head-phones and I’m hearing stuff in my favorite songs that I’ve never heard before!

Connor W.
United States United States
HD660S Headphones

Best sounding headphones I’ve ever used. Get a high quality DAC amplifier to go with them if you plug into your phone.

Joseph M.
United States United States

They sound great!...even hooked up to the computer! I was waiting to do this review because I was waiting for a Topping DX7 Pro DAC/headphone amp to arrive. Just was delivered last night. Hooked it up to my computer via USB and all I've got to say is...I like this! The headphones sound so clean and they are so's a beautiful thing! I'm so happy that I purchased this pair of headphones. Thank you very much to the people at audio46 for making this happen for me...and very quickly too, I might add! I wouldn't hesitate to purchase future products from your business.

Stephen M.
United States United States
Sennheiser HD 660S Headphones

Excellent choice of headphone for my home studio. Sennheiser's latest addition to the legendary 600 series line is definitely in keeping with their high quality products. Very happy with my purchase and the $100 price drop mad these an easy decision.


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