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sennheiser hd660s
sennheiser hd660s

Sennheiser HD 660S


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The perfect blend of power and control, the HD 660S is a powerhouse open-back headphone with the versatility to connect you to the deepest corners of your music collection.

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Sennheiser HD 660S: A Direct Connection To Your Music

Known for their engaging signatures and liquid-smooth response, Sennheiser shattered performance barriers in the audiophile headphone category with HD 660S predecessors HD 650 and HD 600. The HD 660S transcends the best of that storied DNA with supernatural speed and effortless instrument reproduction—even at the bookends of the frequency spectrum. Utilizing an all-new transducer and specially ventilated drive unit, the Sennheiser HD 660S delivers the revealing, tack-sharp detail audiophiles demand without sacrificing the engaging dynamics that make music so enjoyable.


From Our Ears To Yours

In just one listen you will understand why the HD 660S is so special. Thousands of listening sessions later its purpose is even clearer. What you hear each and every time is the result of an open-back earcup mated to a new transducer tuned for the modern audiophile. Its speedy response is perfectly suited for reproducing those frequency-stretching recordings with confidence. Thanks to an aluminum voice coil, the 38mm diaphragm remains nimble for ultra-quick impulse fidelity across the board. This activation and rest behavior unlocks the capability to communicate tonal and spatial characteristics precisely.

Meshing Together

The steel mesh found on the Sennheiser HD660S drive unit is interesting in design but most impressive when it comes to performance. It completes the ventilated driver, offering consistent control of air displacement to reduce turbulence. As a result, diaphragm travel is pure, letting the music—and only the music—shine in a perfect balance of integrity and expression. The steel composition allows for much tighter production tolerances, ultimately contributing to remarkably consistent characteristics of each HD 660S produced. When combined with the open-back earcups, the sound emanating from each transducer is completely free to expand, just as it would in nature.

Capability, Meet Versatility.

We optimized the Sennheiser HD 660S for efficiency on a wider range of devices to accommodate the varying levels of power present in output amplification circuitry.Today’s audiophile has more component choices than ever. We optimized the Sennheiser HD 660S for efficiency on a wider range of devices to accommodate the varying levels of power present in output amplification circuitry. At 150 ohms, the HD 660S is the perfect partner for dedicated amplifiers, A/V receivers, and digital audio players (DAPs)—the magnet is more powerful than its predecessors, and thus easier to drive regardless of how your setup changes over time.



Handled With Care

Every HD 660S we produce has experienced a matching regimen to mate each transducer from our Ireland manufacturing facility to its opposite-channel counterpart. These tolerances are extremely narrow and when bolstered by automated assembly processes, ensure that your HD 660S experience is consistent with those all over the globe. We designed it with thoughtful, lightweight materials invisible to the acoustical system without sacrificing the durability needed for daily, all-day use. With a never-ending supply of music to consume, we wanted every touch point to be soft, luxurious, and durable for those extended listening sessions.

It’s All About Connection

We packed your Sennheiser HD 660S with a versatile set of essential cables, each one impedance-matched with ultra-low capacitance.We packed your Sennheiser HD 660S with a versatile set of essential cables, each one impedance-matched with ultra-low capacitance. The ¼-inch / 6.3mm stereo connector offers the audiophile-standard plug for connection to devices such as headphone amplifiers and A/V receivers, digital audio players, analog gear, and more. A balanced, 4.4mm connector opens a pathway to a newer generation of balanced output devices (headphone amplifiers, digital audio players, etc.) that embrace this compact plug’s superior stability over time. A balanced headphone setup offers an even lower noise floor with great dynamic range when connected to balanced source/amp circuit outputs. The listener will thus experience a wider soundstage, tightly controlled transients and impossibly-clear instrument separation. Each cable is 9.8 feet / 3m long to accommodate unencumbered listening on gear deep within your shelves, or favorite listening chair, and a flexible adapter is included to reduce the 6.3mm to 3.5mm. An optional balanced cable (CH 650 S) is sold separately for simplified connection to 4-pin XLR jacks.




  • Open-back dynamic reference headphones
  • All-new 42 mm transducer and 38 mm diaphragm
  • Aluminum voice coils for effortless detail and engaging dynamics
  • Ventilated driver reduces turbulence for clarity across the entire frequency range
  • Special damping element made from fine acoustic metal mesh
  • Includes detachable ¼-inch (6.3mm) single-ended and 4.4mm balanced cables
  • Lightweight, timeless design and comfortable velour pads for hours of fatigue-free listening
  • Acoustic components manufactured and assembled to tightest tolerances for optimized performance
  • Impedance: 150 ohms
  • Frequency response: 9 – 41,500 Hz
  • Total harmonic distortion: <0.04%

Technical Data

  • Wearing style
  • Color
    matte black
  • Frequency response (Headphones)
    9 – 41,500 Hz
    • Sound pressure level (SPL)
      104 dB
    • THD, total harmonic distortion
      < 0,04%
    • Contact pressure
      6.0 N ± 1 N
    • Ear coupling
    • Connector
      6.35 mm / 4.4 mm Pentaconn
    • Cable length
      3 m
    • Transducer principle
      Dynamic, open
    • Nominal impedance
      150 Ω
    • Weight w/o cable
      260 g




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