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Sennheiser Open-Back Dynamic Headphones,HD 660 S

SKU: 508826 Brand:

41,390 incl. GST

6,314 GST Input (18%) Claimable with B2B Billing.
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5 in stock

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  • Reference-Class, Dynamic Wired Headphones
  • For Stationary & Mobile High-Res Players
  • Very Low Harmonic Distortion
  • Tolerances for ±1 dB Accuracy
  • 10 Hz to 41 kHz Frequency Response
  • Detachable Para-Aramid Cables
  • Includes 1/4″ to 1/8″ Adapter Plug
  • 1/4″ Stereo & 4.4mm Pentaconn Cables
  • Includes Storage Box
In the Box:
  • Sennheiser HD 660 S Open-Back Dynamic Headphones
  • Cable with 1/4″ (6.35 mm) Plug
  • Cable with 0.17″ (4.4 mm) Pentaconn Plug, Balanced
  • 1/4″ to 1/8″ Adapter
  • Storage Box

Sennheiser HD 660 S

The HD 660 S Open-Back Dynamic Headphones from Sennheiser are headphones for the passionate audiophile and are crafted for the most demanding listener. Built with a transducer design that delivers lower harmonic distortion, they provide a natural, lifelike audio experience and can be used to produce crisp bass, transparent mid-frequency response, and a natural treble when connected to high-res players or portable audio devices.

With an impedance of 150 Ohms and a frequency response of 10 Hz to 41 kHz, the HD 660 S headphones are equipped with a choice of cables that feature both balanced (4.4mm Pentaconn) and 1/4″ connectors. A 1/4″ to 1/8″ adapter is also included. This allows you to enjoy reference-class, high-fidelity sound with stationary and mobile audio players alike.

Audiophile Versatility
Enjoy the HD 660 S sound in even more listening situations. Thanks to a lower impedance than the previous HD 650 model, they deliver reference-class sound when connected to high-res mobile players. They indulge the demanding listener with aural precision and a comfortable fit.

Sound for the Passionate Music Enthusiast
Made for the demanding listener, the HD 660 S feature powerful performance with crisp bass, detailed mid-frequency response, and gentle, natural treble. These headphones immerse you in the emotion and nuance of the music. They are accurate and transparent.

Cutting-Edge Technology
Built with a transducer design that improves control of the diaphragm movements, the headphones are manufactured with precision stainless-steel fabric that adapts to the contour of the diaphragm. Aluminum voice coils ensure high impulse fidelity. Transducers are carefully selected and paired by hand to ensure consistently narrow tolerances (±1 dB).

Connectivity from Different Audio Sources
With their low impedance of 150 Ohms, the HD 660 S offer reference-class fidelity with high-res mobile players. They come with a choice of cables for just about any occasion. All cables are made of OFC copper, featuring very low handling noise and sturdy para-aramid reinforcement.

Designed for Comfort
The elliptical earcups are shaped to follow the anatomy of the ear, while thick padding on the headband and the replaceable ear cushions provide for hours of listening in comfort.

Nominal Impedance
A nominal impedance of 150 Ohms allows for direct connection to both stationary and mobile high-res Players.

Packaging Weight 1 kg
Packaging Dimensions 30 × 30 × 12 cm
Earpiece Design

Over-Ear (Circumaural), Open-Back

Earpiece Swivel


Earpiece Connection / Wearing Style




Driver Type


Driver Size

1.7" / 42 mm

Voice Coil

Copper-Clad Aluminum Wire


150 Ohms

Active Noise Cancellation


Contact Pressure

6.0 N

Frequency Response

9 Hz to 45 kHz

Total Harmonic Distortion (THD)


Audio Connector

1 x 1/4" TRS
1 x 4.4 mm TRRRS

Connector Plating


Included Adapter

1/8" / 3.5 mm TRS

Cable Design


Audio Connector to Earpiece


Cable Length

9.8' / 3 m

Cable Color


Cable Conductor Material

Oxygen-Free Copper

Operating Temperature

14 to 131°F / -10 to 55°C



LED Indicator



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GTIN: 0404415524956