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Sennheiser HD 660 S

Open-back over-ear headphones

Item # 143HD660S

Many of my Crutchfield co-workers credit Sennheiser's legendary "HD 600" series as their gateway...

Many of my Crutchfield co-workers credit Sennheiser's legendary "HD 600" series as their gateway...

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Item # 143HD660S

In stock
$499.99

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About the Sennheiser HD 660 S

A classic revisited

Many of my Crutchfield co-workers credit Sennheiser's legendary "HD 600" series as their gateway into the world of truly high-end personal audio. These HD 660 S headphones keep the spirit of their stellar predecessors alive. But they feature a tweaked design and completely revamped driver system.

A classic revisited

Many of my Crutchfield co-workers credit Sennheiser's legendary "HD 600" series as their gateway into the world of truly high-end personal audio. These HD 660 S headphones keep the spirit of their stellar predecessors alive. But they feature a tweaked design and completely revamped driver system.

The result is a smooth, timeless look and — more importantly — even greater musical detail. When paired with a high-performance headphone amp, you get great clarity with pinpoint imaging.  

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Product highlights:

  • over-the-ear design
  • open-back, metal mesh covered ear cups for spacious and transparent sound
  • latest model in Sennheiser's legendary HD600 series headphones
    • streamlined design with timeless matte black finish
  • we recommend a separate headphone amplifier for proper power and the best possible sound
Driver Design:
  • large dynamic drivers angled to create a more natural listening experience and a wider soundstage
  • cutting edge transducer design for tightly controlled diaphragm movement
    • diaphragm lined with stainless steel mesh for even airflow
  • lightweight aluminum voice coils ensure accuracy and fast transient response
General Info and Specs:
  • snug, cushioned fit
    • generous velour ear pads and soft headband padding
  • specially tuned 9-foot oxygen-free copper cable with balanced 4.4mm headphone plug
  • 9-foot oxygen-free cable with unbalanced 1/4" headphone plug
  • includes 3.5mm mini plug adapter
  • storage box
  • frequency response: 10-41,000 Hz (-10 dB)
  • sensitivity: 98 dB
  • impedance: 150 ohms
  • weight: 9.2 oz. (without cable)
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # 508826

What's in the box:

  • Over-ear headphones with 10' audio cable (1/4" plug)
  • 9" Adapter (1/4"-to-3.5mm)
  • 10' Balanced audio cable (4.4mm Pentaconn)
  • Hinged storage box
  • Instruction manual

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Sennheiser HD 660 S reviews

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8 reviews

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More details on the Sennheiser HD 660 S

Mark G.

Features & specs

General
Fit Style Over-the-ear
Earcup Type Open
Earcup Width x Height 3.252" x 4.288"
Noise-canceling No
Bluetooth No
Mic For Taking Calls No
Lightning Connector No
Frequency Response 10-41k Hz
Sensitivity 104 dB
Impedance 150 Ohms
Weight 12.3 ounces
Cord Length 120" + 120
1/4-inch Adapter Included No
Volume Control No
Parts Warranty 2 Years
Labor Warranty 2 Years

Product Research

Features

Overview: The Sennheiser HD 660 S high-end headphones feature an open design to give you an exceptionally natural, spatial, and accurate sound. Unlike closed, noise-isolating earcups, the HD 660 S's earcups have a specialty steel mesh, molded to the natural shape of the acoustic chamber, to provide an open environment. The HD 660 S features new, lower-impedance drivers with extremely light aluminum voice coils. The transducers are matched within +/- 1dB tolerances for consistent sound. The headphones come with two 10' cables, one with the new 4.4mm balanced connector, and a hinged storage box.

Angled Transducers: The HD 660 S has angled transducers to resemble the perfect positioning of a pair of reference monitors to put you in the center of the sweet spot. The ear cups are elliptical to follow the shape of the outer ear, with plush, velour-covered padded ear cushions for hours of listening comfort.

Headphone Cables: The HD 660 S comes with two interchangeable, 10-foot cables. One cable has a full-sized 1/4" plug. A 1/4"-to-3.5mm adapter is included for listening to portable devices. The other cable (also 10') is terminated with a new 4.4mm Pentaconn balanced connection that can be used with some high-end digital audio players (such as the Sony TA-ZH1ES) and headphone amplifiers (including the Sennheiser HDV 820). Both cables are constructed with OFC copper (oxygen-free copper) with its high conductivity for best signal transfer. The cable's outer jacket is coated to greatly reduce handling noise.

Storage Box: The HD 660 S has a sturdy, hinged box with cut-out foam padding for storage of your headphones and attached cable.

Specifications:

  • Frequency Response: 10-41kHz
  • Nominal Impedance: 150Ω
  • Sound Pressure Level (1 kHz/1V): 104dB
  • THD + N (1kHz/100dB): <0.04%
  • Maximum Input Power: 500mW
  • Weight: 9.2 ounces (w/o cable), 12.5 ounces (w/cable)

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Positive reviews, I already have the HD 650 since 2006. [ ROY  Feb 16, 2020 ]
A
Looks like a great product. [ John  Feb 26, 2019 ]
A
These headphones have a balanced output jack and can meet my needs better. [ Arthur  Nov 21, 2018 ]
A
Own other Sennheiser headphones [ MICHAEL  Apr 07, 2018 ]
A
Longtime fan of closed back headphones, owner of ATH M50x and ATH M70x looking for the transparency of an open back system. [ Richard  Feb 28, 2018 ]
A
reviews [ PETER  Jan 30, 2018 ]
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