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by Marc Rushton

13th October, 2017


Head-Fi enthusiasts were getting excited with the speculation this week of two new previously unconfirmed headphone releases.

The first of the two releases, StereoNET has confirmed Sennheiser has launched a new open-back dynamic headphone that builds on the legacy of the HD 650. 

Sennheiser says its new HD 660 S delivers even better sound, comfort, and versatility, and features a new and improved transducer design that delivers lower harmonic distortion. It also features a lower impedance of 150 Ohms.

Sennheiser HD660S Headphones

The drivers look very similar to those used on the HD 700, although early listening impressions suggest the sound is similar to the HD 650 but with more pronounced sub bass.

Axel Grell, who looks after 'Audiophile' products for Sennheiser told StereoNET:

The HD 660 S reflects and enriches today’s increasingly multifaceted audiophile experience. It frees listeners to enjoy music to the fullest – whether digital or analog, on a mobile device or on a home HiFi system,

Thanks to a specially manufactured precision stainless steel fabric which is adapted to the contour of the diaphragm,  control of diaphragm movements are improved.

Sennheiser HD660S Diaphragm Detail

Sennheiser carefully select and match the diaphragms by hand to ensure consistently narrow (± 1 dB) tolerances.

Together, these refinements achieve the authentic, lifelike sound of the HD 660 S – with crisp bass, excellent mid frequency response and a gentle, pleasantly natural treble.

The new HD 660 S boasts a matt black and anthracite design while their robust but lightweight construction should allow for hours of comfort.

They feature elliptical ear cups to follow the anatomy of the ear and utilise thick padding on the headband. Unlike many other brands, Sennheiser also offers replaceable ear cushion ensuring your investment will last for many years.

The lower impedance will lend itself to digital audio players and smartphones and are supplied with detachable cables, with either a 6.35mm stereo plug or balanced 4.4mm Pentaconn stereo plug. A 6.35mm to 3.5mm adaptor is also included.

The Sennheiser HD 660 S will be available mid-November and will sell for $799.95 locally.

For more information visit Sennheiser.


Marc Rushton's avatar

Written by:

Marc Rushton

StereoNET's Founder & Publisher and still buried deep in the review room auditioning everything from docks to soundbars, amplifiers and headphones. Marc is also the founder of the annual International HiFi Show.

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Posted in: Headphones
Tags: sennheiser