2 years international warranty
30 days free return
HD 660S Phased Out
HD 660S Phased Out
HD 660S Phased Out
HD 660S Phased Out
HD 660S Phased Out
HD 660S Phased Out

HD 660S Phased Out

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Article number: 508826

The new HD 660 S lets you enjoy sophisticated audiophile sound in even more listening situations. The successor of the legendary HD 650 excels with the improved performance of its new transducer design. Thanks to its lower impedance, it delivers reference-class sound also when connected to hi-res mobile players, thus offering much greater versatility. The HD 660 S is an elegantly designed piece of high-quality engineering that indulges the demanding listener with aural precision and great wearing comfort.


Sennheiser’s new HD 660S is the ideal open, dynamic headphone for the passionate audiophile.

Sound for the passionate music enthusiast

Made for the demanding listener, the HD 660 S surpasses the exceptional performance of its predecessor, the legendary HD 650. With a crisp bass, excellent mid-frequency response, and a gentle, pleasantly natural treble, the HD 660 S has an expressiveness that immerses you in every emotion and nuance of music. Still, it always stays exceptionally accurate and transparent.

Cutting-edge Sennheiser technology

The HD 660 S features a new transducer design developed by Sennheiser. This results in improved control of the diaphragm movements thanks to a specially manufactured precision stainless steel fabric, which is adapted to the contour of the diaphragm. Extremely light aluminum voice coils ensure the highest impulse fidelity. The transducers are carefully selected and paired by hand to ensure consistently narrow (±1 dB) tolerances.

Supreme connectivity

The HD 660 S has been created to enjoy music in supreme quality and from many different audio sources. Thanks to its low impedance it also offers reference-class fidelity with hi-res mobile players. Naturally, the HD 660 S reveals its full potential when it is connected to the balanced outputs of a dedicated headphone amplifier such as the HDV 820 or to the balanced output of a mobile digital audio player. Accordingly, it comes with a choice of cables for just about any occasion. All cables are made of highly conductive OFC copper, featuring very low handling noise and sturdy para-aramid reinforcement.

Designed for high-end comfort

Everything about the HD 660 S makes listening a pure pleasure – not least its strong yet lightweight open construction. The elliptical ear cups are shaped to follow the anatomy of the ear, while thick padding on the headband and the replaceable ear cushions guarantee hours and hours of listening in supreme comfort.

The look of sophistication

The pure and effortless sound of the HD 660 S is reflected in its new matte black and anthracite design. It is a high-end aesthetic that embraces both timeless elegance and contemporary style – uncompromising in its craftsmanship, like everything about the HD660S.


Wearing style Headband
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 circumaural
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

Customer Reviews

Based on 22 reviews
tadashi katoh

HD 660 S

chris o'neill
Pretty much perfect

These days I stream much more music than I play from traditional media, so I thought it was time I got headphones as good as my main speakers.
The 660S has at least as much range and presence as my big Tannoys (and the image is better, as you'd expect). They need a headphone amp most of the time, but I already had a small Arcam, which is easily good enough.
I find them very comfortable and given the quality they were a very fair price. Considering the extra convenience of being able to carry them from room to room, the considerably wider range of music now that I can search online, and my partner's delight that she no longer has to share my listening preferences ... I might even be retiring those big Tannoys someday soon.

Robert Andreas Havn Andresen
Great value

I purchased the HD 660 S headphones directly from Sennheiser for NOK 3500. This is amazing value and a great upgrade from my previous HD 595 headphones. Time from order until I had them in my hands was less than 2 business days, and the shipping was free! Compared to my HD 595 these have more pronounced bass and great comfort with more even clamping force on the head. I have paired them with a Benchmark DAC1 which works great.

Simon York
The best I’ve owned

I have used headphones to produce and listen to music and also in video production. These HD660s headphones are the best I’ve used in 30 years.

Colin Fraser
Col on Sennheiser 660s

The headphones give clear and detailed sound and delivery was very prompt.