2 years international warranty
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HD 660 S
HD 660 S
HD 660 S
HD 660 S
HD 660 S
HD 660 S

HD 660 S

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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 38 reviews
Open back solution

These headphones are incredible for mixing, so much clarity and detail delivered for each instrument in the mix. Should have bought these sooner!!!

HD 660S Sher gut

Den HD 660 S verwende ich mit Mrantz NR1200 Vestäkrer der Klang ist sehr gut, ideal für Jazz und Klassik.
Die Verarbeitung ist sehr gut.

Good buy at the current (clearance?) price

I could compare it to a few years old Sonus Faber Pryma. Both on a Ifi Goblu, both with Pentacon connectors. Although I am not an expert, they sounded very different. Besides the huge difference in sensitivity, the HD 660S is more detailed. The lack on the low end does not bother me as much, as the added "colour" on treble. With some EQ it can be balanced out, and then it still beats the Pryma, but for the original price I'd have expected more. For the current price it is quite all right.
As for terms of daily use, it is more an "at home" headphone, and not that much suited for outdoor use.
The box it comes in is fancy, but unnecessary, as it it nor as fancy, nor as practical as I'd use it for daily storage.

Für mich als Hobbyanwender ok.

Da mit hohem Rabatt zu bekommen, ging für mich der Kauf in Ordnung.

Grab one while it last !!

Wonderfull headphone at a very nice price. I mostly listen to classical music, soundstage and instruments separation are quite evident on this headphone, not to much distance from the HD800 series.
I paired it with a dedicated headphone amplifier and its a heavenly combo.
Sennheiser service was 5 stars, super fast shipment and 30 days return policy... not used, because this is a keeper.