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Reviews about this item

Review Summary

2022-08-16T08:25:20

Rated 5 out of 5

Comfortable and excellent!

Amazing product - has a very warm sound with an excellent sound stage. The build quality is also sturdy and reliable. Overall, one of the most comfortable and fun pair of headphones I've bought in a while.

BRIAN K.

2022-05-31T10:35:13

Rated 5 out of 5

Adorama is the best.

Once again a great product at a great Adorama deal price.

Donnie W.

2022-05-07T02:22:44

Rated 5 out of 5

A bargain at USD299

A bargain at USD299, high quality, recommend for anyone looking for a headphone

YU-SHENG S.

2022-05-04T08:24:03

Rated 5 out of 5

Good deal from a good vendor

It's my first time trying an open-eared headphone and it sounds divine. I got it on sale from Adorama and the headphone is perfect

JEONG P.

2022-04-28T14:41:44

Rated 5 out of 5

Will use for years to come

Best headphones I ever owned. Incredible imaging and resolution. Read some people mentioned the clamp is too tight but I actually don't find it that way at all!

RYAN T.

2022-04-22T07:31:23

Rated 5 out of 5

Generally impressed - very similar to the HD 580 / HD 600

I'm pretty happy with these for the price I paid. They're very similar to my older HD 580 headphones, but apparently a bit easier to drive. There are some changes to transient speed and bass, but they're hard to pin down even after switching back and forth with my HD 580 on the same track a few times. Overall the sound signature is quite similar.

ERIC A.

2021-03-09T07:23:24

Rated 5 out of 5

Fantastic set of cans

Amazing pair of headphones. I bought a FiiO k5 amp/dac to go with it and it pairs really well with it.

NIKHIL A.

2020-12-26T00:02:15

Rated 4 out of 5

worth the hype

Best sounding headphones I’ve ever used. They clamp down pretty tight. I’ve got some big ass ears but can wear them continuously for 4+ hours before I feel any discomfort.

LUKASZ W.

2020-12-23T10:04:15

Rated 4 out of 5

Nice sound, works well with Fiio k5 pro.

Nice sound, works well with Fiio k5 pro.

RAN Z.

2020-12-21T15:29:44

Rated 5 out of 5

Good headphones for daily use. Alright value.

I don't know why people are saying they're worse than the HD 650s. They're not supposed to sound like the HD 650s. These are objectively better, as in more neutral with more detail. The detail is somewhere between the HD 650s and HD 800 S IMO. Subjectively, they don't have that laid back tonality as much and I can totally see why some people prefer the 650s. I think the 650s better represent the 600 series while these are more like what the HD 700 should have been. Price wise, I don't think they are a good value at $500. I got them for $320 on sale and I think it's worth it if this is the sound signature you're looking for. The 650s aren't really much better in terms of tonality IMO. They've been meme'd to space and back since Drop released them for $200. And yes I've listened to them before.

ALEX L.

2020-12-21T08:04:55

Rated 4 out of 5

Fantastic cans for funk, pop, rock/alt

These were on sale for a great price on Black Friday so I decided to give them a try. Build quality is really really good. I've listened to them on both the FiiO K3 DAC/Amp and Schiit Fulla DAC/Amp. I find that they really excel in R&B, soul, funk, pop, rock/alternative, and jazz, but not so much in hip-hop, house, and techno. Highs are crisp and airy, mids are punchy, lows leave something to be desired. I'm still breaking them in so maybe their sound signature will change over time. They are also very very comfortable.

HARRY T.

2020-12-14T09:10:37

Rated 5 out of 5

Best headphones ever

Adorama was fast in shipping this. I have this paired with a JDS labs element. The sound stage is super clear and accurate.

DONALD J.

2020-12-13T17:20:06

Rated 5 out of 5

Great Service

Rapid delivery. Well paced. Great product! Thanks!

Timothy H.

2020-12-13T15:30:18

Rated 3 out of 5

half off, still too much

even at half the price they're too expensive for what you get.

Jeremiah F.

2020-12-13T07:27:32

Rated 5 out of 5

Excellent

Best headphones I’ve ever owned. They are amazing. Adorama sale price was the best.

SCOTT B.

2020-08-30T09:11:10

Rated 5 out of 5

Good buy

Outstanding sound quality that you would expect from a Sennheiser product. Fits more snug on the head than the HD650 line did.

MICHAEL B.

2020-08-16T10:56:41

Rated 4 out of 5

Excellent headphones if you want a "brighter" HD 650

Lovely phones but I did not like them better than my Sennheiser HD 650. It's a matter of personal taste of course, so if a bit more clarity and brightness at top is your thing these might be for you. Me, I prefer the HD 650 more laid back sound.

LES S.

Sennheiser HD 660 S Specifications

Headphone

Headphone

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  • Driver Type

    Dynamic

  • Design

    Over-Ear (Circumaural)

  • Earcup Style

    Open-Back

General

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  • Frequency Response

    10 Hz to 41 kHz

  • Impedance

    150 Ohms

  • Maximum Sound Pressure Level (SPL)

    104 dB at 1 kHz / 1 Vrms

  • Total Harmonic Distortion (THD)

    0.04%

Connectivity

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  • Audio Connector to Source

    4.4 mm 5-Pole

  • Connector Plating

    Gold

Physical

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  • Color

    Black

  • Weight

    9.2 oz (260g)

About Sennheiser HD 660 S Open-Back Audiophile-Grade Hi-Fi Stereo Headphone - #1409413

FEATURED REVIEWS

Comfortable and excellent!

By BRIAN K.

Amazing product - has a very warm sound with an excellent sound stage. The build quality is also sturdy and reliable. Overall, one of the most comfortable and fun pair of headphones I've bought in a while.

Adorama is the best.

By Donnie W.

Once again a great product at a great Adorama deal price.

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

A new audiophile versatility
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.

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 HD 660 S.

What's in the box:

  • HD 660 S Open-Back Audiophile-Grade Hi-Fi Stereo Headphone (Black)
  • 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
  • Original Box