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Sennheiser HD 660S2 Open Over-Ear Headphones with Optimized Surround & Improved Transducer Airflow - 2 of 4Sennheiser HD 660S2 Open Over-Ear Headphones with Optimized Surround & Improved Transducer Airflow - 3 of 4Sennheiser HD 660S2 Open Over-Ear Headphones with Optimized Surround & Improved Transducer Airflow - 4 of 4
Sennheiser HD 660S2 Open Over-Ear Headphones with Optimized Surround & Improved Transducer Airflow - 1 of 4

Sennheiser HD 660S2 Open Over-Ear Headphones with Optimized Surround & Improved Transducer Airflow

$479.95 reg $679.95
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About this item

Highlights

  • The new HD 660S2 provides n intimate, relaxed sound signature combines with outstanding precision and exceptional comfort
  • The open-back design and plush ear cushions offer exceptional breathability for long listening sessions
  • 38mm high-performance transducers with steel mesh damping and milled air vents for optimal ventilation and minimal distortion
  • Ultra-light aluminum voice coil with 300-ohm impedance for excellent impulse response
  • Global 2-year warranty offers peace of mind for your audio equipment investment

Description

Dive Deeper Into Legendary SoundEnjoy your music on a completely new level. An intimate relaxed sound signature combines with outstanding precision and exceptional comfort and now extended sub-bass for a deeply moving experience. The extremely precise yet non-fatiguing sound of the HD 660S2 delivers even more impact with extended sub-bass. With an optimized surround transducer airflow and coil Sennheiser's engineers doubled the sound pressure at the lowest octaves. You can feel the lowest note on the piano or the kick of the bass drum as if you were there. The relaxed tone and open-back design make these extremely comfortable headphones great for long sessions. With warm tuning smooth treble and strong bass the standard setter for extended listening is now the standard setter extended bass as well.

Features
•Uniquely powerful vented magnet system for minimized distortion
•Intimate sound with great timbre and deep accurate sub bass
•Ultra-light aluminum voice coil with 300-ohm impedance for excellent impulse response
•Plush ear cushions and open design for maximum comfort

Audiophile SoundThis warm inviting signature combined with extended sub-bass makes listening uniquely pleasant and rewarding. And with comfort this good it practically begs you to keep going for endless sessions. Thats how HD 660S2 combines the best of many worlds to give you an intimate experience you wont want to live without.

Exceptional ComfortThe low total weight and ergonomic headband rule out any potential discomfort on top of your head as well. Combined with excellent build quality youll quickly grow attached to a listening experience thats as physically pleasing as the warm non-fatiguing sound at its heart.

Whats in the Box
•HD 660S2 Open Over-Ear Headphones with Optimized Surround Improved Transducer Airflow
•6.3 mm cable (5.9 ft)
•4.4 mm cable (5.9ft)
•6.3 mm to 3.5 mm adapter
•Carry pouch

Specifications
•Transducer principle: Dynamic open
•Transducer size: 38 mm
•Frequency response: 8 Hz - 41500 Hz
•Impedance: 300
•Sound Pressure Level (SPL): 104 dB (1 V)
•Total Harmonic Distortion (THD): 0.04% (1 kHz 100dB)
•Style: Over-ear
•Weight: 0.57 lbs (260g)
•Adapter: 6.3 mm (14 inch) to 3.5 mm
•Connector: 6.3 mm (14 inch) jack plug 4.4 mm balanced plug
•Cable length: 1.8 m (5.9 ft)
•Country of origin: Ireland
•Magnetic field: 2.5 mT

Weight: .57 pounds
Water Resistance: No Water Resistance Rating
Ear Cushion Material: Leatherette
Electronics Condition: New
Electronics Features: Adjustable Headband, Lightweight Design
Connection Type: 3.5mm Audio
Compatible With: Android, Apple iOS
Voice assistant built-in: No Voice Assistant Built-In
Wireless Technology: No Wireless Technology
Microphone: No Built-In Microphone
Noise Canceling: No Active Noise Canceling
Wireless Type: Wired
Package Quantity: 1
Battery: No Battery Used
Warranty: 2 Year Limited Warranty. To obtain a copy of the manufacturer's or supplier's warranty for this item prior to purchasing the item, please call Target Guest Services at 1-800-591-3869
TCIN: 88662392
UPC: 810091270370
Origin: made in the USA or imported
The above item details were provided by the Target Plus™ Partner. Target does not represent or warrant that this information is accurate or complete. On occasion, manufacturers may modify their items and update their labels.
We recommend that you do not rely solely on the information presented. If you have a specific question about this item, you may consult the item's label, contact the manufacturer directly or call Target Guest Services at 1-800-591-3869.
If the item details aren’t accurate or complete, we want to know about it.

Shipping details

Estimated ship dimensions: 8 inches length x 5 inches width x 10 inches height
Estimated ship weight: 2 pounds
This item cannot be shipped to the following locations: American Samoa (see also separate entry under AS), Guam (see also separate entry under GU), Northern Mariana Islands, Puerto Rico (see also separate entry under PR), United States Minor Outlying Islands, Virgin Islands, U.S., APO/FPO, Alaska, Hawaii
item ships from third party seller: WORLD WIDE STEREO

Return details

This item can be returned to any Target store or Target.com.
This item must be returned within 30 days of the date it was purchased in store, delivered to the guest, delivered by a Shipt shopper, or picked up by the guest.
See the return policy for complete information.

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Guests are saying

The headphones offer an impressive sound quality with clarity and detail, making them suitable for both music lovers and professionals. Guests appreciate their comfort and build quality, noting that they can wear them for extended periods without discomfort. While some mention a lack of bass and clamping force, many find the overall audio experience enjoyable, especially for genres like jazz. The headphones are praised for their stylish design and ability to reveal nuances in music, making them a worthwhile investment.
    Summary created by AI from text of reviews reflecting recent feedback provided across different star ratings (includes incentivized reviews)
    4.7 out of 5 stars with 28 reviews
    4 out of 5 stars
    23 January, 2026
    originally posted on Sennheiser
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    Good, not great

    The bass is lacking. I really feel like something is missing.
    jmc
    Did you find this review helpful?
    5 out of 5 stars
    28 December, 2025
    originally posted on Sennheiser
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    Good Headphones

    I love the headphones, they had amazing clarity and range, there was nothing wrong with the audio.
    Sky123
    Did you find this review helpful?
    5 out of 5 stars
    12 December, 2025
    originally posted on Sennheiser
    Image

    Beautiful music!

    I'm totally satisfied with the headphone. Well built and comfortable to wear. The vivid sound stage and meticulous details of replayed music are highly enjoyable. Not strong in dynamics but the beautiful music, particularly of jazz and vocalist, more than makes up for it.
    Vincent
    Did you find this review helpful?
    5 out of 5 stars
    5 December, 2025
    originally posted on Sennheiser
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    Cool upgrade from my HD650 pair

    Compared to my old HD650 pair these new 660S2 cans are more appealing - the old ones were great but boring, these have some cool style and the accurate sub bass will help mixing, these are ustill neutral and flat enough to use seriously for judging the tonal characteristics of a mix
    Jazzman
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    5 out of 5 stars
    8 July, 2025
    originally posted on Sennheiser
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    AntSlappy’s HD 660S2 mods

    I pulled out the black foam in the middle/inside of each “can” and got a WAY BETTER CABLE and WAY BETTER EAR PADS!!! Now these sound/perform WAY BETTER THAN STOCK!!!
    AntSlappy
    Did you find this review helpful?
    5 out of 5 stars
    20 June, 2025
    originally posted on Sennheiser
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    Incredible sound!!

    I absolutely love these headphones. Paired with the right DAC and Amp they make magic happen!!!
    SonicFlash
    Did you find this review helpful?
    5 out of 5 stars
    5 May, 2025
    originally posted on Sennheiser
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    Supreme Quality

    I am very happy with this purchase. Supremely comfortable to wear, very nice/quality engineering produces a high fidelity sound experience... I particularly appreciate Sennheiser following up with the sound samples via email, whereby I received a 'guided tour' of the capabilities built into these headphones... Supreme quality - excellent sound reproduction - no regrets, would buy again...
    jwestbrook
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    5 out of 5 stars
    7 April, 2025
    originally posted on Sennheiser
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    Way better than expected

    I bought the 660S2 HP expecting mid level performance in this day and age of 3K to 6K top of the line HP. Was very surprised when I A/B'd this set with Hifiman Susvaras. Bass response was very good; attack and decay was better in the Sennheisers vs the Susvara. The Sennheisers were considerably warmer sounding than the Susvara, but in a musical way, not muddy or smearing. The Susvara has a bit more "air" and inner detail, but not 6K worth. I did not experience a broad sound field with either HP. Subtle detail like the bells in John Klemmers Touch were a bit more evident in the Susvara but still very much present in the 660s. Driving the Sennheisers was considerably easier than the Susvaras as has been noted elsewhere, but cabling is less critical with the more sensitive Sennheiser's higher 300 ohm impedance; wire gage makes less of a difference if you have longer wire runs as opposed to the low sensitivity 60 ohm Susvara. I found I had to crank my class A HP amp up full volume with the Susvara leaving little headroom. The Sennheisers were easily driven with that amp with plenty of headroom. I generally I was very surprised at how good the Sennhesiers are, and they are probably 80 to 90% of the performance of the Hifiman product, some may find them overall better.
    DHL
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    5 out of 5 stars
    6 March, 2025
    originally posted on Sennheiser
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    desert island headphones indeed

    incredible feel pure sound I can hear all the different parts to the music comfy lackluster packaging - but I bought headphones, I don’t care about how they’re stored
    Ernest_loves_moon
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    5 out of 5 stars
    11 February, 2025
    originally posted on Sennheiser
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    Sennheiser knows what they are doing, Bravo!

    Solid construction. you can feel the quality. Don't let the plastic deter you from buying these. The clamping force is a little much, but I have a large head. I used my headphone holder, with a couple of folded cloths, to widen the clamping and it now fits perfect. You can wear these all day with no ear fatigue or head pain. The sound is amazing. The sub bass is present without being muddy. I EQ with my HD600 but the 660S2 does not need it. They pair will with my Schiit Valhalla 2 tube amp. Not only is this an upgrade to the HD600 (for me), but the 660S2 stands on its own as a great, open-back headphone
    DrewDog5031
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    5 out of 5 stars
    17 December, 2024
    originally posted on Sennheiser
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    Awesome Buy

    Bought this as an early Christmas gift for myself and was not disappointed by it one bit. Definitely worth the buy.
    WalkerB
    Did you find this review helpful?
    5 out of 5 stars
    13 December, 2024
    originally posted on Sennheiser
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    Novice+ Audiophile Experience

    I just purchased my HD660S2 on Black Friday, upgrading from Sennheiser PXC 550 II. I'm a lifetime music lover that just in recent years got interested in hires lossless music. The 660s2 along with Questyle M15i DAC using 4.4mm balanced output is a tremendous sound quality difference with Qobuz music. I can hear a lot of little nuances in the music that wasn't noticeable previously. It was a great investment that I had on my radar for a few years.
    RK66
    1 guest found this review helpful. Did you?
    4 out of 5 stars
    24 September, 2024
    originally posted on Sennheiser
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    Break in is not an option

    Pushing them with a McIntosh 7200 and honestly my first hour was pure buyer’s remorse. After 10 hours not so muffled but hoping for more clarity especially in the treble range. Bass is not the problem. So hopefully more time may help but we’ll see. You’ll need an extension if you’re going to be couch lounging. What’s with the useless black bag? Really?
    Avi8tr
    Did you find this review helpful?
    5 out of 5 stars
    7 September, 2024
    originally posted on Sennheiser
    Image

    Great look and great sound 👍

    Look great with outstanding sound ,i love it…😁👍👍
    Tan58
    Did you find this review helpful?
    5 out of 5 stars
    2 February, 2024
    originally posted on Sennheiser
    Image

    Best one so far

    I went to these from some DT 990 Pro's 250ohm. and lemme tell you something. its been about 2 months but im still sold that these will be my forever headphones. I have never felt that way about headphones. They sound FULL, very full. Super detailed and clean, and pretty good sub bass. I have them paired with a FiiO k5 pro
    LilStun
    1 guest found this review helpful. Did you?
    2 out of 5 stars
    22 January, 2024
    originally posted on Sennheiser
    Image

    Not the upgrade it is purported to be

    Touted as the upgrade to the HD 650, but it's more like the upgrade to the HD 58X from Drop. Doesn't have any of the midrange magic of the 6 series, has meaningfully brighter and harsher treble, and is significantly more expensive. Looks incredible (love the colorway) but sonically it's a miss for me across the board.
    listener6x0
    1 guest found this review helpful. Did you?
    5 out of 5 stars
    4 January, 2024
    originally posted on Sennheiser
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    They are better

    Nearly every review I have read and YouTube video I have watched has told me that the 600’s and 650’s are superior to the newer 660s2’s despite their age, so I believed them and bought some 650’s. Yes they are exceptional cans and deserve their legendary status, but curiosity got the better of me and decided to try the 660s2’s. Granted I’m no expert, but I think the 660s2’s are better headphones in every single department. Ever so slightly more comfortable, a smidge more bass, a tad more detail, a bit wider soundstage and a more modern, stylish paint job. I think they are a step forward, not by much, but how could they be? Sennheiser shot themselves in the foot all those years ago by setting the bar so high.
    MJ84
    Did you find this review helpful?
    5 out of 5 stars
    21 October, 2023
    originally posted on Sennheiser
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    Awesome upgrade after 20y

    Sound is superb. A great upgrade from HD 650. Not as amplifier dependant. Not as colored as 650. Just as detailed & vivid but more neutral overall, plus subbass which is lacking in 650.
    jorcap
    Did you find this review helpful?
    4 out of 5 stars
    23 April, 2023
    originally posted on Sennheiser
    Image

    Great sound, however

    Sound quality is excellent; in fact the best so far to my personal taste. Compared to what? Compared to my other headphones which include: Sennheiser True Wireless in Ear, Sennheiser Momentum wired in ear, Bose SoundLink On-Ear, Bose QuietComfort 15 Over ear and Stax SR-L500 Mk2 (through SRM-400S amp). The difference to the STAX is most notable, having the bass that the STAX is so wowfully lacking. A few reviews in magazines have noted one significant negative point, namely that the clamping force is rather high and I can certainly confirm this. It's high enough to be sufficiently unconfortable that I am debating whether to keep these headphones or not. If Sennheiser offered slightly thinner ear pads or some other little trick to reduce the pressure then these would be 100% keepers; as is I'm not so sure. In summary: great sounding headphones let down by a simple comfort problem.
    Nick
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    5 out of 5 stars
    19 April, 2023
    originally posted on Sennheiser
    Image

    really good

    amazing sound quality + comfortable ear-pads. Love that my ears can finally breathe during extended wear periods. my only complaint is they fit slightly too snug, and perhaps too little padding on the top band. Overall, very satisfied. Thanks
    Chris
    Did you find this review helpful?

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