Skip to Content

Sennheiser Consumer Audio HD 660S2 Wired Audiophile Stereo Headphones with Deep Sub Bass (Black)

  • mfr: 700240
  • SKU: 700240
In Stock

Available options:

  • Free standard shipping

    *Orders placed before 1 PM EST Mon - Thur will ship the same day. Orders placed beyond these hours will be shipped the next business day. Exclusions apply. See shipping policy

  • Free Local Pickup

    Please call for store stock availability.

    Requests made before 2:30 PM EST can be available for next-day pickup. Learn more

Additional options:

Product highlights

  • Wired audiophile stereo headphones
  • Extended sub-bass for a natural and warm sound
  • Comfortable open-back design
  • Unique, powerful vented magnet system for minimized-distortion
  • Intimate sound with great timbre and deep, accurate sub-bass
  • Outstanding quality designed in Germany, made in Ireland
  • Ultra-light aluminum voice coil with 300 ohm impedance
  • Excellent impulse response
  • Plush ear cushions and open design for maximum comfort
  • Available in Black color

Sennheiser Consumer Audio HD 660S2 Wired Audiophile Stereo Headphones with Deep Sub Bass (Black)

Enjoy your music on a completely new level with the Sennheiser HD 660S2 Headphones. An intimate, relaxed sound signature combines with outstanding precision and exceptional comfort - and now, extended sub-bass - for a deeply moving experience.
Your New Desert Island Headphone
Ever felt goosebumps from sound so real, it was as if the source was in the room with you - The non-fatiguing HD 660S2 gives people who love music an intimate way to connect more deeply with their favorite songs and artists. Breath-taking resolution and precision take you closer than ever to instruments and vocalists. Yet the sound is natural and balanced, never harsh or brash. This 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. That’s how HD 660S2 combines the best of many worlds to give you an intimate experience you won’t want to live without.
Sub Bass Expands The Entire Sound
Traditionally, audiophiles don’t get too excited about sub-bass. It can easily get sloppy or boomy and become a distraction. And that’s a shame - because there’s so much more to experience here than just the gut punch of a kick drum. Did you know the low B of a 5-string bass vibrates at 30.9 Hz - or that the lowest note on a concert piano comes in at 27.5 Hz - and of course, extended sub-bass makes bass-heavy genres sound fantastic, too. And that’s the magic trick here. In doubling the sound pressure at the very lowest frequencies, have nevertheless retained extraordinary precision and balance throughout the sub-bass, mid-bass, and beyond. Most impressive is how this affects the listening experience. Extension on the low end changes everything - by creating more space for the sound. Against a deeper backdrop, highs feel more brilliant, the soundstage deeper, and emotions stronger.
They Feel As Great As They Sound
Comfy slippers, your favorite jeans, the HD 660S2. Some things just feel awesome to wear. The velour earpads of the HD 660S2 can only be described as a tactile pleasure. With just the right amount of tension for proper acoustic positioning and supple padding, the headband won’t draw attention away from your music, either. As an open-back design, the HD 660S2 gives your ears an extremely comfortable climate, even for super-long sessions. The low total weight and ergonomic headband rule out any potential discomfort on top of your head as well. Combined with excellent build quality made in Ireland, you’ll quickly grow attached to a listening experience that’s as physically pleasing as the warm, non-fatiguing sound at its heart.
How to Do You One - Up A Line of Legends
Some of the most neutral headphones in the world are a tough act to follow. As far back as the HD 580, high-end Sennheiser headphones have inspired generations with their balanced, natural reproduction. Recognized as benchmarks for neutral audiophile sound, the HD 600, HD 650, and HD 660S all share visible and audible DNA with the HD 660S2. The revised coil of the S2, for instance, now matches the 300-ohm impedance of the legendary HD 600 and HD 650. This new coil also provides higher magnetic force and electrical dampening for cleaner impulse response. The surround is now more compliant, too, dropping the resonant frequency to 70 Hz. Considerable effort also went into optimizing the airflow around the transducer. There’s more sensitivity over the entire frequency spectrum because the magnet´s air gap works more efficiently now. Taken together, these measures result in even greater precision, speed, and resolution - with double the sound pressure at the lowest frequencies.

Specifications

Headphone
Driver Type Dynamic
Earpiece Swivel No
Wearing Style Circum Aural
Voice Coil Copper-Clad Aluminum Wire
Physical
LED Indicator No
Configuration Core
Battery
Wireless Charging No
Wireless Connectivity
NFC No
Multipoint Support No
Microphone
Beamforming Support No

Questions

Customer Questions
No Questions

Returns

Returns are incredibly simple. Please log into your account, find your item you wish to return and follow the prompts to make a return. If you do not have an account, click here to find your order and make a return.
You will receive a full refund when you return an item in its original manufacturer’s packaging, undamaged and unmarked. If the item you are returning is priced at less than $35, you will be charged a 15% restocking fee. Please note you will not be refunded any shipping charges. 
You have 30 days to make a return. During the holiday season, from November 1 to December 31, we extend the return window to 60 days. 
If your order has been noticeably damaged in transit, we strongly recommend that you refuse delivery and notify us immediately. Claims for missing items or items damaged in transit must be made within 48 hours of delivery. If there is carrier damage, please contact support@focuscamera.com with your order number and a description of the damage. 
Oh no! Please contact our customer service team so we can resolve the issue immediately. You can call us on 1.800.221.0828, email us at support@focuscamera.com, or send us a message here.  
We do not currently offer exchanges. Please return the item you purchased within 30 days and order what you’d like instead. 
If you ordered a kit, you must return all components and accessories to receive a full refund. 
If you ordered a product that included a free item, you must include the free item with your return. If not, your return will not be accepted and you will not receive a full refund. 
We currently only offer camera repairs at our Brooklyn store. The item must be dropped off and collected in person as we do not accept shipped items for repair. For more information, please call our Brooklyn store on 1.718.431.7900. 
Most items can be returned within 30 days for a full refund. Click here to read our full return policy. 

Shipping and Returns

Same Day Shipping

All orders placed by 4PM( EST), Monday through Thursday, and by 11AM (EST) on Friday, are shipped same day. Orders placed outside these times will ship the next business day. We do not ship internationally or to Puerto Rico, Guam and other US territories at this time. For more details click here.

Free Two-Day Shipping

We offer free expedited shipping on thousands of items within the continental USA (this does not include Alaska and Hawaii).

Flexible, Easy Returns

If you're not happy with your purchase for any reason, our flexible 30-day free return policy makes it easy to get a full refund. Click here to view our return policy.

Ratings and reviews

Akeneo image 700240_1

Sennheiser Consumer Audio HD 660S2 Wired Audiophile Stereo Headphones with Deep Sub Bass (Black) SKU: 700240

Rated 5 out of 5 by from 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...
Date published: 2025-05-05
Rated 5 out of 5 by from 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.
Date published: 2025-04-07
Rated 5 out of 5 by from 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
Date published: 2025-03-06
Rated 5 out of 5 by from 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
Date published: 2025-02-11
Rated 5 out of 5 by from Awesome Buy Bought this as an early Christmas gift for myself and was not disappointed by it one bit. Definitely worth the buy.
Date published: 2024-12-17
Rated 5 out of 5 by from 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.
Date published: 2024-12-13
Rated 4 out of 5 by from 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?
Date published: 2024-09-24
Rated 5 out of 5 by from 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
Date published: 2024-02-02
  • y_2025, m_5, d_17, h_6
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.42
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_15
  • loc_en_US, sid_700240, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_focus_camera
  • bvseo_sdk, p_sdk, 3.2.1
  • CLOUD, getReviews, 9.81ms
  • REVIEWS, PRODUCT

Customers also viewed

Navigating through the elements of the carousel is possible using the tab key. You can skip the carousel or go straight to carousel navigation using the skip links.
Special Price $329.99 Regular Price $399.99

Free standard shipping included

loader
Loading...