Sennheiser HD 660S2
The 42mm dynamic drivers and open-back design deliver a wide soundstage with bass extension down to 9Hz, while the 300-ohm impedance requires a capable amplifier for optimal performance. Handcrafted in Germany and Ireland, its lightweight 300g chassis and breathable ear cushions provide lasting comfort, and the aluminum voice coil yields precise transient response. These headphones are best for studio engineers and audiophile listeners who need an accurate, spacious reference for mixing and critical music analysis.
About This Headphones
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product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.Video Player is loading.Click to play videoPlayMuteCurrent Time 0:00/Duration 0:00Loaded: 0%Stream Type LIVESeek to live, currently behind liveLIVERemaining Time -0:00 1xPlayback RateChaptersChaptersDescriptionsdescriptions off, selectedCaptionsCaptions off, selectedAudio TrackFullscreenThis is a modal window. (window.AmazonUIPageJS ? AmazonUIPageJS : P).load.js('https://m.media-amazon.com/images/I/51ckmXPzM3L.js?AUIClients/VSEPlayer'); (window.AmazonUIPageJS ? AmazonUIPageJS : P).load.js('https://m.media-amazon.com/images/I/41Vu0w0zP-L._RC|01x4giTy+uL.js,01r9LpT6pbL.js,41NWBkfooBL.js,11QfrzttlqL.js,91VXiFQ1TCL.js,01ELLYeIOkL.js_.js?AUIClients/Brila'); (function(f) {var _np=(window.P._namespace("vse-ns-initVSEPlayerOnLoad"));if(_np.guardFatal){_np.guardFatal(f)(_np);}else{f(_np);}}(function(P) { P.when('VSEPlayer').execute(function(vsePlayer){vsePlayer.initPlayer('aplus-7661-player-ps');}); //Please use below event to register FeedbackForm P.when('A', 'VSEComponentAssets').execute('vse-ns-player-initialization', function(A, asset) { A.trigger('vse:ns:player:aplus-7661:init', 'aplus-7661-player-ps'); }); })); <img alt="Sennheiser HD 660S2" src="https://m.media-amazon.com/images/S/aplus-media-library-service-media/fea80dbf-7cab-45c0-8f21-171216100c2d.__CR0,0,1464,600_PT0_SX1464_V1___.jpg"/> Your new desert island headphone An intimate experience you won’t want to live without. The non-fatiguing HD 660S2 gives people who love music an intimate way to connect more deeply with their favorite songs and artists. Breathtaking resolution and precision take you closer than ever to instruments and vocalists. Yet the sound is natural and balanced, never harsh or brash. <img alt="Sennheiser HD 660S2" src="https://m.media-amazon.com/images/S/aplus-media-library-service-media/f4dbe56b-d4c6-45d3-b3b1-6f95dda43c8c.__CR0,0,1464,600_PT0_SX1464_V1___.jpg"/> Sub bass expands the entire sound Double the sub bass heightens your listening experience. By doubling the sound pressure at the lowest frequency, we retained incredible precision and balance throughout the sub-, mid-bass, and beyond. Extension on the low end changes everything, creating more space for the sound. Against a deeper backdrop, the highs feel more brilliant, emotions stronger. Enjoy your music on a completely new level. <img alt="Sennheiser HD 660S2" src="https://m.media-amazon.com/images/S/aplus-media-library-service-media/5fbef964-be44-400c-95c7-96490a86c70b.__CR0,0,1300,700_PT0_SX650_V1___.jpg"/> They feel as great as they sound The velour earpads can only be described as a tactile pleasure. With 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. <img alt="Sennheiser HD 660S2" src="https://m.media-amazon.com/images/S/aplus-media-library-service-media/24231b9d-3efa-45f7-8d6e-1c6e282ae71d.__CR0,0,1300,700_PT0_SX650_V1___.jpg"/> How do you one-up a line of legends? High-end Sennheiser headphones like the HD 600, HD 650, and HD 660S are known for their balanced, natural sound. The HD 660S2 shares this legacy with a revised 300-ohm coil for cleaner impulse response, a compliant surround for lower resonant frequency, and optimized airflow for better sensitivity. <img alt="Sennheiser HD 660S2" src="https://m.media-amazon.com/images/S/aplus-media-library-service-media/cb052c66-ebb9-4d33-aa42-b8987983eb7a.__CR0,0,1464,600_PT0_SX1464_V1___.jpg"/> Dive deeper into your game Natural, non-fatiguing sound for gamers and streamers. Do you recognize the feeling of listening to harsh sounds that annoy you for long periods of time? The HD 660S2 has been developed for detailed yet fatigue-free treble reproduction to keep you focused all day long. With comfort this good, you’ll be ready to extend your gaming sessions even further. Find your perfect audiophile headphones HD 660S2 Add to Cart logShoppableMetrics("premium-module-5-comparison-table-scroller", true) HD 599 Add to Cart logShoppableMetrics("premium-module-5-comparison-table-scroller", true) HD 560S Add to Cart logShoppableMetrics("premium-module-5-comparison-table-scroller", true) HD 600 Add to Cart logShoppableMetrics("premium-module-5-comparison-table-scroller", true) HD 650 Add to Cart logShoppableMetrics("premium-module-5-comparison-table-scroller", true) HD 800 S Add to Cart logShoppableMetrics("premium-module-5-comparison-table-scroller", true) Customer Reviews .aplus-v2 .aplus-review-right-padding { padding-right: 0.1rem; } 4.5 out of 5 stars 714 .aplus-v2 .aplus-review-right-padding { padding-right: 0.1rem; } 4.6 out of 5 stars 6,065 .aplus-v2 .aplus-review-right-padding { padding-right: 0.1rem; } 4.6 out of 5 stars 3,566 .aplus-v2 .aplus-review-right-padding { padding-right: 0.1rem; } 4.7 out of 5 stars 3,144 .aplus-v2 .aplus-review-right-padding { padding-right: 0.1rem; } 4.6 out of 5 stars 3,061 .aplus-v2 .aplus-review-right-padding { padding-right: 0.1rem; } 4.4 out of 5 stars 522 Price $419.99$419.99 $148.99$148.99 $149.95$149.95 $272.00$272.00 $338.93$338.93 $1,799.95$1,799.95 Sennheiser Transducer 42mm transducer 38mm transducer 38mm transducer 42mm transducer 42mm transducer 56mm transducer 56mm Ring Radiator System ✘ ✘ ✘ ✘ ✘ ✔ Reference Grade Sound ✔ ✘ ✔ ✔ ✔ ✔ Open Back Design ✔ ✔ ✔ ✔ ✔ ✔ Metal Headband w/Inner Damping ✘ ✘ ✘ ✘ ✘ ✔ Detachable Cable ✔ ✔ ✔ ✔ ✔ ✔ Balanced Cable Capability* ✔ ✔ ✔ ✔ ✔ ✔ Frequency Response 9 – 41,500 Hz 12 – 38,500 Hz 6 – 38,000 Hz 12 – 40,500 Hz 12 – 41,000 Hz 4 – 51,000 Hz (function(f) {var _np=(window.P._namespace("PremiumAplusModule"));if(_np.guardFatal){_np.guardFatal(f)(_np);}else{f(_np);}}(function(P) { P.when('premium-module-5-comparison-table-scroller', 'ready').execute(function(init){ init() }); }));
- Audiophile-Grade Open-Back Sound: These Sennheiser over the ear headphones provide a natural, high-fidelity sound with a spacious soundstage. The over the head HiFi headphones are great for immersive music experiences and long listening sessions
- Precise Highs & Deep Sub-Bass: Sennheiser open back headphones HD660S2 with ultra-light aluminum voice coil & 42mm transducers deliver detailed highs, rich mids, & deep, controlled bass. Overhead headphones are great for gamers, professionals, podcasters
- Powerful Low-End Performance: These wired over ear head phones let you feel every note from piano lows (27.5 Hz) to bass drums (45–60 Hz) with clarity and precision, whether it is for gaming sessions, listening to music, or for desktop use
- Exceptional Comfort: Open-back design with breathable, plush ear cushions ensures fatigueless listening during long sessions, making them audiophile headphones that have a comfortable fit and can work for music listeners or as gaming headsets
- Premium Build Quality: Sennheiser HD 660S2 audiophile headphones are crafted with expertly crafted materials in Germany & Ireland for durability, elegance, and long-lasting performance, making them head phones over ear for music lovers & music production
The 30-Second Version
The HD 660S2 brings best-in-class build quality and wonderfully natural sound that's a step above most in its bracket. But you'll need a good DAC/amp, and the narrow soundstage and abysmal mic hold it back. A fantastic buy at around $400-500 for serious listeners, but not a wise pickup if you want all-around versatility.
Overview
Look, the Sennheiser HD 660S2 isn't for the casual listener. These are open-back, wired headphones with a 300Ω impedance that practically demands a solid DAC/amp combo to wake them up. But if you've got the gear, they reward you with a natural, detailed sound that's among the best at this price when you hunt down a deal. They feel more like a precision tool than a plug-and-play accessory. And the pricing is all over the map, from $417 to a baffling $91,845 across vendors. So if you're patient and find them under $500, the value proposition shifts dramatically. Just know what you're signing up for: a stationary listening experience that doesn't travel well and falls apart for calls and gaming with friends.
Performance
The audio performance is where the HD 660S2 shines, landing in the 81st percentile overall. You get deep, controlled bass that reaches down to 9Hz on paper, and the mids deliver vocals with a lifelike presence that's genuinely arresting. The highs are precise without being harsh. But the soundstage, while spacious in an open-back sense, feels narrower than some expect for critical listening. It's not a wide, airy presentation, more intimate. Also, don't even think about the mic, it's a letdown at the 16th percentile, so calls are a no-go. You'll need a dedicated mic if you're streaming or chatting.
Pros & Cons
Pros
- Build quality is seriously impressive, 92nd percentile—these feel durable and premium. 92th
- Natural, detailed sound with warm bass and lifelike vocals that make instruments sound real. 81th
- Replaceable cables and ear pads mean these can last for years. 79th
- Plush, breathable pads keep you comfortable for hours once they break in. 66th
Cons
- Soundstage is noticeably narrow, which can make orchestral tracks feel cramped. 16th
- Plasticky finish on some parts doesn't scream $500, let alone the absurdly high prices. 31th
- Requires a good DAC/amp to sound their best, adding to the overall cost.
- Heavier than expected initially, and the clamp force takes getting used to.
The Word on the Street
Specifications
Full Specifications
Design
| Form Factor | over-ear |
| Open/Closed | open |
| Weight | 0.3 kg / 0.7 lbs |
| Ear Cushion | velour |
| Headband | Metal Headband w/Inner Damping |
Audio
| Driver Type | dynamic |
| Driver Size | 42 |
| Freq Min | 9 |
| Freq Max | 41500 |
| Impedance | 300 |
| Codecs | Sennheiser HD 660S2 - Audiophile Open-Back Over Ear Headphones with Deep Bass Extension and Refined Acoustic Performance, Over-Ear Headphones for PC, Music, Gaming, Podcasts, Premium Black |
Connectivity
| Wireless | No |
| Wired Connector | 3.5mm |
| Detachable Cable | Yes |
Microphone
| Microphone | No |
Features
| Gaming Mode | Yes |
Value & Pricing
Is it worth the money? That depends entirely on what you pay. The price spread is wild—$417 to over $91,000—which feels like a data glitch, but even at the real-world low end, you're competing with excellent alternatives. If you can scoop them up from a vendor offering a solid discount, the value is strong for a dedicated music and studio tool. But at full MSRP, the plasticky touches and narrow staging make it a tougher sell when you could snag something like a B&W Px8 S2 for wireless flexibility or even the Sennheiser HD 600 for a fraction of the cost.
Price History
vs Competition
Compared to wireless flagships like the Sony WH-1000XM6 or Bose QuietComfort Ultra, the HD 660S2 lives in a different world. Those are packed with ANC, Bluetooth, and mics for calls, while the 660S2 is a purist's wired headphone that demands a quiet room and a good amp. The Bowers & Wilkins Px8 S2 and Technics EAH-A800 also bring modern features and excellent sound for less hassle, but they can't match the raw, uncolored detail these open-backs provide when properly driven. If you're serious about sound and don't mind the wires, the Sennheisers are a standout, especially for studio monitoring where accuracy trumps convenience.
| Spec | Sennheiser HD 660S2 | Sony ULT WEAR WHULT900N/B | Technics EAH-A800 EAH-A800 | Audio-Technica ATH-S300BT ATH-S300BT | JBL Tune 770NC | Bose QuietComfort 884367-0100 |
|---|---|---|---|---|---|---|
| Form Factor | over-ear | over-ear | over-ear | over-ear | over-ear | over-ear |
| Driver Type | dynamic | dynamic | PEEK/Polyurethane 3-Layer Diaphragm | dynamic | Dynamic | Dynamic |
| Driver Size (mm) | 42 | 40 | 40 | 40 | 40 | - |
| Impedance Ohms | 300 | 314 | 34 | 45 | 32 | 32 |
| Wireless | false | true | true | true | true | true |
| Active Noise Cancellation | - | true | true | true | true | true |
| Open Closed Back | open | closed | closed | closed | closed | closed |
| Bluetooth Version | - | 5.2 | 5.2 | 5.1 | 5.3 | 5.1 |
| Battery Life Hours | - | 30 | 50 | 90 | 70 | 24 |
| Compare | Compare | Compare | Compare | Compare |
| Product | Anc | Mic | Build | Sound | Battery | Comfort | User Sentiment | Connectivity | Social Proof |
|---|---|---|---|---|---|---|---|---|---|
| Sennheiser HD 660S2 | 30.8 | 15.7 | 92.3 | 80.9 | 44.3 | 65.7 | 51.7 | 49.1 | 79 |
| Sony ULT WEAR WHULT900N/B Compare | 97.7 | 85.1 | 77.1 | 95.1 | 72.7 | 50.8 | 70.4 | 99 | 98.8 |
| Technics EAH-A800 EAH-A800 Compare | 92.5 | 98.3 | 77.1 | 96.9 | 83.8 | 50.8 | 19.9 | 93.1 | 98.8 |
| Audio-Technica ATH-S300BT ATH-S300BT Compare | 92.5 | 78.6 | 77.1 | 85.1 | 97.2 | 50.8 | 0 | 99.8 | 98.8 |
| JBL Tune 770NC Compare | 97.7 | 66.7 | 92.3 | 73.2 | 93.2 | 50.8 | 70.4 | 99.7 | 87.1 |
| Bose QuietComfort 884367-0100 Compare | 92.5 | 66.7 | 92.3 | 43.6 | 69.3 | 12.9 | 99.4 | 92.4 | 98.8 |
Common Questions
Q: Do I really need an amplifier for the HD 660S2?
Yes, with a 300Ω impedance, these headphones will sound thin and quiet without a proper DAC/amp. Pairing them with even a modest amp like the iFi Zen Can brings out the dynamics and bass they're known for.
Q: Are they good for gaming?
For immersive single-player games, the detailed sound is excellent, but the narrow soundstage and lack of a built-in mic make them a poor choice for competitive shooters or multiplayer. You'd need an external mic and an amp to get the best experience.
Q: How do they compare to the Sennheiser HD 600 or 650?
The HD 660S2 extends lower in the bass and has a slightly refined treble, but many users say the overall difference isn't massive. If you already own the older models, the upgrade might not feel worth it unless you crave deeper sub-bass.
Who Should Skip This
If you need headphones that can double as a gaming headset, handle phone calls, or block out airplane noise, skip these entirely. They're also a bad fit if you don't already own a decent headphone amp or aren't willing to buy one. And if you prize a huge, airy soundstage for classical or live recordings, the HD 660S2's narrower presentation might leave you disappointed. Look at the Beyerdynamic DT 1990 Pro or HiFiMan Sundara for wider staging in this price tier.
Verdict
These are for the audiophile who knows exactly what they're getting into: a high-impedance, open-back headphone that will sit on your desk tethered to an amp. If you're a musician, mixer, or just someone who loves picking apart a recording, the HD 660S2 delivers fantastic clarity and timbre. Casual listeners, gamers needing a headset, or anyone who wants ANC and portability should look elsewhere. They're a niche product that nails that niche.
