Noise control | Sound Isolation |
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Frequency response | 40500 Hz |
Sensitivity | 97 dB |
Headphones jack | 3.5 mm Jack |
Model name | Sennheiser HD 600 |
Connectivity technology | Wired |
Wireless communication technology | Wired |
Included components | HD 6, ¼” (6.3 mm) headphone adapter plug |
Age range (description) | Adult |
Material | Plastic, Metal |
Specific uses for product | Professional |
Recommended uses for product | Music |
Compatible devices | Compatible with any device of 3.5 mm jack |
Control type | Noise Control |
Cable feature | Without Cable |
Item weight | 9.1 Ounces |
Frequency range | 12 Hz - 40,500 Hz |
Package type | Standard Packaging |
Style | Headphones |
Product Dimensions | 1 x 1 x 1 cm; 257.98 g |
Item model number | 4465 |
Colour Name | Black |
Connector Type | 3.5mm Jack |
Material Type | Plastic, Metal |
Size | medium |
Color Screen | No |
Hardware Platform | PC |
Standing screen display size | 1 Inches |
Item Weight | 258 g |
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Sennheiser HD 600 Open Dynamic Hi-Fi Professional Stereo Headphones (Black)
Purchase options and add-ons
Brand | Sennheiser Consumer Audio |
Colour | Black |
Ear placement | Over Ear |
Form factor | On Ear |
Impedance | 300 Ohm |
About this item
- Lightweight aluminum voice coils ensure excellent transient response.Note : If the size of the earbud tips does not match the size of your ear canals or the headset is not worn properly in your ears, you may not obtain the correct sound qualities or call performance. Change the earbud tips to ones that fit more snugly in your ear.Specific uses for product : Professional
- Neodymium ferrous magnets maintain optimum sensitivity and excellent dynamics
- Sophisticated design, elegantly finished in black and gray
- High quality open metal mesh earpiece covers
- Detachable, Kevlar reinforced oxygen free copper cable with very low handling noise
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Product information
Technical Details
Additional Information
ASIN | B00004SY4H |
---|---|
Customer Reviews |
4.6 out of 5 stars |
鶹 Rank |
|
Date First Available | Feb. 22 2011 |
Manufacturer | Sennheiser |
Place of Business | SEATTLE, WA, 98101 US |
Feedback
Safety and product resources
Safety documents
Product description
With the HD 650, audiophiles will experience truly unique natural sound. With sound this good, long concerts in the comfort of your home are a certainty, so the HD 650 also sets standards in comfort and convenience. The HD 650 is a genuine masterpiece, which will satisfy even the most demanding listener. HD 650 the Reference Class.
Top Brand: Sennheiser
From the manufacturer

Sennheiser HD 600 Open Dynamic Hi-Fi Professional Stereo Headphones
These headphones are engineered for the true audiophile. Thanks to an open circumaural design, computer optimized magnets and aluminum voice coils.
Overview
The HD 600 are audiophile-quality, open dynamic hi-fi/professional stereo headphones. The advanced diaphragm design eliminates standing waves in the diaphragm material. The HD 600 can be connected directly to hi-fi systems of the highest quality, in particular DAT, DVD, MD and CD players. These headphones are an ideal choice for the professional recording engineer recording classical music.
Features
- Sophisticated design, elegantly finished in black and grey
- High-quality, open metal mesh earpiece covers for an extremely transparent sound
- Computer-optimised magnet systems minimise harmonic and intermodulation distortion
- Extremely lightweight aluminium voice coils ensure excellent transient response
- Neodymium ferrous magnet systems for optimum sensitivity and a wide dynamic range
- Exceptionally natural, spatial and accurate sound
- Detachable OFC copper cable, with very low handling noise
From the brand

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We are audio experts and music lovers who’ve been striving for the best audio experience. Through the craft and precision of German Engineering we create innovative products to reinvent the future of audio with remarkable audio experiences that you don’t just hear – but feel. That is what the Sennheiser brand has represented for more than 75 years.
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Intense Science
We are driven by the passion to create audio solutions that make a difference, by constantly rediscovering the needs of our customers.
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Intense Sound
Our ability to redefine sound has continued to set the norm, allowing music lovers worldwide to experience sound in a new dimension.
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Intense Emotion
As audio fanatics we strive for a remarkable sound you not only hear – but feel. We measure our success by the goosebumps on your skin.
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We invite you to discover our wide variety of premium audio products, which are divided into the following four categories: Premium Headphones, Audiophile Headphones, Hearing Solutions and Soundbars.
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Premium Headphones
Offering a wide selection of headphone styles from True Wireless to Over-Ear for premium music enjoyment no matter where you are.
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Audiophile Headphones
Continuously striving to define new industry standards with headphones for both home and mobile listening.
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Hearing Solutions
Seeking to provide market-leading enhanced hearing products from TV listening to situational hearing.
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Soundbars
Providing outstanding immersive sound experiences for home entertainment by a single device.
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Hear the Difference
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This Item ![]() Sennheiser HD 600 Open Dynamic Hi-Fi Professional Stereo Headphones (Black) | Recommendations | |||||
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Price | -34%$379.95$379.95 List: $579.95 | $94.99$94.99 | $371.46$371.46 | -30%$349.95$349.95 List: $499.95 | $129.00$129.00 | -18%$405.56$405.56 Was: $497.43 |
Delivery | Get it by Saturday, Jun 28 | Get it by Saturday, Jun 28 | — | Get it by Saturday, Jun 28 | Get it Jul 2 - 9 | Get it by Friday, Jul 4 |
Customer ratings | ||||||
Sold by | 鶹.ca | 鶹.ca | 鶹.ca | 鶹.ca | ELECTRONIQUE HI-FI INC | HIFIMAN |
connectivity tech | Wired | Wired | Wired | Wired | Wired | Wired |
headphones form factor | On Ear | Over Ear | Over Ear | Over Ear | Over Ear | Over Ear |
connector type | 3.5mm Jack | 3.5mm Jack | 3.5mm Jack | — | Auxiliary | 3.5mm Jack |
noise control | sound isolation | sound isolation | — | sound isolation | sound isolation | — |
headphones jack | 3.5 mm Jack | 3.5 mm Jack | 3.5 mm Jack | 3.5 mm Jack | 3.5 mm Jack | 3.5 mm Jack |
cable feature | Without Cable | Tangle Free | Detachable | Detachable | Basic | Detachable |
control type | Noise Control | Call Control | Media Control | Media Control | Noise Control | — |
water resistance | — | water resistant | not water resistant | not water resistant | not water resistant | not water resistant |
material | Metal, Plastic | Plastic | Aluminum Faux Leather Plastic | Plastic, Metal | Faux Leather | Metal |
model name | Sennheiser HD 600 | HD400S | Drop + Hifiman HE5XX | HD 620S | Sennheiser HD280PRO Headphone (new model) | Sundara |
frequency range | 12 Hz - 40,500 Hz | 18–20,000 Hz | 20 Hz - 40,000 Hz | 10 Hz - 42,000 Hz | 8 - 25000 Hz | 6 Hz to 75 kHz |
Brands in this category on 鶹
Customer reviews
Customers say
Customers like the sound quality, value for money, comfort, and build quality of the headphones. They mention the bass roll-off is not noticeable, and the stereo soundstage seems almost excessively wide. Customers also appreciate the longevity, sound balance, and space.
AI Generated from the text of customer reviews
Customers like the sound quality of the headphones. They mention it has an open, crystal-clear sound, and sounds much better than its price. Some say the bass roll-off is not noticeable, and the stereo soundstage seems almost excessively wide. They also say the tonal excellence and spatial depth are excellent.
"...These headphones stand out as a benchmark for neutral sound quality, and after a week of use, I can confidently say they are worth every penny for..." Read more
"...Briefly, I'd just say that the HD 600s have an open, crystal-clear sound...." Read more
"...I also feel like the HD600 also excels at anything with vocals in it which lends itself well to Trance or many forms of popular EDM with Dubstep and..." Read more
"...Instruments are separated and presented (not highlighted) in such startling clarity that, as many have commented, you'll swear you've picked up a..." Read more
Customers like the comfort of the headphones. They mention they're very comfortable, soft, and lightweight. Some say the clamp when new loosens to quite comfortable over time.
"...The lightweight plastic frame keeps them comfortable for long listening sessions, while the metal mesh earcups add durability and elegance...." Read more
"...On top of this, the HD 600s are the most comfortable headphones I've ever owned. Of course, your head may be different...." Read more
"...curly hair however once I cut it all off they definitely became fairly comfortable, more so than my M50's were at first and with time I expect them..." Read more
"..." type of headsets are not my cup of tea, and the clamping force on my head is too uncomfortable...." Read more
Customers like the value for money of the headphones. They mention they sound good for the price and are pretty damn cheap.
"...quality, and after a week of use, I can confidently say they are worth every penny for anyone who values accurate sound reproduction...." Read more
"...Yes, skeptics, there is a difference, and it is definitely worth the few extra dollars...." Read more
"...I feel like what I purchased is definitely worth it, the only thing I believe could be better is the cord." Read more
"...the same and can afford to save up, I dare say they're worth the somewhat exagerated price. With care, I think they'll last a very long time...." Read more
Customers are satisfied with the build quality of the headphones. They mention they're reliable, long-lasting, and reflect quality in their design and feel. Customers also mention the metal mesh earcups add durability and elegance. They also say the phones have been in continuous production for over 20 years and can be worn for extended periods with exceptional sound quality.
"...them comfortable for long listening sessions, while the metal mesh earcups add durability and elegance...." Read more
"...The HD600 feels sturdy, the color of it isn't as appealing as it'd be if Sennhesier decided to go with a simple black color scheme but I guess I do..." Read more
"Reliable. Pretty tough and very clear. They get more comfortable as you wear them in. Only negative is the long cable...." Read more
"...HD600 is not going to make you Mr or Ms Hip, but they look well-built and professional grade...." Read more
Customers like the weight of the headphones. They mention it's soft and rather lightweight.
"...The build quality is solid yet understated. The lightweight plastic frame keeps them comfortable for long listening sessions, while the metal mesh..." Read more
"...It's soft and rather lighweight but, coupled with the rather flimsy band and very slim frame, it certainly doesn't reflect what you'd expect out of..." Read more
"...years (they're a discontinued model now), and have always loved the light weight, perfect fit and great sound...." Read more
"...When I opened it up I was even more surprised to find a tiny (and very light) Sennheiser HD600 box...." Read more
Customers like the longevity of the headphones. They mention the open design reduces fatigue when listening for long periods, is ideal for relaxing listening, and lends itself well to Trance or many forms of popular EDM. Customers also say the soundstage is wide, creating an immersive effect, and the imaging is precise.
"...The soundstage is wide, creating an immersive effect, and the imaging is precise, making it easy to pinpoint each instrument's position in the..." Read more
"...the HD600 also excels at anything with vocals in it which lends itself well to Trance or many forms of popular EDM with Dubstep and other electronic..." Read more
"...also extremely laid back in everything and it could never annoy you for long listening periods...." Read more
"...(less bass) and open design, and as such, reduce the fatigue when listening for long periods...." Read more
Customers like the sound balance of the headphones. They mention they're nicely balanced with a gorgeous midrange and the drivers are balanced.
"...Unlike headphones with exaggerated bass or treble, these provide balanced and realistic sound...." Read more
"...The second pair also looked practically new but with balanced drivers! Hooray. BUT now the cable is no good and doesn't maintain connection. Sigh...." Read more
"...The HD600 is nicely balanced with a gorgeous midrange. It sounds much better than its price. An absolute bargain. I have also owned:..." Read more
"...has experience and has known for many years how to make exceptional balanced headphones, and this model is one of the best example...." Read more
Customers like the space of the headphones. They mention they scale spectacularly, the level of clarity and depth is simply uncanny, and the use of very wide cushions that fit well clear of the ears.
"...impresses right out of the box: the level of clarity and depth is simply uncanny...." Read more
"...One thing I've always appreciated with Sennheiser is their use of very wide cushions that fit well clear of your ears, and never press on anything..." Read more
"Great headphones; tonal excellence and spatial depth...." Read more
"...These sound very nice and I can tell they scale spectacularly because the difference from unbalanced to balanaced on the K7 is already huge...." Read more
Reviews with images

Good sound
Top reviews from Canada
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- Reviewed in Canada on January 17, 2025Verified PurchaseOverview:
The Sennheiser HD 600 headphones have completely transformed my listening experience. These headphones stand out as a benchmark for neutral sound quality, and after a week of use, I can confidently say they are worth every penny for anyone who values accurate sound reproduction.
Audio Quality:
The HD 600 delivers an exceptionally neutral sound signature, ideal for audiophiles and those looking for authentic audio. Unlike headphones with exaggerated bass or treble, these provide balanced and realistic sound. The midrange is where they truly shine: vocals, string instruments, and acoustic tracks come through with incredible detail. Listening to genres like classical, jazz, or even acoustic rock feels like being in a live studio session.
I tested these headphones with albums such as "The Last Resort" by Trentemøller, "We Are the Night" by The Chemical Brothers, "OK Computer" by Radiohead, "The Dark Side of the Moon" by Pink Floyd, Symphony No. 7 (Shostakovich), and Mozart’s "Requiem" (edited by Beyer). The headphones excelled in every genre, revealing every detail, including recording imperfections or artifacts that were previously inaudible. While all music sounds superb, these headphones truly shine with vocal and classical music. The soundstage is wide, creating an immersive effect, and the imaging is precise, making it easy to pinpoint each instrument's position in the mix.
These headphones perform especially well with a good amplifier/DAC due to their 300-ohm impedance. Directly connecting them to a PC or another source without a preamp will not allow them to reach their full potential. I paired them with the S.M.S.L DL100, which allowed them to fully reveal their potential, providing excellent clarity and dynamic sound.
Build Quality and Design:
The build quality is solid yet understated. The lightweight plastic frame keeps them comfortable for long listening sessions, while the metal mesh earcups add durability and elegance. However, the design might feel less “premium” compared to higher-end models like the HD 800.
Comfort:
Comfort is an area where the HD 600 excels over most other models. The velour earpads are soft and breathable, preventing discomfort during extended use. That said, users with larger heads or thick hair might find the clamping force slightly strong at first, but this eases over time as the headband adjusts. Compared to my previous headphones, such as the Audio-Technica M50x, the HD 600 causes significantly less ear fatigue, even during long listening sessions.
Who Are These For?
- Audiophiles who prioritize sound accuracy over bass-heavy tuning.
- Those who enjoy genres like classical, jazz, acoustic, and vocal-heavy music.
- Users willing to invest in a good DAC/amp to unlock their full potential.
If you prefer headphones with a bass emphasis or "fun" tuning, these might not be the best choice for you. However, for analytical listening, mixing, or simply enjoying music as the artist intended, these are near-perfect.
Value:
For their price, the HD 600 remains a gold standard in open-back headphones. While you can find cheaper options with decent sound quality, very few headphones in this range offer the same level of detail, balance, and longevity. Paired with the right setup, they can compete with much more expensive models.
Final Thoughts:
Would I recommend the Sennheiser HD 600 headphones? Absolutely. For anyone serious about sound quality, these headphones are a must-have. They’ve redefined how I listen to music and made me revisit my entire library with fresh ears. If you’re on the fence, know that this is an investment in audio that will last you for years to come.
- Reviewed in Canada on May 18, 2025Verified PurchaseWhen I fist got these headphones I did not have a dac at all and was using a very low quality streaming service that if i spotted before I would have change to the high service of a Tidal before and then I was floored by these headphones. ( I do not know how 鶹 is about mentioning other companies in reviews but they are both in the review just a little bit hidden)
- Reviewed in Canada on May 21, 2024Verified PurchaseAudiophiles tell me there are better headphones out there. I can't confirm this, though I may eventually strain the budget to find out. What's more important, I think, is that the classic Sennheiser HD 600s are the *worst* headphones you should ever bother with.
I've owned quite a few $100, $200 and $300 headphones, and I can say with great confidence that if I'd known what a quantum leap the HD 600s represented, I'd never have purchased anything less.
Yes, skeptics, there is a difference, and it is definitely worth the few extra dollars.
Life is too short to spend listening to music on inferior headphones. For travel, for gaming... sure, don't break the bank. But if you want to really enjoy your favorite music, don't short-change yourself. You'll be enjoying the HD 600s long after you'd have frittered the money away on something far less meaningful.
It's hard to be specific when describing sound quality without lapsing into metaphor. Briefly, I'd just say that the HD 600s have an open, crystal-clear sound. They give the impression that you're hearing the music as the musicians intended it, with nothing added or taken away. With the HD 600s, I'm hearing instrumentation I never knew was there. I'm delving deeper into the complexities of music I'd listened to for years.
On top of this, the HD 600s are the most comfortable headphones I've ever owned. Of course, your head may be different. And I have to mention that you will need a proper headphone amplifier, so figure an extra $100 or so for that. (I find it's worthwhile just for the extra control I get with the one I have plugged into my PC.)
Some listeners (not me) may wish for more bass - Sennheiser now has a couple of pricier headsets that promise to provide this. And of course you can spend four times more for headphones that claim they'll transport you to a whole other acoustic dimension. I haven't tried them. All I can say is even if, like me, you're not among the wealthy 1%, don't buy anything LESS than the HD 600s for listening to music. Skip the years I wasted listening to 'moderately priced' headphones, and go directly to the good stuff.
Top reviews from other countries
- Chopin LisztReviewed in the United Kingdom on April 22, 2019
5.0 out of 5 stars If you're even slightly OCD about sound itself, you need these
Verified PurchaseThese headphones made me cry. More on that later.
They come in a sturdy wood-ish type box - not posh polished wood, but sturdy enough and covered with dark brown lining. The phones are nestled in protective grey foam, cut to the shape of the phones to keep them safe during transit. A manual accompanies them, although I just dived in and started listening.
I love the sound of a piano so I had plenty of classical themed music to run through these 600s.
First up was an old Naxos 1980s Beethoven Piano Concerto No.1 CD. Hmm. The sound was dull across the entire range. The playing is fantastic though and led me to buy the sheet music, which I never could play. To be fair it never sounded great through any headphones, but I was expecting some kind of magic.
Let's try something recorded more recently. Second up was Yundi Li's "The Art of Yundi" (a fantastic collection of piano pieces - many new to me a few months ago). Flipping heck! What a difference a good recording/sound engineer makes! I heard nuances in individual notes I'd not heard before. I even heard accidentals/accent notes I'd not noticed before. The clarity from top to bottom was simply outstanding. Sparkling brilliance in the upper registers and warm dark sonorous tones lower down.
My love of piano music led me to buy an electric piano, 15+ years ago now. It went "pop" a year or so ago and died on me. I was sad but kept it as it's handy for my home theater speakers. When I've saved up I'll buy another.
Back to Yundi. Liszt's Rigoletto was one of the pieces that was new to me. I must have played it 100 times on the train to work, using my mobile + headphones. It's an addictive piece and I know it quite well now. Again there were notes/timbres/nuances that sprang into life, as though rescued from the cracks that lesser headphones would leave behind. It was like listening to a completely new recording. Rigoletto draws you in slowly, then makes you addicted with its clever ever complicating recapitulation, then exits the stadium with magnificent massive virtuoso chords crashing down the keyboard. And then silence. But there isn't. For a few seconds through these headphones you can hear the soundboard and frame of the piano ring and undulate as the brilliance of Liszt, through Yundis fingers, evapourates into the ether. That little piece of magic made me cry. It made me look at my beloved piano, now senza voce, and want to play it. But I could not, ever again. It made me remember all the good times, the bad times, the frustrations, the rare accomplishments but most of all my love of sound itself. Welcome back, my friend.
Let's not get too emotive - it's just a pair of headphones after all. However, music makes us emotional.
Third up was Bachs Toccata & Fugue in D Minor. These phones pick up everything, including quirks of an old air powered Church organ. You could almost hear the beast breathing through its nostrils. At full pelt in the "fff" passages with every single bank of notes from foot to teeth being tormented these phones did struggle. The music got lost as if overwhelmed. To be fair it's a cruel test as none of my headphones ever succeeded either. You have a huge Church organ pumping gallons of air to make those fat boy pipes play and expect a little piece of tech to replicate that? We need to be realistic in our expectations. However, the different registers/instruments the organ sounded were simply sublime through these. Really sweet.
Fourth up was a new addiction of mine. Liszt Hungarian Rhapsodies. Played by the brilliant George Cziffra. Recorded in the early 1970s I didn't expect much from this CD. In fact I was worried these 'phones might highlight the fact microphones were not as sensitive then, tape noise, that kind of thing. Oh my - what a blast! Yet again I'm hearing those accidental notes (not really accidental - they are very brief deliberate embellishments and fiendishly difficult to play without whacking). Yet again I feel like my ears have been cleansed or I'm listening to a new digitally remastered release. Brilliant.
These 'phones give your ears exactly what's on the plate. If it's a poor recording then they won't make it better. If it's a good one then your ears, brain, body and soul will be overjoyed. Yep that's the word. The music I have gave me joy. Now it's joy++. Overjoyed.
These initially feel tight to wear, but soon you realise you've gotten used to slack ill fitting headgear. They encompass the ear (unless you are Vulcan) and fit nicely against the head, instead of pressing into parts of the ear. I find them very comfortable. After a few minutes you forget you are wearing them.
My first pair of "opens". Highly recommended. Closed gives me that "sea shell" experience of hearing my own bloodstream or something. Plus my ears now remain cool, they weigh less and I feel part of the environment rather than in some sensory deprivation chamber. A huge plus when it comes to listening to a concerto where you want to be in the audience, not isolated.
Having listened to much piano tonight I noticed sound engineers don't follow any particular rule regarding left/right; some make you the listener - you are facing the piano being played so high notes come through the left ear and low notes through the right. Very disconcerting if you are a player. As the player you hear low through left and high through right. I'm not a player, but have tried and like to be "in the seat" when I'm doing air piano.
Others seem to give a cross-fade which is even more disconcerting.
For the wrong-way-round listener experience I found a fantastic tweak you can do to these HD 600s. If you absolutely want the player experience where low=down and high=up then make the following adjustments to these cans. Yes I know these are very expensive, but the modification is reversible:
1. Take them off
2. Put them on the wrong way round
Immediately you are transported from audience to player. As these phones are symmetrically flexible they feel just as comfortable either way around.
Worth the money? If you're going to do something, do it once and do it properly.
With a frequency response of 12Hz-40500Hz it should cover most needs. Oh nearly forgot! So many questions out there about impedance. 32/80/300/600 Ohms. Will my X phones work in a Y thing? There's lots of "info" about needing to buy a specialist headphone amp if > 32 ohms.
These HD 600s are 300 ohms. I have them plugged into my Denon 4300 AVR. My CD is a Panasonic Blue Ray player. They are more than loud enough at 5/10. 3/10 would be my listening preference.
These just tell it like it is to be fair. No magic. No pseudo science. Simple transparent acoustic honesty.
No regrets at all.
3 people found this helpfulReport -
Squire ManReviewed in France on January 8, 2015
5.0 out of 5 stars Top niveau.... un "must buy" comme on dit...
Verified PurchaseJe réfléchissais depuis quelques temps pour renouveler mon casque Sennheiser HD265 Linear et je tombe à 8h00 du matin, hier , au démarrage des soldes, sur ce modèle soldé à 135 Euro au lieu de 327.
Bien sur je me dépêche d'en commander un, à 8h30 y en avait plus..
Voilà, en ce moment je l'ai sur la tête et je savoure le son qui m'emplit les oreilles..
Pas la peine de disserter, ce casque est exceptionnel, et ce n'est pas pour rien si il a été produit pendant plus de 10ans, c'est un "winner" comme on dit et il a souvent été comparé avec des casques à 600 euros.
C'est mon 5ème casque de la marque Sennheiser, depuis 30a. Avant lui j'avais opté pour un HD265 Linear, casque fermé, pour avoir plus de pression sonore, car les casques ouverts, chers à la marque,avaient tendance à manquer de patate...
Avec le HD600 il n'en est rien et le son est très confortable et très détaillé.
Je viens d'écouter l'album "All'n All" d'Earth Wind & Fire que je connais par coeur et j'ai découvert un petit contrepoint à la clarinette, que je n'avais jamais remarqué, dans le morceau "Serpentine Fire".
Ce casque est hyper précis et très musical.
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Jonatan PadilhaReviewed in Brazil on April 4, 2025
5.0 out of 5 stars Ótima Qualidade Sonora e Conforto
Verified PurchaseO HD600 me surpreendeu positivamente. O som é extremamente natural e equilibrado, com médios ricos e detalhados que fazem qualquer vocal ou instrumento acústico ganhar vida. A construção é sólida e o acabamento transmite qualidade, com uma leveza que garante conforto mesmo em longas sessões. Combinado com o meu SMSL DL100, entrega um palco sonoro bem definido e uma apresentação fiel, sem exageros. Um fone que realmente mostra por que é um clássico.
- KatunReviewed in the United States on May 27, 2025
5.0 out of 5 stars HD6XX vs HD600 vs HD660s2 | Comparison & Review
Verified PurchaseIf you are reading this, chances are you’re stuck in the exact same predicament that many of us find ourselves in at some point, including myself recently. Which HD6** series headphone would suit me best? Despite reading hundreds of forum posts, analyzing dozens of squiggling graphs, and scouring in-depth reviews for that potential “ah-ha!” moment that would convince me one way or another, I still found myself going in endless circles deciding on what to get. I started with the HD6XX due to its ridiculously good price when on sale ($179). With how impressed I was with it on my xDuoo TA-66, I just knew I had to try the others. Naturally, nothing in audio ever seems good enough, and once again I succumbed to the curiosity that something “better” was right around the corner. And now we’re here.
The only real difference between the three as far as “what's included” are the cables. HD6XX has a 4.5ft terminated into 1/8th (with adapter), HD600 has a 9ft into a 1/8th (with adapter), and the HD660s2 has two 6ft into a 1/4th and 4.4. HD600’s cable is the thinnest and most flexible, but both the cable and connectors are quite a bit smaller and don’t seem as durable. Other than the extra cable the HD660s2 includes, it also comes wrapped in a microfiber bag instead of a plastic bag like the others (must be where all that extra cost comes in). Jokes aside, physically all headphones are nearly the same with slight variations in frames, color, and swivel. HD660s2 and HD600 have flatter earcup frames whereas the HD6XX is more rounded. The HD6XX also has slightly less swivel range but is less creaky, whereas the HD600 and HD660s2 had a bit more swivel but there was more of an audible rattle when handling or setting down the headphones. Very minor and in no way a flaw, just something I noticed.
A word on amplification and gear. I'm using the Topping DX5 as the DAC (sometimes with the headphone out) and the xDuoo TA-66 OTL tube amp. In conjunction with the stock tubes, I’m also testing RCA 6AS7G and 6080 for the rear, and Gold Lion 12AX7 (with adapter) and Voskhod 6N2P-EV for the front. Some combinations I’ve definitely liked more than others, but the stock tubes are FINE! Having owned the HD600 and HD650 many times in the past and heard them on a variety of equipment, after hearing them on the TA-66 I can confidently say these Sennheiser’s really DO need tubes to sound their best. And for $250, I simply cannot recommend the TA-66 enough. I do believe an OTL tube amp is essential for any of these headphones as the sound changes/gains are quite obvious. Match made in heaven.
So the adventure began with the HD6XX and the TA-66. I was so overjoyed with this combo and quite honestly, I’ve never heard the HD6XX/HD650 sound this good! My favorite combo was the RCA 6080 and the Gold Lion 12AX7, both waking up the HD6XX and injecting it with more energy. However I was NOT a fan of the RCA 6AS7G as it made them sound really mushy and strained. With how much I was enjoying the HD6XX this time around, I knew I had to get the HD600 once more, having preferred it to the HD650 in the past. To my surprise, I didn’t necessarily… like it more? While the slightly more neutral sound signature was nice for some things, the HD6XX had a more pleasing and likeable tone. The HD600 could sometimes sound a tad thin in comparison. Honestly, both were so close and kept trading blows to the point where I couldn’t choose between them. Thus, the tie breaker is price. HD6XX takes it.
Next up, the HD660s2. Having never heard these (or the originals), I wasn’t sure what to expect. I went into it fully hoping that they would be a clear winner with their “extended bass” and other tweaks. I had to do a bit of mental gymnastics to get past the price in comparison to the others ($399 on sale), but I told myself that if they were the tiebreaker and I generally preferred them to the other two that I’d keep them despite representing the worst value of the three. Immediately upon first listen, I did NOT like them! What was this? Bloated bass, darker sound than the HD6XX, a slightly wonky tone, and no noticeable technical improvement in any other area? I was beside myself. This is Sennheiser’s latest and greatest HD6** headphone? First thing that came to mind was the HD700 with Dekoni pads. Was not a fan of those either for the same reason, but at least those were more comfortable and had a larger soundstage. Bass is what you notice first and foremost, and it distracts you from the magic mids. All things considered, the bass isn’t great either. Don’t be fooled into thinking this is a HD600 or HD6XX with “deep bass”. If you want headphones with deep bass, you’d be better off choosing planars or closed-backs.
Another way of putting this is to think of the neutral reference HD600 as a “0” on a scale representing its level of bass, treble and sound signature with each sequential number decreasing treble, increasing bass, and sounding warmer. The HD6XX would slot in as a “1”, a little less treble, a little more bass, a little warmer. HD660s2 would then be a “3” as I think the difference from the HD6XX to HD660s2 is larger than the HD600 to HD6XX. The DT880 would probably be a “-1” on this scale, being colder and brighter sounding. Honestly, after following up listening to the HD660s2 with the HD6XX, the HD6XX sounds like it should be the HD660s3, because it “fixes” the flaws I had with the HD660s2. I just don’t get it. HD6XX and HD600 are clearly sidegrades to each other, whereas the HD660s2 is a downgrade in my opinion.
Focusing on just the HD600 and HD6XX, these are some of my favorite headphones of all time. Their glorious midrange is still unmatched and I have yet to find a headphone with better tone or timbre. The only other headphone I can recall liking more overall is the HE1000 Stealth. Despite my preference for light bass (I use Magnepan LRS+ with no subs for example and LOVE them), I actually lean more toward the HD6XX than the HD600 which surprised me. I think the HD6XX synergies with tubes a bit more and the sound seems just a little smoother, more cohesive, and more weighty. I think the HD600 is objectively the better headphone, with the HD6XX being subjectively the better one. My brain says HD600, but my heart says HD6XX. Again, very minor differences between them and both are incredible headphones, but the HD6XX is unequivocally the no-brainer simply because of its price. On solid state amps, I find this series can be too mellow, uninvolving, or restrained, but tubes really capitalize on their strengths and are the key to unlocking their full potential.
Let’s recap real quick and see the current standing. So we have the HD6XX around $200, the HD600 around $300, and the HD660s2 around $400. The HD6XX and HD600 are too close to call making the extra $100+ not seem like a good investment, yet here we have the HD660s2 which is unquestionably in 3rd place… yet they are DOUBLE the price of the HD6XX? Absolutely not. At the current pricing structure, quite frankly, the HD660s2 is a joke. Do I think the HD600 and HD6XX are $300 headphones? Absolutely. How about the HD660s2? No way. I think they sound like a $200 headphone at best, but based on the HD6XX’s price, I personally would not pay more than $150 for them. By the same token, I also do not think the HD600 is worth $300+ considering the market disruptor HD6XX can be had for $179 or $199.
That being said, I don’t think the HD660s2 is a bad headphone. In fact, I still did enjoy it once I got used to it. No doubt its flavor would appeal to some over the HD6XX or HD600 in direct comparison, but I emphasize “direct comparison”. Because at the end of the day, I can’t stress enough just how similar all three of these headphones sound and to just buy whatever is cheapest or most available to you. Case in point, of the many hours I was comparing these three, I can’t tell you how many times I would lose track and literally forget which of them was on my head, only to be blindsided when I pulled them off thinking it was one of the others. This really proved to me that once I started listening, the finer details and small tuning differences faded into obscurity and I was then just listening to a “Sennheiser” headphone.
Wrapping up, the biggest discrepancy with this trio of headphones is undoubtedly price and value. So what do I recommend? If you don’t own any of these headphones, get the HD6XX when it's $179, a TA-66 for $249, have some fun rolling tubes, and enjoy the music! The tube swaps provided a bigger sound quality change than switching between any of these headphones and for a whole lot cheaper! And if you already own one of these headphones and are tempted to purchase one of the others hoping for an upgrade or just a different flavor, don’t bother… you only need one HD6** headphone.
Famous last words: “you only need one”.
KatunHD6XX vs HD600 vs HD660s2 | Comparison & Review
Reviewed in the United States on May 27, 2025
The only real difference between the three as far as “what's included” are the cables. HD6XX has a 4.5ft terminated into 1/8th (with adapter), HD600 has a 9ft into a 1/8th (with adapter), and the HD660s2 has two 6ft into a 1/4th and 4.4. HD600’s cable is the thinnest and most flexible, but both the cable and connectors are quite a bit smaller and don’t seem as durable. Other than the extra cable the HD660s2 includes, it also comes wrapped in a microfiber bag instead of a plastic bag like the others (must be where all that extra cost comes in). Jokes aside, physically all headphones are nearly the same with slight variations in frames, color, and swivel. HD660s2 and HD600 have flatter earcup frames whereas the HD6XX is more rounded. The HD6XX also has slightly less swivel range but is less creaky, whereas the HD600 and HD660s2 had a bit more swivel but there was more of an audible rattle when handling or setting down the headphones. Very minor and in no way a flaw, just something I noticed.
A word on amplification and gear. I'm using the Topping DX5 as the DAC (sometimes with the headphone out) and the xDuoo TA-66 OTL tube amp. In conjunction with the stock tubes, I’m also testing RCA 6AS7G and 6080 for the rear, and Gold Lion 12AX7 (with adapter) and Voskhod 6N2P-EV for the front. Some combinations I’ve definitely liked more than others, but the stock tubes are FINE! Having owned the HD600 and HD650 many times in the past and heard them on a variety of equipment, after hearing them on the TA-66 I can confidently say these Sennheiser’s really DO need tubes to sound their best. And for $250, I simply cannot recommend the TA-66 enough. I do believe an OTL tube amp is essential for any of these headphones as the sound changes/gains are quite obvious. Match made in heaven.
So the adventure began with the HD6XX and the TA-66. I was so overjoyed with this combo and quite honestly, I’ve never heard the HD6XX/HD650 sound this good! My favorite combo was the RCA 6080 and the Gold Lion 12AX7, both waking up the HD6XX and injecting it with more energy. However I was NOT a fan of the RCA 6AS7G as it made them sound really mushy and strained. With how much I was enjoying the HD6XX this time around, I knew I had to get the HD600 once more, having preferred it to the HD650 in the past. To my surprise, I didn’t necessarily… like it more? While the slightly more neutral sound signature was nice for some things, the HD6XX had a more pleasing and likeable tone. The HD600 could sometimes sound a tad thin in comparison. Honestly, both were so close and kept trading blows to the point where I couldn’t choose between them. Thus, the tie breaker is price. HD6XX takes it.
Next up, the HD660s2. Having never heard these (or the originals), I wasn’t sure what to expect. I went into it fully hoping that they would be a clear winner with their “extended bass” and other tweaks. I had to do a bit of mental gymnastics to get past the price in comparison to the others ($399 on sale), but I told myself that if they were the tiebreaker and I generally preferred them to the other two that I’d keep them despite representing the worst value of the three. Immediately upon first listen, I did NOT like them! What was this? Bloated bass, darker sound than the HD6XX, a slightly wonky tone, and no noticeable technical improvement in any other area? I was beside myself. This is Sennheiser’s latest and greatest HD6** headphone? First thing that came to mind was the HD700 with Dekoni pads. Was not a fan of those either for the same reason, but at least those were more comfortable and had a larger soundstage. Bass is what you notice first and foremost, and it distracts you from the magic mids. All things considered, the bass isn’t great either. Don’t be fooled into thinking this is a HD600 or HD6XX with “deep bass”. If you want headphones with deep bass, you’d be better off choosing planars or closed-backs.
Another way of putting this is to think of the neutral reference HD600 as a “0” on a scale representing its level of bass, treble and sound signature with each sequential number decreasing treble, increasing bass, and sounding warmer. The HD6XX would slot in as a “1”, a little less treble, a little more bass, a little warmer. HD660s2 would then be a “3” as I think the difference from the HD6XX to HD660s2 is larger than the HD600 to HD6XX. The DT880 would probably be a “-1” on this scale, being colder and brighter sounding. Honestly, after following up listening to the HD660s2 with the HD6XX, the HD6XX sounds like it should be the HD660s3, because it “fixes” the flaws I had with the HD660s2. I just don’t get it. HD6XX and HD600 are clearly sidegrades to each other, whereas the HD660s2 is a downgrade in my opinion.
Focusing on just the HD600 and HD6XX, these are some of my favorite headphones of all time. Their glorious midrange is still unmatched and I have yet to find a headphone with better tone or timbre. The only other headphone I can recall liking more overall is the HE1000 Stealth. Despite my preference for light bass (I use Magnepan LRS+ with no subs for example and LOVE them), I actually lean more toward the HD6XX than the HD600 which surprised me. I think the HD6XX synergies with tubes a bit more and the sound seems just a little smoother, more cohesive, and more weighty. I think the HD600 is objectively the better headphone, with the HD6XX being subjectively the better one. My brain says HD600, but my heart says HD6XX. Again, very minor differences between them and both are incredible headphones, but the HD6XX is unequivocally the no-brainer simply because of its price. On solid state amps, I find this series can be too mellow, uninvolving, or restrained, but tubes really capitalize on their strengths and are the key to unlocking their full potential.
Let’s recap real quick and see the current standing. So we have the HD6XX around $200, the HD600 around $300, and the HD660s2 around $400. The HD6XX and HD600 are too close to call making the extra $100+ not seem like a good investment, yet here we have the HD660s2 which is unquestionably in 3rd place… yet they are DOUBLE the price of the HD6XX? Absolutely not. At the current pricing structure, quite frankly, the HD660s2 is a joke. Do I think the HD600 and HD6XX are $300 headphones? Absolutely. How about the HD660s2? No way. I think they sound like a $200 headphone at best, but based on the HD6XX’s price, I personally would not pay more than $150 for them. By the same token, I also do not think the HD600 is worth $300+ considering the market disruptor HD6XX can be had for $179 or $199.
That being said, I don’t think the HD660s2 is a bad headphone. In fact, I still did enjoy it once I got used to it. No doubt its flavor would appeal to some over the HD6XX or HD600 in direct comparison, but I emphasize “direct comparison”. Because at the end of the day, I can’t stress enough just how similar all three of these headphones sound and to just buy whatever is cheapest or most available to you. Case in point, of the many hours I was comparing these three, I can’t tell you how many times I would lose track and literally forget which of them was on my head, only to be blindsided when I pulled them off thinking it was one of the others. This really proved to me that once I started listening, the finer details and small tuning differences faded into obscurity and I was then just listening to a “Sennheiser” headphone.
Wrapping up, the biggest discrepancy with this trio of headphones is undoubtedly price and value. So what do I recommend? If you don’t own any of these headphones, get the HD6XX when it's $179, a TA-66 for $249, have some fun rolling tubes, and enjoy the music! The tube swaps provided a bigger sound quality change than switching between any of these headphones and for a whole lot cheaper! And if you already own one of these headphones and are tempted to purchase one of the others hoping for an upgrade or just a different flavor, don’t bother… you only need one HD6** headphone.
Famous last words: “you only need one”.
Images in this review