First Pair of Open Back Headphones

Clear sound and plenty of power when paired with my Zen ifi DAC and desktop. After a couple hours some hearing fatigue will set in but maybe that's unavoidable.

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Nice alternative to the mainstream wireless

Nice set of mid priced wired headphones

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Wonderful

These were my introduction to HiRez listening. Listening through ifi HipDAC and Qobuz. The sound is remarkable. Take the time to break them in. Thirty plus hours in and the sound keeps improving. They sound flat at first and if you are not used to high end sound your ears may need time to break in as well. Mine did. I purchased open box and could not be happier.

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Sennheiser HD 660 S

Just got these after a pretty quick browse through Crutchfield's audiophile headphones section. Sale price was unbeatable, and I couldn't pass up the open box discount. I got these mainly to listen to records via a Marantz PM6006 amp. They sound very nice in this setup. The velvety ear cups are indeed very comfortable.

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Joy

Excellent choice. Purchased primarily to enjoy vinyl records. Allows me to enjoy music with extreme clarity and depth with a smooth and not "muddy" base. Additionally, can wear long periods of time without experiencing fatigue

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Sennheiser HD 660 S

Good quality headphone for the price. Not a ton of bass, but acceptable.

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in a Class all their own

Very comfortable headphones. Great clarity of sounds and truly worth much more than I paid.

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Great advice lead to a satisfying purchase

I was excited to get this first pair of wired headphones after having only wireless models in the past. There were so many to choose from, but the content and reviews on Crutchfield were incredibly helpful in helping me decide at what price point to enter and what the best choices were. I'm very pleased with the Sennheiser HD 660S purchase as this seems to have been a tried and proven model with many favorable reviews and a strong product legacy, and so far so good. Now looking at headphone amps to jack up the experience to the next level.

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Sennheiser HD 660 S

Sound is incredible. Clamping force is real. Glasses wearer. Imagine will loosen over time. Better without glasses but still squeezes the melon.

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German

Built in Germany, it is robust. It is also comfortable for me. Very long break-in time. It's been about 100 hours now, but the mids and highs are clear, but the bass is too heavy. I'm looking forward to finishing the break-in.

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Love the 660S

Amazing clarity and full sound, especially in the lower frequencies that are a tight reproduction below 250 hz. Very comfortable.

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Superb Soundstage

Excellent upgrade to my current wired headphones. Spacious sound, though the the bass is slightly less than my preference. Must use with Dragonfly Black DAC.

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Sennheiser HD 660 S

Best Buy ever!

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Sennheiser HD 660 S

My first set off head phones in several years and I'm amazed at the quality of the sound. I got them so I could start listening to my vinyl collection again and I'm hearing detail that I never heard before.

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Music from a new perspective

I was a luck warm fan of David Bowie. When I pulled up his Space Oddity music on my new Bluesound Powernode and listened through my new Sennheiser headphones I was simply blown away by all the detail David worked into his music. These headphones are helping me explore music from a whole new perspective. Tony thank you soooo much for your advice.

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Sennheiser HD 660 S

Great set of hp's! Seriously consider them

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Try them out before you buy them

I have the Sennheiser 590 that I bought over 20 years ago and they sound better than the Sennheiser HD 660 S. If I had tried them out before I bought them, I would not have bought them.

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Great Headphones, Just not for me.

This review is purely subjective, these headphones have a great sound to them, I just do not prefer it. I was running this off of a IFI dac v2. For my personal taste the highs seem veiled, and the low end, particularly mid and sub bass is lacking. Again this is subjective, as I mostly listen to rock, rap, electronic, and soundtracks with lots of dynamics and bass which usually cross through all three of those genres. So the intensity on the high and low end is simply not there for me. Moving on the comfort, which is again subjective, my ears tend to overheat with large cans pretty quickly, so these became uncomfortable after about 1-1.5 hours, the clamping force isn't bad on these no complaints other than the heat which is nothing to do with these headphones specifically I have ordered a set of iem 600's as I have been reading they have more of a "V" Shaped sound signature which is more to my taste, as well as not having the ear temp problems of the large headphones. I am still giving these headphones 5 stars because my gripes are all personal preference.

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Really good Headphones.

These Headphones with amp/dac inline, plus proper Hi-Res streaming service= Really good sound upgrade. Only disappointment is brightness of sound could be better. I don't know if brightness could be improved with higher end amp/dac, or if it is the limitations of the headphones.

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Love the Sennheiser HD660s

These compare closely with an older pair of HD600 that I own. Both are fabulous. Comfortable, great neutral sound, revealing but not obnoxious. A classic. The HD660s includes both 1/4" unbalanced and 4.4mm balanced cables -- nice. The 1/4" to 3.5mm adapter is a bit clunky but does the job. The cord is long but rarely tangles. It's an open-backed phone -- perhaps this is a big reason why these phones sound like magic -- so it doesn't isolate room noises and would be a dreadful choice for airplane listening. The HD660s were on sale, and I bought an open box unit, which made this purchase an emphatic no-brainer.

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Sennheiser HD 660 S

The Sennheiser HD 660 S is a great headset for the price. The sound is clear and crisp. The headset fits well and is comfortable to wear for an extended period of time.

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Great Sound and Comfortable For As Long As You Want

Very Comfortable and accurate. While my hearing has diminished with time, I can readily appreciate the improvement in sound quality and comfort over the Sony MDR phones I have used for many years. It's amazing how beautiful these sound from such relatively small drivers right next to my ears. I don't believe that I am missing anything!

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Sennheiser HD 660 S

Use them for listening to classical music. It's the next best thing to being in a great concert hall.

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SUPREME offer.

Own several older pairs of Sennheiser headphones: 580, *590; (*not same quality as the 580/600), 600, always wanted the 650 pair when first released almost 20 years ago. Am VERY satisfied. THANK YOU ALL, and for the deal. Bee.

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Sennheiser HD 660 S

I bought these to be a more comfortable alternative to my Grado SR325e headphones, and the 660S phones certainly succeed in that regard. They are lightweight, very well padded around the ears and across the scalp, plus beautifully built and finished to boot. Their comfort is absolutely first-rate. Unfortunately, they delivered a sound quality that was just too dark and laid-back for my tastes, very similar to that attributed to their HD650 and HD6XX sister models. The Grados are far from perfect, but they deliver a level of detail and musical involvement I just didn't experience with the 660S. As usual, Crutchfield customer service was superb, making the return process so simple and convenient.

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Sennheiser HD 660 S

Fantastic sound and very comfortable.. blows away my Grado 325!

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Sennheiser HD 660 S

Soundstage is important to me and these seemed to have none. After only 2 of my favorite songs I knew I was going to return them. It's not that they didn't sound good, because the dead. However, the music felt like it was all in my head and nothing around me.

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Sennheiser HD 660 S

I bought these to upgrade my Sennheiser HD280 Pro headphones that I've had for a few years. They really aren't much of an upgrade. Sound might be a little bit clearer, but worth the money I spent clearer. And they are no where near as comfortable as the 280 Pros. I put them on and they feel OK, but very rigid (not much flexibility) and the ear cups are not soft. Then I put on the 280 Pros and the ear cups are so much more comfortable and the overall adjustments are much better. I've Only had the 660s a few days. I haven't decided if I will keep them or not.

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Sennheiser HD 660 S

Nice, good all around head phones

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Sennheiser 660s

I ordered the Sennheiser 660s about three months ago based on prior experience with Sennheiser phones, and I am very pleased with it. It's sounds good, clear and detailed. it's very comfortable, and it's easily driven by my MacBook Air (M1, 2020) as well as a couple of headphone amps that tried with it: Cambridge DACMagic200 and Schiit Audio Asgard 3. IMO, the 660s doesn't NEED a headphone amp when used with my laptop's 3.5mm headphone connector, nor does it seem to benefit from one at the lower volume levels that I prefer. It also doesn't seem to need a headphone amp when connected to the 3.5mm headphone output of my older iPadPro. So far, I haven't found the right combination of cables and connectors to listen to music from the Lightening connectors on my iPhone and iPadPro, so perhaps a headphone amp is needed or beneficial with these devices and ports. My only original concern was the $500 list price that seemed about $100 high compared to the competition from other brands. Within few weeks, Crutchfield put the 660s on sale for $400, and at my request, refunded $100 to me under their price drop guarantee with no quibbling.

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Great high end sound and comfort

Waited for these to go on sale after trying them at a friend's apartment. They are incredible sounding and very comfortable even through multiple consecutive LP listenings.

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Very pleased!

Wanted to try an open back headphone and after researching and watching reviews, I decided to go with these 660s's. There are many very good headphones in the $300-$700 range. These are right in the middle of that pricing. I'm very happy with my pick! The only fault would be, (and it's small), that the bass isn't a strong point. That is to be somewhat expected though with this style headphone and I knew that going in. I'm fine with that, but if you want more bass, you should probably look to spend more money, go with a closed back headphone, or both. Aftermarket cables might be something to look at as well. Enough on that. The overall presentation, spacious, definition, clarity, fit, comfort, and if you like acoustic music and vocals, you'll be hard pressed to do better than these without spending $200-$300 more in my opinion. I have listened to headphones in the $1000 range and it can be hard to pick. What type music do you want them for? Diminishing returns the farther up the pay scale you go, (as with most hifi equipment), so not necessarily better sound, but different! If these fall within your budget, I feel very comfortable suggesting the Sennheiser HD 660s for you to take a look at. Crutchfield has been awesome to deal with also!!!

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Excellent open backed headphones

Excellent audio quality from these headphones and I can't be happier. Very comfortable to wear and I can wear them for hours without my ears sweating.. I paired them with a Cambridge Audio DacMagic 200M and streaming Apple Music or locally sourced iTunes and altered the standard Windows audio driver for higher quality output (384k). Value for money is subjective. I probably would have been equally happy with the step-down model but if I am going to buy a pair of headphones that I will keep for 10+ years, I don't mind the splurge. Besides at my age (mid-50s), I think the more expensive $2k+ options would be wasted on me and my audio listening capabilities.

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Sennheiser HD 660 S

I upgraded from the Bose wireless headphones. These Sennheiser HD 660 S are very good headphones for price. I listen through NAD integrated amp with BluOS and makes everything sound better. Also, I upgraded to a audiophile headphone cable. They are a little heavier than the Bose but I can still wear them for extended periods of time.

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audiophile

Allow me to hear every piano key of a sonata, or my favorite Blondie song. My 68 year old ears are happy; they overcome my hearing loss.

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Sennheiser HD 660 S

My order was delivered free of charge and arrived on the day specified. Thanks ??

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Price and performance sweet spot

To me, these are a sweet spot for price and performance. They are well built, super comfortable to the point where one almost forgets they are being worn. From a performance stand point, they are very accurate and pleasing to my ears. As open back they don't isolate you from the room, a plus in my mind. The sound stage seems slightly narrow, but that may change as they wear in, and deep room shaking base isn't gonna happen with open backs. I love the fact that you can change ear pads yourself. These sound way better than my QC 25s.

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Great job Sennheiser

Put on Steely Dan , Hey Nineteen to see how they sounded and 4 to 5 hours later with all types of music I knew these were an excellent choice. I will say if your audio source is really poor than don't use these. Also very comfortable. I have never been able to wear headphones for more than an hour or two without taking a break, but these , no problem.

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Sound Buy

Currently my best sounding headphones I own/use. I have one other can (Bose QC2), and numerous earbuds (Bose noise cancelling and Sennheiser Momentum). thoroughly enjoy listening to these head phones. My other (cans or buds) do not compare in stage imaging or reproduction clarity of instruments. The others seem factory tuned with excessive bass and lower mid range frequencies that muddy the upper mid and hi frequencies. With these, bass is just right - what I believe would sound like on stage, or in studio. Note, none of my earbuds match these cans, and I don't think any on the market will. Buds are great for mobility, while these cans are great for stationary critical listening. Use - Paired with Pioneer SA 6500 integrated amp, and iFi Audio Zen Can (SE) for nighttime listening. Pros - great sound stage, sound reproduction and clarity. Comfortable. Con - really none. Not ideal for travel - I believe not the HD 660s intended market. Cost may prevent some from considering. Open back not good for bedroom and spouse's sleeping. Last thought, I believe very few will regret buying and using these head phones. My comparison analogy, like getting a car with the premium sound versus the base package. These are the premium. Because I'm am carrying between rooms and amps, looking at buying some closed back cans for the bedroom. More to follow.

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Excellent Sounding

I ? these Headphones. I wear a behind the ear hearing aid and there is NO feedback with these headphones. I use these to listen to music, do Zoom Meetings on my laptop and talk on my mobile phone. The sound is great!! I can hear music(Good Bass) and voices perfectly crisp and clear. These headphones are definitely worth the price.

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Jeff

Best headphones I have ever had, excellent sound quality!

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Sennheiser HD 660 S

Very nice sounding headphones, great for late night listening, moderately comfortable. Better for me than sundara, which I may return. My wife also really enjoys. She listens in bedroom with ifi zen stackk

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Sennheiser HD 660 S

Excellent sound quality. Good base response and good mids and highs. Plays very well with an ifi hip dac. It needs to have a short cable and a long cable. Possibly the best headphones I have ever purchased.

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Sennheiser HD 660 S

These headphones sound great out of the box and I can't wait for them to sound a little better after a brief burn-in period. These are my first audiophile cans upgrading from Bose. I have found them to be very comfortable and enjoy them very much while listening to my Marantz ND8006 network player. The sound is clean, crisp and stays true to the original recordings across the board.

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Great Cans!

I listen to predominantly Classical and Jazz. Connected to a Dragonfly Black, these sound great. The Dragonfly powers them great. An amazing soundstage. Like you're sitting in a room with big speakers.

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Sennheiser HD 660 S

Nice headphone I like it !!

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Sennheiser HD 660 S

Probably good headphones for most people . I have an Auruvana Trio In Ear headphones that cost 100 dollars and a dragonfly black as reference. I bought the 660s along with the Cobalt dragonfly and was greatly disappointed . I figured a 800.00 system would sound better than a 200.00 system and I was wrong. Crutchfield service and return was excellent.

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Sennheiser HD 660 S

My only regret with these headphones is waiting as long as I did to buy them. For me they are an upgrade from Sennheiser HD 598's. The difference is striking -- much more detail and surprisingly strong but not overpowering bass.

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Sennheiser HD 660 S

I love them! I wear behind the ear hearing aids and have always had a problem with feedback. Not anymore, they fit perfectly over the hearing aids and I hear music like never before.

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Excellent Headphones

Paired with a Schitt Modi+ and Schitt Heresey. They sounded great from day one but even better after I got used to them over a couple of days. They are excellent for music (at least using something like Audirvana) and gaming is great as well. Very Pleased.

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Awesome open-backed headphones

These were my first pair of audiophile-level headphones. I did several months of research and for listening in my home to my 800+ vinyl, 900+ CDs, and streaming nothing sounds better! I was looking for open-backed headphones that would be great quality, under $700, not too heavy, and comfortable. The Sennheiser 660S more than exceeded my expectations.

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Sennheiser HD 660 S

I had been perfectly satisfied with my older Bowers & Wilkins headphones, P7's, I think. And then I took them out of the secure bag one morning and one phone had come loose from the headband and would not go back together. I stubbornly persisted in trying to repair them but eventually gave in and called Crutchfield for a recommendation. The very helpful, personable, and knowledgeable representative (Steve?) recommended the Sennheiser HD 660S right away. Suffering a bit of sticker shock, I checked around and discovered the reviews are universally positive, ran it by my wife, and tried calling him back. His number disappeared beneath the detritus on my desktop, but I went ahead and ordered, only to discover that I faced an extended wait for delivery, which I attributed to shipping in a pandemic. Finally they arrived a week or so before predicted, and set about learning that the sound is truly as good as advertised. Now I am awaiting the recommended Zen Dac--and looking forward to pleasurable exploration.

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Sennheiser HD 660 S

Excellent, however you need a headphone amplifier to truly appreciate the capabilities of these cans.

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HD 660s (Awesome)

Plenty of tight, quick, articulate bass. Clear, accurate, articulate midrange. Clean, open highs. Excellent imaging. The 660s do what it does with confidence and authority and to top it off these phones are very comfortable. My rig consists of a Schiit Asgard 3, and Modi DAC. I am very happy with my purchase. As always purchasing through Crutchfield couldn't be better. This item I purchased as open box. Arrived fast and in like new condition.

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Great headphones

Music reproduction is top notch. Fit is great (and I've a large noggin). Unit feels solid. I paired with an amp, DAC, and my favorite HD streaming service. I put them on and I'm in my happy place.

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First Love

My first set of higher end headphones so I don't have anything to compare to but these Sennheisers have a nicely balanced sound with plenty of low end. I'm using them with an iFi Zen DAC which includes a bass boost function but I find I rarely need it. The headphones were on sale and still a little pricey but worth every penny.

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Sennheiser HD 660 S

wont find a more comfortable and lightweight audiophile headphones.

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Excellent Quality Headphone

I'm able to hear a lot more detailed sound. I would rate the sound stage as excellent. The headphones have a tight fit, but are still comfortable with the built in padding. I also like the ability to change the cord and also use mini plugs for tablets.

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Sounds good but needs a bit of EQ

I've had these for a couple of weeks and have enjoyed listening to music with them. They didn't sound good through the headphone jack on my Cambridge stereo amp but really came alive with a desktop amp and DAC, a Magni / Modi combo. They are pretty anemic when it comes to bass extension and definition but you can help that a bit with some free EQ software if you look up "oratory1990 eq" on Reddit. Using the EQ software improved the performance of these headphones a lot for me. Out of the box, mids and highs sound good, to my ear. The 660 lends a little silk to vocals and overdriven guitar amps have a good, warm crunch whether I am listening to Mellencamp or Radiohead. I'm picky about how cymbals and hi hat come across and the 660 has pretty good detail without any harshness I can detect. Again, EQ can make a big difference here. Build quality seems good for the price. I think these headphones will last 20+ years but I have read the all the 600 series headphones need the pads replaced often, every year or so with daily use or otherwise, audio quality can suffer. I got these on sale but a more appropriate every day price would probably be in the $300 - $350 range, in line with the Hifiman Sundara. I don't want to put anybody off these but I want to be honest. I'm going to keep them and enjoy music with them but you do need to try the 660 with a decent amp/dac. And they do have some shortcomings, especially if you like to hear a go

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Some of best, but not for everyone...

I extensively compared the 660 S headphones to a wide range of others, priced as low as $79 and up to a similar range as the 660S. The least expensive headphone was Sennheiser's 280 Pro, which I picked up for a great price. Bar none, these are the best headphones I have heard for the cost. The sound is undoubtedly powerful and high-end at the same time. Sound isolation is fantastic, quite simply these are my "go-to" for every day listening. Also compared were Bowers & Wilkins P3 and P5, and Bose Quiet Comfort 35. Just to rank overall sound quality, I would put the 660S on top, followed by the 280pro, then Bose Quiet Comfort (surprised me too), the P5, and finally the P3. What's so great about the 660s? They are so open, and accurate. Very sweet sounding units that demand to be considered "high-end." They offer a refined sound that just sound terrific. That said, the 660s do not have the punch of the others, save maybe for the P3, so if you prefer hard hitting bass that goes super deep, look elsewhere. A check of frequency response indicated that the 660S drops off below around 55Hz, definitely a bit of a disappointment, considering that a lot of current music goes well below this frequency. Another issue that could be considered; since these are open back headphones, you can still hear the room, although this is in the design. Very good headphones, build quality is good & best sounding overall, but not the best for everyone for the price.

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HD 660S

I started with the Grado RS2Es and liked them very much, but a crisp at times. The HD 660S has more bottom end and to me a better soundstage. Also I will be keeping the Grados for now.

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Enjoyable

Very good soundstage but bass could be better. They go down to 10 hz but bass volume could be better. My first set of open back headphones. Overall I really enjoy them and I am very happy I got them on sale.

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Hear what youve been missing!

With these headphones, music is no IN my head - no longer 'out there' coming from my speakers to my ears. It is an immersive experience. I am hearing subtleties unnoticed for a long time and enjoying every bit of music I listen to

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Maestro

I did much research before purchasing the 660 S headphones. The video review presented by Crutchfield was the convincer. My only regret is that I didn't purchase a Sennheiser years ago. I'm a 77 year old audiophile with a particular passion for Classical music. Obviously my hearing isn't as profound as years past. However, with these headphones I can hear sounds from a full orchestra I haven't heard in years from a subtle oboe to a splashing full crescendo.

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Good bang for the buck.

I purchased my HD 660S headphones in "open-box". I would do so again without hesitation. The earcups are uncovered soft foam. They are comfortable, but look cheap, and will surely attract dust, detritus, and soak up perspiration if used in a warm/humid room. Perhaps they provide better sound quality, but I like, better, the look and feel of soft leather-like earcup skins on my Sennheiser HDR-195s. Otherwise, the 660s look well made. I first plugged them into a nonbalanced headphone jack on the front of a PD-F19 multi disk player. The right channel made scratching noises. I then plugged them into the jack on the front of my Pioneer Elite VSX-79Txi surround-sound receiver with the PD-F19 being the source, and heard no noise. I first listened to classical CDs, including some that were "digitally remastered". I was a bit unimpressed with the sound (as I listened, I compared the sound with that from M&L Vantage electrostatic speakers. The 660's seem to have more treble than the Vantages. I listened to a couple of hours 660's started sounding better and better (or maybe my ears adjusted to them). The PD-F19's DAC is 24 bit and I believe upsamples to 192k, but I look forward to trying them with a good new headphone amp. I think the 660s are a great bang for the buck. I don't want to spend $1.2k for the next better model, so I'll keep them.

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Sennheiser HD 660 S

Excellent cans, have really enhanced my listening experience

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The Best!

These are amazing cans! The detail and accuracy are very clear. They are also very easy to drive.

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new clarity

These new headphones have awakened details and clarity in music that I have been missing. In addition, they fit my (large) head and large ears. Recommended!

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Sennheiser HD 660 S

Great sounding and very comfortable headphones

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Sennheiser HD 660 S

Well built, good sounding, comfortable fitting headphones.

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Nice Upgrade

I am very happy with the fit and comfort of these headphones. I have an older, less expensive pair from Sennheiser and find these to be a nice upgrade.

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Sennheiser HD 660 S

Very nice head phones. Sound is very accurate.

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