What was WRONG with the original Sennheiser HD 660S? HD 660S2 Review

[@vikx512]

Finally someone who actually compares the S1 and S2 and not just saying "Its an upgrade, don't use the S1", or only compares it to the 6XX. If I could like the video twice I would, thank you for the review.

[@PassionforSound]

Thanks Vik. Glad you liked my approach. One 👍 is great - thank you!

[@o.f.ftrack3444]

I swear...its been so annoying to see so many people blindly bash the 660s or 660s2 and not even compare them to each other. I get it, the 6xx is a sweet deal and the 600 is a classic but that doesn't mean the 660s or 660s2 isn't better.

[@PassionforSound]

Well said!

[@michaelshurkin613]

As an S1 owner, this confirms my view that there's no need for me to spend the money to move up to the S2. Better to save up for a bigger jump like an LCD X or Focal Clear.

[@PassionforSound]

I think that's a pretty fair conclusion

[@tomdavis6371]

The HD600 was where it really began for me, way back in late 1998. When my son was just learning to walk he got his hands on them and he went down the hallway with them and placed them in the bottom of the dishwasher while his mother was multi-tasking. I was working a second shift job at the time and didn't learn about it until the next morning when I went to put the dishes away. I purchased another pair about 7 or 8 years ago but I decided to purchase the 660S2 recently as a substitute for the Audeze MM100 which I had paid for but has yet to come onto the market. I bought an open box model in brand new condition for the same $400 price and am very, very happy with them. I have never heard the 600S but in comparison to my 600 it's immediate how much more bass response the 660S2 brings to the experience. It punches deep and with authority, though I wouldn't call it a bass lover's dream. It is clean and well controlled, not muddy or sloppy. The mid-range is typical Sennheiser, it's so good. I think the 660S2 is a bit more wide in soundstage as compared to the original HD600. The upper end, the treble, is clear and airy. It's a bit more crisp than the 600 but not sibilant. And I don't hear that notorious "Sennheiser veil" here. I really enjoy the 660S2 for it's overall make-up. It sounds outstanding. It is FUN. It has a heritage to be proud of as it is light weight, ultra comfortable and one just knows that the build quality is going to last for decades if not washed in the dishwasher, and any parts necessary are going to be readily available and easy to replace by oneself using a minimum of tools. I chose to purchase an "upgraded" cable solely because I wished for a seven foot length instead of using the stock ten footer. I think Sennheiser has another winner here. Excellent review, Lachlan!

[@PassionforSound]

Thanks for sharing your experiences - even the dishwasher tragedy!

[@c-samleystudios1573]

Would you describe the HD 600 as veiled in comparison?

[@tomdavis6371]

Yes. It's a terrific headphone and will remain in my stable but once you hear the S2 you'll get an idea what is missing in the 600/650.

[@c-samleystudios1573]

@@tomdavis6371 I have the 660S2 but never heard the 600. It gets lots of fanfare which has me curious. Do you think they compliment each other or should I just stick to my 660S2 and forget about the 600?

[@tomdavis6371]

It's hard for me to answer that for a number of reasons. First off, I don't know about or wish to inquire about your budget, that's none of my business. Secondly, I don't know what you're powering your headphones with. Both of these 300 ohm headphones do both solid state and tubes well. I wouldn't be the first to say that they are magical on tubes. Next, I don't know your age and that may be a consideration. I will turn 63 in about three months and so my hearing isn't the same as when I was younger. For that reason I appreciate that extra kick in the pants of the boosted bass as well as the attenuated top end. Finally, I don't know what types of music you listen to. Can you audition the 600 anywhere? Open to any method of EQ? Are you open to buying a used or open box 600? You're right about the fanfare, it's been around since 1997 for a reason. I wouldn't want to be the guy to say it's not a worthwhile headphone in 2024 just because it is still terrific. That said, now you need to consider that 90's faux granite look headband or the gray headband of the newer 600. I personally prefer the newer look as that 90's granite look isn't particularly gorgeous IMO, and the finish on that 90's version tends to blister and chip/peel away. That was my experience with mine.

[@BrenoSalomon]

The best review I have found on the internet on the HD 660s2. Thank you for taking the time for making something so complete.

[@PassionforSound]

My pleasure! I'm glad it was helpful. 🙂🙂

[@razisn]

Thank you. That was the most unbiased review of these HPs I have seen, not compromised by the price comparison to HD6XX (mostly available only in the US) or the HD650. Sen have a pricing problem with the 6 series which is all of their own making. Personally I own both the 800S and the 660S so I don't feel there's a compelling reason to get these.

[@PassionforSound]

I agree that I wouldn't "upgrade" from the S1. Glad you liked the review.

[@carminedesanto6746]

I’m still rocking my Sen’s 650’s…with every upgrade to my DAC and amplification chain…they get BETTER . Great review 👍

[@PassionforSound]

Yep, there's a reason why they're still so highly regarded across the hobby! Glad you're enjoying them.

[@carminedesanto6746]

@@PassionforSound I had a chance to try the a Meze Emps’ ….they ruined me for other headphones…. But, they did open my eyes as to what ENDGAME and high quality and price units can do ….and yes , I’m saving up for a pair….one day my friend..one day. Take care.

[@SiliDuffa]

Currently watching with my og HD660S. 😎 Great review as always!

[@PassionforSound]

Nice cans!

[@saint_odonnell]

I love how thorough your reviews are!! This covered everything I was looking to know. Thanks for the review 😊

[@PassionforSound]

So glad I could help, Samuel!

[@v1deo_vid]

Went to a store today thinking I'd walk out with the 109s, but after 40 minutes of demoing different headphones, I ended up with the S2s, for many of the reasons you pointed out here. The 109s were brilliant but on some tracks I just found them a bit fatiguing. The S2s were physically and auditorily comfortable, while having a touch more musicality than the 600s.

[@PassionforSound]

Glad you tried it for yourself first - always the best bet. Happy listening!

[@theexpatgunner]

I just purchased a set of new HD660S for €260 which I think was a great deal. I’ve paired it with a FIIO K11 and wow what a step up from everything I’ve had before which have all been closed back.

[@juqual78]

I will say the HD600s are pretty durable lol. At least the classic kitchen counter version that I bought right before they changed the design about 7 years ago. My set were slammed into the desk multiple times over the years and not even a scratch! Only thing I've had to replace is the velour ear pads. OG cord still in perfect shape and working order despite running it over with a huge chair and almost yanking it out of the sockets nightly if not hourly. I wore them in humid outdoor environments almost nightly for about 2 years taking them on walks, but that did take a toll on the pads so I had to replace them more often. Still works perfectly after all these years and almost as good for quite a few types of music as my way more expensive hi-fi 2 channel speaker setup. So good so that I just went ahead and picked up the HD660S2 for $400 US, as they are on sale now. Based on my experience and what you and others have said I'm sure I will be very happy using these at work with a small portable dac/amp. I'm am not a bass head but having a bit more accurate and present bass as well as treble will a welcome addition and surely help with dynamics. Imo you should never pay full price for SH and I didn't for my HD600s 7 years ago, which are 300 bucks now and were 300 bucks back then (both sale prices , 7 years apart). Wait for the really good sales as well. If you can get 25%-33% off retail, this became a bit of a no brainer, assuming you like this style of headphones of course. This isn't a headphone for loud areas or bass heads. It will sound worse than 50 dollar Sony earbuds if used in the wrong enviros. Cheers!

[@PassionforSound]

Thanks for sharing your experiences

[@c-samleystudios1573]

How would you compare the HD 600 to the HD 660S2?

[@johnellison3173]

Finally a review that compares the s2 to the s1 instead of just any sennheiser headphone that the reviewer has lying around. Many reviewers keep comparing it to the 6xx which is a pointless and lazy comparison imo

[@PassionforSound]

Glad you liked my approach and thank you to Aaron for lending me his OG 660s!

[@En_Joshi-Godrez]

Its because the 6xx and hd600 absolutely thrashes them at half the cost. It makes perfect sense to compare them. You dont want a fair comparison, because it will lose, plain and simple.

[@johnellison3173]

@@En_Joshi-Godrez Thanks for sharing 😆

[@PassionforSound]

I've owned the HD650 and HD6XX and can't agree that they thrash the 660S2. The 660S2 is noticeably more refined (smoother) while also delivering better bass and resolution.

[@danaillaysen7632]

Could you please elaborate on why its a pointless comparison. Also I like the fact PFS hides behind any comment trying to defend him. You liking your own comment, then him hearting a response to a very obvious remark. Kinda sad.

[@TheYuhasz01]

Useful comparative review. I own and use 600’s and 660S. The S2 are a slight upgrade. I modestly EQ the 660S listening to a RME Dac and cds.

[@PassionforSound]

Yes, the 660S2 isn't redefining anything, but they are a nice iteration on the HD6 series IMO

[@TheJamcentral1]

Best video on the topic I’ve seen so far. Appreciate including gaming. Looking at desktop headphones it’s odd to see just music centered reviews. Gaming, movies, sound content in general should be apart of a review so I very much appreciate hearing your opinion on that.

[@PassionforSound]

My pleasure. There's always lots of ground to cover on a headphone review so I don't always include gaming, but the patron who lent me the 660 S1 discussed gaming with me so it was front of mind.

[@HoosierRooster]

I still have my HD 424's....love them

[@m4nc1n1]

I like the new color but I do not see replacing the S1 with the S2. Love the copper tho

[@Enigma1990ad]

Great review! I currently own the 660s1 and I love them however there are some tracks I listen to where the treble gets a bit sharp and I can feel like the bass wants to go lower but cannot with the S1. For Prime Day earlier on this year they were selling for $379.00 so I'm waiting on another Prime Day sale to get the S2.

[@PassionforSound]

Hope you get yourself a bargain!

[@denizekin80]

@@PassionforSound These are selling for $399 now during Black Friday. Makes it a bit more palatable than the $599. It also makes the Meze 109 effectively twice the price of 660S2. By comparison, one can pick up a HD 650 for $287.

[@aceofspades6667]

Definitely the comp to the 109’s is the right choice was immediately what I thought of when you kicked off the review. Seems like a no brainer choice at the price point but not a world beater if you have a bit more budget.

[@PassionforSound]

That's a great summary, I think!

[@syanhc]

I’m keeping my original HD600…

[@giubin]

Thanks for your Passion in this review.

[@PassionforSound]

My pleasure!

[@NotInsaneMatt]

I have the S1 and love it. Would you recommend upgrading to the S2 at this price? Or is there not that much of a difference to justify it?

[@PassionforSound]

I think both are excellent headphones. I would personally choose the S2 over the S1, but some will like the sense of texture in the upper mids from the S1. I don't think I can tell you much more here than what I explained in the video - sorry.

[@blackjohnny0]

Sivga has amazing build quality and their products are most comfortable.

[@PassionforSound]

I agree

[@dar._]

The Dekoni label was on the Box mate, but you figured that out :D

[@PassionforSound]

Haha. Yeah, I threw the box out after we chatted and didn't think to take note. Luckily, it wasn't recycling week. 😁

[@childofeternity]

Good review. I have the original 660S and would love to try something like the Meze 190 Pro but the price is just too much for me... saw on ebay a pair of refurbished 660S2 (returns they say) from the offical Sennheiser site for about $400 (£354 UK) and after some umming and ahing decided to get them. I'll hopefully sell my 660S for around £250 on ebay... the 66S2 will effectively cost me about £100 then.

[@PassionforSound]

Nice deal. I hope you love the S2.

[@chungang7037]

The real problem for me is the price point and the fact that the HD600 exists, at half the price or less.

[@pappsa8]

The fact is the Thieaudio Ghost EXIST!!

[@harackmw]

@@pappsa8 the hype at least is real

[@pappsa8]

@@harackmw Some talking about its a hype some of us like me bought them and i have to tell i dont owne anymore the 109pros! Checked my opinions about them on hifiguides! My Ghost sitting next to my t60rp Argons for example and not the mezes! Both need the burning times!

[@pappsa8]

@@harackmw “hype is real hype is real” bla bla bla Jesus

[@PassionforSound]

The HD600 and HD650 are still great, but I do see the HD 660S2 as an upgrade. Can't comment on the Ghost yet...

[@SeventyZombies]

Great review! The comparisons were very informative.

[@PassionforSound]

So glad you found it helpful!

[@frederf69]

i already have 4 different connector types & dont need another; wish there was more universality to the HP market in this regard 😤already spent 6oo usd on after market cables 😤 the only one which makes any sense other than 3.5mm, is the Hirose; can dis/reconnect those as much as you like. Great & thorough review as usual, but i'll be skipping these ✌😎👍 thank you!

[@PassionforSound]

Yes, it does get tricky with all the different connectors. I don't bother upgrading the Sennheiser cables because they're single use cables. 3.5mm, mini-XLR and Hirose are at least multi-brand capable

[@lukasjanecka9996]

Thanks much for the review Lachlan! I always keep eye on the HD600 line because these are literally the best fitting and one of the most comfortable headphones I have ever tried. Also, I enjoyed the music a lot on the original HD600. I found them excellent for that „sit back and relax“ use case you described. I have since traded them for more technically capable headphones but I still question that decision sometimes to be honest :) I was particularly interested in your comparison with SV023 which are my headphones of choice at the moment. I would consider them pretty much perfect for the price if only they didn’t have that 4K peak... Could you compare their soundstaging with the 660S2 please?

[@PassionforSound]

Glad you liked it, Lukas. I think they're fairly comparable on soundstage size, but the HD660S2 has a little more sense of space between the sounds so it does probably come across just a little more spacious. If you're generally enjoying the SV023, but want a little less aggression/a little more smoothness then the 660S2 would be a great choice I think.

[@lukasjanecka9996]

@@PassionforSound Interesting, thank you!

[@Tripokaridos22]

OK i have all HD6 and HD 5 line. This Man Knows Exactly what he is saying. ( not like other more known youtubers) . So In my opinion...HD600 Vocal Kings, HD650 smooth warm sound Kings, HD660s Gaming Kings, and HD660s2 I can Do all very good but nothing special. If i have to have 1 of them it would be HD660s2

[@PassionforSound]

Thanks for sharing your experiences with the HD5 and HD6 range. You have quite the collection! 🙂🙂

[@Tripokaridos22]

@@PassionforSound I love Headphones it was my Dads hoby 70 years back and now my hoby.

[@gregsullivan7408]

The voltage sensitivity specs you put up are identical, so no, they will NOT require more voltage to drive. They will, however, require LESS current, and thus, LESS power. 😃 (but yes, portable devices will struggle a bit, just like the S1)

[@PassionforSound]

Sorry, I said that in a rather ambiguous way. I think I was referring to them needing more voltage than other headphones, not a direct comparison to the OG 660 at that point, but it wasn't clear.

[@gregsullivan7408]

@@PassionforSound ok. It's worth noting that due to their higher impedance, they will of course be louder than the S1 on amps with a somewhat high output impedance, for a given volume setting

[@anatol1204]

Very nice review..but wouldnt be also very intersting if there was also sundara in the comparison test that is also flatish open and priced around 400 ?

[@PassionforSound]

Unfortunately, I don't own the Sundara anymore as a comparison. It would have been interesting.

[@anatol1204]

@@PassionforSoundYes maybe next when Audeze mm 100 is available..😉 Please IF.. you can find make a Blessing 3 or SA6 mk 2 review on the future I think many will be interested..Thanks for the nice reviews! 👋✌️

[@PassionforSound]

Blessing 3 is here and will be up for review as soon as I can get to it 🙂

[@anatol1204]

@@PassionforSound Niceeeee!! 👍

[@6643bear]

Hi , I have hd660s2, but I fitted 32mm velour pads to those and 660s and my custom cans bass mode on my 6xx, I can say the the 6xx bass is not far of 660s2 . Regards mark

[@danielc.4824]

Hello. I would like to know which one do you think is better between the Hifiman Edition XS and these?

[@PassionforSound]

They're very different and will appeal to different people, but I definitely prefer the Sennheisers. The Sennheisers are more comfortable and produce depth in the soundstage. The XS produce a very flat stage that I find quite unnatural

[@6643bear]

Hi , great informative video, sennheiser is now doing hd660 s1 at £259 at he moment now can be interesting at this price point . Regards mark

[@PassionforSound]

That's a great price for them! Glad you liked the vid.

[@6643bear]

Hi again , I just bought an open box 660s2 for £269, but best price is £359. The bass is definitely better the s, but I have 6xx with custom cans bass mod and it’s very comparable to 660s2 , I do have thicker 33mm pads in the 6xx and waiting for another set to try in my new 660s2 to see how that changes the sound signature . Regards mark

[@TheVeganVicar]

I sold my 2002-bought 600HD a couple of weeks ago due to the fact that I almost never used them (one of the perks of owning a pair of world-class, full-range mastering monitors). Perhaps I'll order the 6XX from Drop when I get the cash?

[@soulfulfool]

yea I would also lean towards 6xx, 660s2 are too expensive

[@PassionforSound]

6XX is definitely brilliant value for money. HD 660S2 is clearly the best HD6-series headphone to me, but I get the hesitations around its price.

[@TheVeganVicar]

@@PassionforSound, thanks for the tip, Lachlan! Incidentally, there are no long vowels in the Sanskrit/Hindi word "SUNDARA".

[@soulfulfool]

@@PassionforSound I sold my hd600 but felt the need to own Sennheiser 6 series so I bought it again this time 6XX midnight blue version made in ireland 😅. I would pick up 660s2 if it wasnt 3x more expensive not giving me 3x more quality

[@PassionforSound]

Yeah, a price drop will definitely help the 660S2 I think

[@tecno4u31]

Hello. If you had to rank the following headphones from best to worst for technical performance and tonality, how would you do it? This helps me a lot to get an idea! -Sennheiser HD660 V2 -Hifiman Edition Xs -Meze 109 pro -Sivga Sv023 -Focal Clear OG

[@PassionforSound]

I think 109 Pro and Clear OG would tie for first (I've never compared side-by-side to split them) Next would be HD 660S2 and then Edition XS (due to poor stage depth - everything else it does very well) and Sivga SVO23 whihlch is also excellent, but just not quite as good as the others.

[@GadZookz]

Great video, Thanks! How do you find it to review headphones live as you listen? Some of your colleagues seem to slip into a fugue-like monologue as if they were speaking in tongues, which must leave them quite fatigued afterwards. One could argue that live listening reviews allow less room for vague descriptions and some reviewers even might be tempted to renege later especially if the headphones are currently in vogue.

[@PassionforSound]

The hardest part for me is that I need time to listen and think, and switch back and forth before reaching solid conclusions so there's a lot of "dead air" when I review live. That's fine for the behind-the-scenes reviews I share with patrons because they're deliberately un-produced/unpolished, but I think too many people would switch off if I did my public reviews like that. I also think that it is hard to avoid people hearing the first thing you say and jumping to conclusions so while it's not so much about reneging, there are lots of times I'll make a note or say something in a BTS review and then a few moments later, I'll go back and adjust what I've said with some more nuanced or a better perspective.

[@himanshutiwari90]

How is 660s2 compared to clear og , in terms of detail. Which one will you pick lachlan at same price

[@PassionforSound]

The Clear OG is the better headphone for detail retrieval. It's a more exciting listen, but can also be more fatiguing so they're a little different in that regard.

[@dasninjastix]

I was on the fence, or "feeince" as I believe you say in Australia, about scooping up the 660s2. Owning and liking the 6xx, that sound signature with more resolution would be pretty welcome in my home. But you audiofreaks won't shut up about the HD600 and how amazing it is and how it's still the standard and how the successors thereafter just don't match it for it's qualities and yadda yadda yadda. So I went with that instead for a 1/3rd of the cost and yeah.. pretty damn good headphone actually. Dare I say preferable to the 6xx. I still think the 660s2 is appealing but.. the 600s and 560s seem much more appealing given their potential cost to performance. I have a PC38x and while the form factor is down right insultingly cheap, the sound quality (extension and imaging particularly) is well above the price point. If that's just a twin/sister to the 560s then the 560s is a crazy value as well. I think I would like to collect them but it'd have to be sub-300. The more Meze and ZMF I own the less and less forgiving I am with the Sennheiser build at the initial retail price point. Especially when you consider the pad materials and the cabling. Nothing wrong with either, but at the price they could be much much better than average.

[@PassionforSound]

Yeah, the 660S2 is brilliant, but hard to justify the jump in price from the 600 even though it's a bit better. To be fair, it's a big jump to the ZMFs, but the 109 Pro is the headphone I'd save up for over the 660S2.

[@christiharris292]

Thank you for the exceptional review as always Lachlan. I have the HD6XX and the Meze 109 Pro, so I think I will try to Dekoni pads on the HD6XX and see what they bring to the table. I will keep these on the list to demo if I get a chance. Again thank you for always being so thorough in your reviews, I have learned and spent so much (😃) based on your awesome reviews!

[@PassionforSound]

My pleasure, Christi, and sorry about your wallet 😉

[@Ray-dl5mp]

Great review. Per the video seems like Sennheiser basically fixed what people probably thought was lacking on the HD600 and a lot of the HD6xx line with the lack of sub bass. So more spacious sound and better sub bass (per other amazon reviews) sounds like the perfect Sennheiser headphone for under $1k when they already did an incredible job with this line. I wouldn't be surprised if this review is spot on, perhaps the perfect all around headphone but nothing that jumps out at you and goes that's the greatest thing I've ever heard...but the whole package is incredible for under $1k. Of course those are my guesses without listening to them myself but it sounds like a very attractive potential upgrade for an HD600 user which I currently am and this wouldn't break the bank. I considered saving up for the Arya's but those aren't cheap at all and this is just a little under half the price of the Arya Stealth. Decisions.

[@harackmw]

I am surprised you got that from the review. Lachlan rarely comes out and is negative about any headphone, but if you re-watch his conclusion especially there are a lot of qualifiers in there to caution anyone from getting hyped about this headphone. It is simply fine, not ground breaking, and for half the price you can get similar performance [or better] from other headphones in the 600 line, especially the 600 or 650. From that point of view, it is not a stretch to say they are a bit of a disappointment for that price and I'd argue they are not worth it compared to the competition. But Senn fans are probably going to eat it up, which is probably who this is for.

[@Ray-dl5mp]

@@harackmw yea I think you could look at it both ways. He basically said nothing about it stands out but the total package is a great all a rounder or great way to relax and enjoy the music. He did claim it’s not a great toe tapper. You could also argue a lot of music and headphones come down to trade offs. So just because something doesn’t stand out in one particular department doesn’t mean it’s a disappointment. It sounds similar to what the hd600 already is (popular headphone in the community I imagine) just with better sub bass and better space/soundstage, and perhaps better detail ( based on what I’ve read online from random posts or user reviews so I could have bogus info). But definitely possible there are trade offs with hd600 and hd600 may still do some things better. I’m considering it based on things I’ve read online. I think it’s cool that Sennheiser is basically giving fans the option that fills in what people wanted. And it’s priced accordingly. But yea compared to the competition, am I bias and only focusing on Sennheiser under 1k - yes definitely - because I like the hd600. Good thoughts by you. I shouldn’t have said it’s the best option under 1k perhaps but it might be if you like the hd600 but you wish it had a couple tweaks. I wouldn’t know unless I tried it. I’m sure other brands do a great job too.

[@harackmw]

@@Ray-dl5mp I also have the HD600 and though I moved on to other headphones I keep coming back to it, as it also seems to scale with better amps and those that can handle 300ohm, so it is fun to take out once in a while. Yes, my bad, I meant for myself I was somewhat disappointed. But that is true for a lot of Sennheizer's lineup. I guess I was referring mainly to the old critique of the 600, 650, and 660 variations where differences between them are slight. I struggle to hear a difference between them to justify the added costs, or claims that there are massive differences between them, as I felt the differences are not that drastic and in a blind test I would probably fail to pick them apart from each other. So with the 6602 I was hoping it would be a departure from this trend, but it does not appear to be so. I wonder if the HD700 reviews burned them too badly, and they were raked over the coals for making a warmish headphone and so have opted for higher price points but with little variation because it is a safer bet with their fanbase. Anyway, I digress...

[@Ray-dl5mp]

@@harackmw Yeah I totally get your thoughts. Based on early thoughts I've read online (I haven't watched all the big reviews) I am hoping this was more of a departure than the other ones in the 6xx line (as some people on reddit and amazon seem to think this is a good update). I totally agree with you before this headphone though, the full HD6xx line only seem to have minor differences from each other, and a lot of audiophiles seem to prefer the classic HD600 where it's hard to beat for a great all rounder. But again, I think the HD660S2 sounds like the perfect upgrade on paper finally as it does look like they attempted to fix or improve the things that were lacking in the 6xx line. Is it overpriced? Perhaps but maybe not if you're getting a better version of the HD600 and it seems like some people online already prefer HD600 to more expensive headphones. But this is all a big IF. That being said, I pulled the trigger and I should get it next week. So I'll try to report back here with my thoughts. I couldn't help it as I do think improving the sub bass could be pretty awesome if they keep the things I love about the HD600 and perhaps make other small improvements as well.

[@PassionforSound]

I think you're both right here. The 660S2 is an excellent headphone and one that I continue to use regularly. However, it's probably not as special as it SHOULD be for the price when the OG 660, 600, 650 and 6xx all exist. For me, it's a perfect all-day headphone for editing, video calls, multimedia, etc. but if I want a really exciting musical experience, I'll tend to reach for something else like a Meze 109. Having said that, the 109 is a clearly higher priced headphone.

[@spamcan9208]

It's a shame they didn't take this opportunity to ditch the proprietary connectors and I don't know why they use that weird, awkward 1/4 to 3.5mm adapter instead of doing what everyone else does. What changes did Sennheiser make to the drivers to increase resistance? I've always wondered how that works. Btw, the Spinfit 360 does work on my OH-10 but they are very fiddly and tricky to get on because its diameter is even smaller than the CP100.

[@PassionforSound]

They are probably in a hard place with the connectors. Changing connectors would have meant a new chassis design and probably would have angered all of the people who own and love their existing HD6.. headphones and have already invested in aftermarket cables. As for the increased impedance, that's all about the design of the voice coil. Using different metals, the thickness of wire and the number of turns in the voice coil will all influence impedance and performance.

[@mimu9599]

First time someone say that the Frequencydiagram dont show the sound...thank you

[@PassionforSound]

My pleasure. They're of limited use in my experience. Not useless, but a very small part of the overall picture

[@greymatterstome]

I recall there was a time when I would be excited by a rare ,new Sennheiser release. Considering the market is flush with options at the price point, my feeling now is rather meh.

[@PassionforSound]

I can definitely understand that. I do think the HD 660S2 holds its own in the market, but isn't redefining anything

[@ChrisKeyman]

Hi! , how do they compare with the DT900 ProX? Thank you

[@PassionforSound]

The 660S2 is at a higher level of performance so things like instrument separation, refinement, etc. are better. The DT 900 is a bit more bassy and energetic than the 660S2 so there will also be a degree of tonal preferences that comes into play.

[@ChrisKeyman]

@@PassionforSound but is the dt900prox more neutral ? Thank you

[@PassionforSound]

That's a tough one, but I don't think so. I'd say the 660S2 is the more neutral headphone.

[@kendoglarson5419]

Hey, if i can get an 650s for $250 should i go for it ? Or what might you think is a good alternative for a versitle and detailed headphone? Whats the winner in the $250-$300 range?

[@PassionforSound]

For $250 it's a good option for sure. The only other option I'd consider I think is the Sivga SV023.

[@kendoglarson5419]

@@PassionforSound Thanks for responding. I have to check these SV023 out. Enjoy the channel 👍

[@ALDIA365]

Hi! For listeing Ambient music Sv023 or Hd660s2?

[@PassionforSound]

Both are great headphones, but it depends on how you like to hear the genre.

[@ThorDyrden]

Still struggling weather to buy the 660S2 or the beyerdynamic Amiron Home to connect to my PC's DAC. Listening to music for relaxation or sometimes just in the background, while working... music is more bass-heavy (e.g. melodic Dubstep) The additional use for KZbin or a videa-call will not challenge the audio of any headphone, but means I sometimes have to wear it for hours And in the evening sometime it will be used for gaming, where the soundstage will be somewhat relevant. Both are about same price here... and I like both brands... Amiron's build quality seems superior and from what I researched so far both headphones are worth their money and offer "upper-midrange" Hifi-experience.

[@PassionforSound]

For such varied use, it's a tough call. The biggest factor for me with these two is that the treble from the Amiron can be a little bright depending on your source chain and personal treble sensitivities. They probably do bass better though and might suit gaming a bit better too.

[@ChillToMusic87]

Whether.

[@therealwhite]

I don't have an S2 but I've had the 650 and 660s1 and the Amiron and personally thought the Amirons felt horrible to wear and sounded horrible to boot, it somehow managed to be a dull, flat, yet painfully sharp sound. Sennheiser tends to sound very even without weird emphasis on certain frequencies whereas the Amiron sounds like the frequency response been in a car accident

[@PassionforSound]

Thanks for sharing your experiences

[@maciejpfs2631]

Hello, what do You think about pairing hd660s2 with xduoo ta 26 ?:)

[@PassionforSound]

That would be a lovely setup!

[@peterlyon9629]

Would the ifi hipdac 2 have enough power to drive the S6602s?

[@PassionforSound]

Absolutely, particularly if you use the balanced output it has plenty of voltage.

[@peterlyon9629]

@@PassionforSound thanks!

[@Grrrr3FKAGrrrrGrrrrGrrrr]

Is the HD660 more comfortable than the HD650? I don't like the wearing the HD650, it creates a sore point right on top of my head. I have heavier headphones that I find more comfortable.

[@PassionforSound]

It's a long time since I owned the 650s, but I find the 660S2 very comfortable for long sessions. That's all I can really say - sorry

[@Ray-dl5mp]

They are just as comfortable as the HD600's to me - Edit: Just tried on HD600 again to compare. The HD600 fall softer on the ears (it's not like the HD660S2 hurt putting them on), but when I'm wearing both they feel almost exactly the same. Basically the same feel, not uncomfortable. I don't see why the top would hurt, as there is padding there unless you aren't adjusting the headband, sounds like you just need it slightly adjusted in headband so it's not as much pressure on top of the head. But I don't own the HD650's so perhaps they are different but I assume all these headphones are very similar. Maybe it depends on shape of head though, but I know what you mean about pressure on top of head if I don't adjust the band enough.

[@killervampir]

How would u compare them to the 6xx? Would it be an upgrade?

[@PassionforSound]

I didn't own the 6XX anymore when I did this review, but the 660 S2 is clearly a better headphone in every way to my ears.

[@the12gaugeshotty]

I just got the 660S2 and own the HD58X, definite upgrade from the HD58X.

[@PassionforSound]

Yes. That's a big step. Glad you're enjoying it!

[@marcelbraendli3862]

My 4 year old boy's favorite drink is chocolate milk. He doesn't care what headphones I put on him. As soon as I play this KZbin video, he falls asleep within 2-3 minutes. Thank you for that :)

[@PassionforSound]

LOL. This must have been during my quiet talking phase because my 3-year old was sleeping right next door. 🙂

[@generaljericho889]

Hi, which headphones would you recommend for movies?

[@PassionforSound]

That all depends on your budget and what you value when listening to movies (i.e. bass rumble, detail, soundstage size). What's your priority and budget?

[@generaljericho889]

@@PassionforSound my budget is around €500. I value bass and dialogue clarity if that makes sense.

[@PassionforSound]

I'd probably check out the Zeus Elite and Athena headphones from HarmonicDyne and the Beyerdynamic DT 900 Pro X.

[@blackjohnny0]

At this pricepoint Sivga might be very strong competitor.

[@PassionforSound]

Yes. The SV023 is definitely an option. I think I included a comparison in this review.

[@criticactual]

🎧Hi! Based in your experience in headphone, could you rank the following for enjoy music? -Sennheiser Hd660v2. -Focal Clear. -Meze 109 pro. -Hifiman Sundara. -Hifiman Edition Xs.

[@PassionforSound]

Hi! I think I'd go: 1. Clear / 109 2. HD660S2 3. Sundara 4. XS All are good, but that would be my order of preference

[@LandsPlanes]

​@@PassionforSoundwhere Will be sivga sv023 in that rank of the guy?

[@PassionforSound]

I'd probably put the SV023 above the Sundara, but below the HD660 S2. Perhaps, on the same level as HD660 S2.

[@dM3tria]

I agree. I own both and the OGs have a kind of warm sound with the singer closer and warmer. the S2s have a very bright sound and the singer is farther away but you can definitely hear each and every note where as the S1s have a muddier warmer sound to them and therefore it's harder to hear each instrument/sound. The S2s are amazing for ROCK just absolutely absurdly better at listening to Rock and Metal than the S1s which again sound warmer and muddier and thicker and it's very hard to distinguish each sound with the S1s. The S1s on the other hand make listening to music with very vocal present AMAZING and a must have. The singer with the S1s sound like the singer is right there with you and present warm and it just gives you an intimate experience. The S2s with vocal present songs makes the singer farther away and a more brighter and sharper and clear sound to the vocalist. So that's basically it. S2 is for music, S1 is for vocals.

[@PassionforSound]

Thanks for sharing your impressions!

[@Surfboyfun]

Please Dekoni Pads for 660s2 model?

[@PassionforSound]

I haven't looked into that. I tend not to pad roll in most cases because I like to keep the headphones in their stock form for review comparisons.

[@jaybrodnax]

Idea: I'd love to see a round up of high impedance headphones for tube amps

[@PassionforSound]

That would be cool, but I haven't kept that many high impedance headphones around to be able to compare them. I could run through which models I've tried and generally how I liked them. Would that work?

[@jaybrodnax]

@@PassionforSound better than nothing! I have the HD650, and I'm wondering what headphones would be an interesting compliment in the tube context. The HD800S, SIVGA SV023, ZMF, fiio ft3 come to mind... especially in the mid-priced arena would be interesting

[@PassionforSound]

For mid-priced, the SV023 are a winner for sure. I'm working on getting the FT3s in for review so sit tight for that one hopefully 🤞🤞

[@jaybrodnax]

Thanks!

[@PassionforSound]

Thank you Jay!

[@SynysterCondom]

Do you have any dac/amp recommendations for the 660s2?

[@PassionforSound]

They work well with most setups so I don't have any strong recommendations and it will depend a lot on budget too.

[@thorfinn518]

Is kio pro5 any good​@@PassionforSound

[@PassionforSound]

I don't know that one - sorry

[@davidjd123]

someone should make a mic for these, a proper mic, one that plugs into the headphone

[@PassionforSound]

That would be good. I'm guessing you're aware of the ModMic already

[@timothyfreeseha4056]

Sennheiser seems always to show good will by accepting feedback and making adjustments to its headphones via that collaboration with its consumer/ enthusiasts base. I think they have been at the front in this respect, which has had its influence on other manufacturers.

[@PassionforSound]

Great point, Timothy! They have been very good like that with the HD800 -> HD800S, 660 -> 660S2, etc.

[@babaker48]

Now with the price changes the 109 Pro is twice the price of the S2. Hard to justify.

[@PassionforSound]

Hard to justify the 109 Pro?

[@BassDad8]

Okay the bickering in the comments was not at all helpful. Thank you for not taking the bait. I have a serious question almost a year later. I can get these for $400 right now. I’m really open minded as far as tonality, and frequency response/emphasis is concerned. So I just want to know, as objectively as possible in this highly subjective hobby., Are they worth $400?

[@PassionforSound]

I think these are great at $400. I'd grab them for sure.

[@BassDad8]

@@PassionforSound I missed my chance. When to buy them last night and they had sold out! Was really looking forward to what my TA-22 would do with them too! Oh well. Next time 😄

[@BassDad8]

@@PassionforSound They just came back in stock!!! I’ll have em in a week. Now I’m REALLY looking forward to them. 😄 Thank you!

[@PassionforSound]

What a rollercoaster! I'm glad you got them in the end! 🙂🙂

[@pelilin2519]

Hd660s2 is like mini ZMF

[@PassionforSound]

Yes, there are some similarities

[@EricRosenfield]

I think what you really need to compare these to are the HD600 and HD650 to see if they're actually the upgrade they're poised as.

[@PassionforSound]

I don't have either of those here at the moment, but having owned the 650 and 6XX for many years at different times, the 660S2 is comfortably better. More space in the soundstage and separation of instruments plus much better bass extension. I think the sound is also more refined without lacking definition and detail

[@Nico-rw2tl]

I just bought a 660s1 at the price of 289€ for my piano before it disappears...

[@PassionforSound]

Good deal!

[@intel2133]

Him or 6XX ?

[@PassionforSound]

I'd choose the 660S2

[@intel2133]

@@PassionforSound worth the upgrade ?

[@PassionforSound]

I think so, but they're different so some will prefer the 6xx

[@harackmw]

Sennheiser's track record makes me think their successes are based on pure luck. The HD600, the 800s, 6xx, you rarely hear about the rest. They should be doing R&D on what happened with the HD600 especially, why does it work, why has it remained a go-to headphone for so many. Many of the 600 line also sound so similar, it seems pointless to own more than one. They really should have tried to go for a different tuning or reach another level of detail/resolution for the asking price.

[@PassionforSound]

I don't think it's pure luck. They have plenty of less popular models that still sell very well - they're just not regular "audiophile" recommendations. When you think about most brands, very few have more than 1-2 cult favourite headphones so, in some ways, Sennheiser are ahead of the pack

[@harackmw]

​@@PassionforSound True, but Sennheiser is kind of like the Philips of the audio world. A trusted brand name, been around a long time, but when you consider how long they have been around [especially the HD600s, from the 1990s] you'd think they would have more hits on the market than their competition, whereas brands new to headphones have just as many hit headphones, at least I would argue as much. Each brand I can think of has 2-3 that stand out, maybe more, whereas Sennheiser has only three or four over the past 35 years. The 600, 800s....the rest seem redundant to me and I have demoed most of them beside each other in a store. Anyway, just my perspective~

[@PassionforSound]

That's fair, but I also think it's worth considering that those new brands might end up looking much the same in 10-15 years from now. Headphone tech doesn't change rapidly like DACs or amps (although those are a bit debatable too). I think the fact that Sennheiser have taken long term, beloved series like the HD600/50 and upgraded them, the HD800 and upgraded it, and produced the IE600 and IE900 which are amazing IEMs, all make for some pretty solid performance. The new companies have started from nothing so they have to pump out new products to build their brand. Sennheiser are established and need to maintain their performing products and update them accordingly. I think they've done that. Not saying you're wrong, kit sharing a different possible perspective. They're both just out personal opinions in the end so no hard facts either way. 🙂

[@harackmw]

@@PassionforSound I guess time will tell, as you say. After some time we will also see if the price of the 660s2 drops down to the price of the others.

[@PassionforSound]

🤞

[@shreddherring]

Ah yes, I gave my wishlist on sennheisers customer feedback thread, telling them everything I would love to see implemented in a re release of the HD700. And they took every single suggestion, and re released the HD660 instead. D'oh!

[@PassionforSound]

Haha

[@Ray-dl5mp]

It does feel like they listened to all feedback on this line for years and finally gave people the upgrades they wanted.

[@shreddherring]

@@Ray-dl5mp to be fair, I think they always have done. It just also seems to be the case that people were never happy, each time they released a product to meet what people said they wanted

[@Ray-dl5mp]

@@shreddherring yes fair enough. I’m a big fan! This product gave me a reason to get it as I already have hd600 which is still a great product. But I didn’t want to pass up the changes they made to this new one as it seemed like a great upgrade in some ways. And it really is and I still think hd600 has its place for its midrange and comfortable listen. This just seems to be a landmark product like the HD800s and HD600 are. Maybe reviewers won’t see it the same way, not sure. But to me this creates a different sound that stands out and is enjoyable. I’ve never tried 800s so I’m just going by online reactions.

[@shreddherring]

@@Ray-dl5mp I've not heard either 660, as I'm not too keen on a narrow presentation, but I am sennheiser fan. I have about a dozen pairs of sennheisers, plenty of pre-600 era

[@GREGBT69]

What about listening to theses with a bottle of tequila 🤔 . Now that would have me smiling. 😅 Good vid.

[@PassionforSound]

Yes, that will do it! 🍻

[@chefsteve8381]

Sennheiser have been asleep at the wheel with headphones for so long surely they can do better than a spit and polish on an old headphone...

[@PassionforSound]

It's a lot more that a spot and polish, Steve. It's a whole new voice coil (i.e. driver motor) with noticeably better performance. I do think it's a little overpriced for what it is, but there aren't many other brands (Meze with the 109 being the exception) that are leaping ahead of them on price/performance.

[@Ray-dl5mp]

I actually think that's what's so awesome about this headphone. It's the perfect update to the HD600 in my opinion. Doesn't ruin the strengths of the 6xx line but adds improvement in bass presence and detail but doesn't overdo those areas and still keeps voices sounding great. I like to think they took decades on this and finally figured it out ha. That being said, I still think HD600 has the magical midrange. Always trade offs with audio, but this (HD660S2) is an incredible all arounder if you aren't someone that needs something super bassy or super detailed - but again both of those are very enjoyable imo.

[@CraigArnolduk]

Comfortable????? The clamp force is unbearable for more than 15 mins.

[@PassionforSound]

You can always stretch the headband. Just place the headphones over a box or something a bit wider than your head for a day or so.

[@CraigArnolduk]

@@PassionforSound I did it for 2 weeks. Clamp force still unbearable. Most uncomfortable headphones I've ever had the misfortune of owning.

[@PassionforSound]

Wow. I'm sorry to hear that!

[@Ray-dl5mp]

These headphones are very similar to HD600 for me in terms of comfort - almost exactly the same once its on. Overall: Super easy to wear, very comfortable. Did people just not adjust the headband or something? Maybe it depends on the shape of someone's head.

[@PassionforSound]

We do all have different head shapes and sizes so I think that's what's happening

[@tonytramonti5828]

R. A. M. U. N. O.

[@PassionforSound]

You keep posting that, but I really don't know how to reply? 🙂

[@DocFUNKist]

They leak horribly… everyone next to you would listen to to what you’re listening to at a rate of 6/4 almost splitting the level… beyond joke!!!!! It doesn’t do anything wrong…lol sure…

[@PassionforSound]

They're an open back headphone. Of course they leak 🤷

[@DocFUNKist]

@@PassionforSound I don't have the expertise on this but to me they looked CLOSED. I own HD-25 which I loved (minus the cable issues) and they do not leak as much despite them being open headphones... it's ridiculous design.

[@PassionforSound]

The HD-25 are a closed back headphone (no holes in the rear/outside cup). If you can see into the back cup/grille, the headphone is open back and will leak.

[@DocFUNKist]

@@PassionforSoundlearnt my lesson… thanks and well done for the video

[@allansh828]

Sennheiser forgets that the build and comfort of 600 series really needs renovation. They are built like $50 pairs and clamp too tight.

[@harackmw]

I stretched my HD600 out and they are way more comfortable now.

[@PassionforSound]

I find them very comfortable and don't feel that they are cheaply built. There are so many examples of original 650s and 600s that are still going strong 15+ years later. That's not cheap build quality.

[@the12gaugeshotty]

You pay for the drivers when it comes to Sennheiser. Clearly they are doing something right. I have the HD58X and 660S2 and both clamp fine after a couple days of wear. No problem at all after that. Plastic is plastic but they have quality plastic that lasts decades without an issue.

[@yifuhood]

Just buy a r70x

[@soulfulfool]

with tube amp

[@PassionforSound]

Having owned the R70X, I wouldn't agree with this. They're fine, but they don't provide the separation and staging of the HD 660S2

[@yifuhood]

@@PassionforSound yes, where it is a subtle difference. But obvious difference, that immediately audible is spaciousness, neutral tonality and extension on both end of the r70x. to me natural tonality of the hd600 is worth a lot but the separation layering is at the cost of claustrophobic Sennheiser . what is staging without much a spacious sound. Maybe I'm wrong because I have not compared the hd660s2, but the rest of the HD6, I can speak to.

[@ryszardmazurkiewicz5048]

Pk I agree others are cheaper but how do you think ...because o think if the Sennheiser raise the prise for 660 s2 not without the reason...and All Reviews all humans you can break on corner of the ass ..becouse even one Important person from designer of sound stage of 660 s2 he or she knows something about the 660s2..that you never gonna be discover with your natural ego ...that's is the Cloe of this price...and remember this ki d company like Sennheiser they don't do some greedy things to make money...this is different level of existing in this World....

[@eiskalterorangensaft]

the sennheiser hd660s2 are very boring sounding, lack bass and clarity and its like there is a rough sheet of paper between the speakers, compared with the price of a hifiman edition XS its really really bad and a cashgrab.

[@PassionforSound]

I disagree overall. In terms of the HD 660 S2 not being exciting, I agree with that. I would still choose them over the XS though for comfort, tonal balance and soundstage depth.

[@AsgardsGlory]

After 6:20 I stopped listening to this nonsense. Resistance does not affect voltage. Didn't you go to school? Ohm's law? What does voltage have to do with headphone resistance?

[@ChrisStoneinator]

When did he say it affects voltage? He's saying shit amps don't have enough voltage to drive these headphones with enough *power*. Didn't you go to school? Ohm's Law? P=V^2/R as a corollary by the definition of voltage and current? Lots of amps can't always (or in some cases, ever) output the rated power because they can't put a high enough voltage across the output to do so if there's a high load impedance.

[@chefgav1]

Bruz what an embarrassing drunken rant