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Over-Ear item created by , May 5, 2010
Pros - Soundstage, Relaxing and Lush sound, Bass detail, Comfort for long sessions
Cons - Build quality looks cheap for the price tag
Awesome headphones. Perform a lot better with good amplification. Good for almost every genre of music. Bass response is already good, can get even better and tighter with amp. Extremely lush sound signature. You can spend hours with it without getting fatigued by sound. Treble, though sparkling, sounds bit rolled off but that's how they can be so relaxing to keep listening forever. Only area where these headphone leaves you feeling want more is build quality. Plastic used is strong but at the price tag doesn't justify the use of plastic.I really liked to see what Sennheiser done with Momentum they could have done similar with looks department of these headphones after all its almost 10 year old design.
Pros - full range performance
Cons - Bad headphone cable
If you can change the cable of HD650. You will find that HD650 is the best value headphone in the world.
Pros - Smooth Presentation, a linear, stout sound at louder volumes.
Cons - build quality is meh! Overall sound is too recessed and lacks weight
The praise that has been heaped upon the Sennheiser HD650 headphone is something that probably every headphone OEM envies. The HD-650 is nearly a decade old and yet is still viewed by many as a top tier dynamic, worthy flagship, and is the benchmark that many measure price to performance ratio against.
I personally was cruising along quite happy with my set up… Running almost exclusively between Denon D5000’s and Ultrasone Pro900’s. I felt I had the best of both worlds. Since I love the visceral impact of good bass in my music, these two pieces seemed to be perfectly tailored to my listening habits.
The Denon gave me a little more reasonable treble energy and a little less sibilance when I needed it for something more complex and diverse. While the Pro 900 gave me that sub woofer for your ear feel that just flat out slams your ear drums. With a decent DAC/ desktop amp set up I am usually able to apply a 6kHz to 8kHz cut to smoothly equalizes the sound to eliminate that “ESSS” sounding ear razor that the Pro900 is so infamous for.
However somewhere along the way the constant gushing over the Sennheiser HD650 got to me. Specifically Mike from Headfonia repeatedly claiming that it was the ultimate king of bass impact…. He never said king of bass quality, quantity…. He always spoke of the HD650 in terms of “Impact”.This should get just about any hard core and well funded bass head’s juices flowing and so I began looking at the viable options for acquiring this apparent low frequency giant. And so after parting ways with most of my portable equipment, I was flush enough with cash to purchase my own set of the venerable HD650.
I will start out by saying that because of all the talk of the ‘luscious mids’, smooth highs and world class low frequencies my expectations with this headphone were near off the chart…. I have since done the same thing with my first attempt at the Audeze LCD2. The LCD2 albeit a very good headphone, was so overblown in my mind that by the time I actually listened to it, I was disappointed. That had far more to do with my overblown expectations than anything... because second time around... being aware of how much darker the LCD2 was than its Hifiman counterparts.... I have found a place for the LCD2 in my stable.
But by the time the Sennheiser headphone had finally arrived, it was competing with dare I say unrealistic and extreme expectations and was pretty much behind the 8 Ball from the start.
Build & Design
The Sennheiser HD650 is certainly a dated design. There are dozens of headphones on the market in the same price point that are better dressed. Most $500 headphones have premium materials such as aluminum, leather and wood worked into the build. The Sennheiser headphone is almost exclusively plastic. It is a shiny, cheap feeling plastic on virtually every exterior surface sans the grill, ear pads, retainer ring and bottom of the headband. Detail items like the "Left" and "Right" indicators are simply cast into the grey plastic.... This build quality seems unfit for a legacy flagship.... Obviously its been a long time since this headphone was brought to market and Sennheiser was working in the pre-Beats era, long before headphones were valued as a fashion accessory and long before OEM's thought they could bring flaghips to market with price tags north of $1000. Sennheiser's HD800 and HD700 show they clearly can design a top tier headphone both in sonic character and design quality, but the HD650 is still asking $500 USD and doesn't give you a warm and fuzzy out of the box once you've got it in your hands, at least it didn't for me.
The headphone is extremely light. Many in the community would give it points for this and they are certainly entitled to their opinion. However I personally see this as a demerit. Speaking strictly in terms of assessing an items value from a subjective/ aesthetic viewpoint, the Sennheiser headphone appears to be made of cheaper, less durable materials. I am not going to strain my neck if a headphone is north of 400 grams. The Hifiman HE400 weighs in at a hefty 440 grams and is perfectly comfortable to me, the Denon D5k weighs in around 360 and is probably the most comfortable headphone I've ever worn. If one is spending $75.00 on a beater set of portable cans, an expendable gamer headset or a cheapie like Superlux or Porta Pros (of which I am a fan) then by all means they should be and can be as light as a feather and made almost exclusively out of plastic without raising eyebrows. But at $500 out the door for a would be flagship headphone that was intended for listening at home or in a studio through a serious system... I don’t know.... I expected something more substantial.
The crux of this featherweight value is that in order to keep it properly seated on the listeners head, Sennheiser had to crank up the clamping force. Otherwise the light weight construction leaves it prone to moving too easily as it has little resistive value on its own. The clamping force is something that many have commented through the years as a supposed 'death grip'... Once again just like the HE400 won't snap my neck, the clamping force on the HD650 is not going to crush my skull. It is certainly wound a bit tighter than most, but I personally believing the clamping force has been measured perfectly to counteract the lightweight construction's tendency towards moving easily. It is a goldilocks value.... not too much, not too little... Just right. This is a nod to the design engineers.
Right off the bat my delusions of grandeur were dispelled. It is certainly nicer looking than its faux marble clad brother the 600 however as a supposed flagship headphone of such universal praise, I was underwhelmed by the look and build quality. Those who think this is immaterial are kidding themselves.... Aesthetics have value to the consuming public and audiophiles are most certainly not immune... The hifi world is littered with glitzy machined aluminum tone arms, satin metal surrounds for tweeters, anodized aluminum face plates with machine metal knobs, high gloss enamel finishes, lustrous wood side panels, frosted glass.. etc....etc...
The die-hard says that this is simply an indicator that they chose to pour all their cash into sound quality. OK maybe this is true.... lets see.
Hook It Up! And Wait.
I did not want to be hasty with a plug and play attitude as I had heard that the out of the box, plug and play sound of the HD650 was disappointing (I heard this about 10 hours after I purchased it sadly) but that a 100 hours of burn in would get you a somewhat matured sounding headphone, so onto the vintage Realistic 64B it went. This older vintage rig is hooked up in a file cabinet at work and so can burn in a headphone out of site and outta mind while I still enjoy music on my main headphone rig…. A Violectric V100 tethered to a Laptop running JRiver via my Rega DAC with a Wyred 4 Sound uLink handling conversion duties to SPDIF.
100 Hours - Impressions
After it had burned half the day on Thursday and all day Friday, Saturday and Sunday by the time I got in to work on Monday the 650 had clocked roughly 96 hours of burn in time. I plugged it into the Violectric V100 and listened to some newer redbook CD rips. Muse 2nd Law, Foo Fighters Wasting Light, and Gaslight Anthem The 59 Sound.
The HD650 is not a bass head can. That is my first impression. Where the hell is this supposed ultimate bass weight?
A couple of local Head-Fiers down here in the Southland told me the 650 was really amp picky and that I would do better with a tube amp like a Woo WA6 or Bottlehead Crack. However my headphone amp is a Violectric amp which is what Sennheiser uses in their “Hall of Fame” set up and is one of Sennheiser’s Senior Project Manager Axel Grell's favorite amps for his own listening. A couple others mentioned changing the cable to a Cardas one, and one guy said I might need a different DAC to get the most out of it.
So in order to get the Sennheiser HD650 to sound good what I needed to do was:
Get a different amp
Get a different cable
Get a different DAC
Maybe I should get a different source, different interconnects, a new power conditioner and stop using CD's while I am at it eh? Mind you I do see where some could see this headphone as all they need and build out their entire system around it.... searching for another .5% of improvement with each piece of the puzzle... but I have already built my system(s) and am not really inclined to do a whole lot of kit rolling in order to optimize the synergy with this lone headphone when I have a half dozen others that sound fantastic through the rigs as is.
So my immediate disappointment with the bass could’ve derailed this whole review. I was expecting Pro900 bass or Denon D5k bass without the 7khz ear razors or recessed mids... What I got was an all too polite rendition of EVERYTHING.
The low frequencies are extended, there is textural information galore, you can really hear the stick or the tom on the drum skins, the full decay of bass strings, mid range is sweet and smooth, and there is plenty, and I mean plenty, of high frequency detail and sonic information. Anyone who says the HD650 does not have enough treble energy or detail is, to these ears, not hearing straight.
But that ultimate bass weight, that Mike implicates all the time, it is not here IMHO.
The low frequency, midrange and treble are all recessed quite a bit. They do not hit you in the side of the head with impact. They don't even touch you. If this is what people are speaking of when they say the 650 is veiled then yes, it is veiled, but not in the sense that a certain portion of the frequency range is somewhat blurry or hidden.... Its more about air pressure that makes a headphone felt as well as heard. Open architecture does limit this but I've heard better open backs at giving you punch.
I will hop on my soap box right here and say that one part of a headphone experience that is vital to me, is the overall weight of a headphones tone. I am not specifically talking about bass extension or articulation or even the bass frequencies in particular. What I am saying is that headphones with a tonal density to them…. A robust acoustic mass that move some air pressure to bring the music more to life…. That is critical for enjoying music in my book. Otherwise it sounds like music but doesn't feel like it.
It may not be critical for monitoring, mixing or mastering in a studio, or DJing or even for being an audiophile who wants to sample 24/192 and DSD audio tracks like they are a damn 10 year old Pinot Noir… but for the average Joe like myself who wants to simply strap on a set of headphones, cue up an album, hit play, sit back and enjoy some music…. The overall presentation doesn’t need to be “forward” but it needs to be felt as well as heard.
Oldies like Buddy Holly, Sam Cooke, and Bob Marley all have strong drums and bass rhythm that is presented most natural when the full weight of the instruments is presented... the kick drum and bass line at the opening of Dock of the Bay sets a strong foundation for Otis and the guitar to build off of. Alternative music like Smashing Pumpkins, The Pixies, Jawbreaker, Dirtbombs, and Blur all have bass and drums that need punch. Punk rock and other guitar driven music like Social D, Operation Ivy, Van Halen, Bad Religion, The Ramones, Rancid, The Strokes, Vampire Weekend, Weezer, Gaslight Anthem.... they all have rhythm sections, and natural timbre that is presented best when it is presented with a fully developed full bodied sound.
Most people would rather listen to music through a great set of speakers because the music can be felt in your bones and people go to concerts because the live performance trumps every other experience. I saw Muse at Staples Center a month ago and the bass and drums absolutely rattled my bones.... Just vibrating you right down to your soul. And that is why 50,000 pack stadiums every night to see performances. Because the music overwhelms your senses. I saw the Ramones in Santa Barbara in the early 90's and it was the loudest show I've ever been to... Large Marshall double stack cabinets for both Dee Dee and Johnny and Marky's drums were mic... all in a small club (The Anaconda for anyone who cares) and the Ramones play tight so it was just a full on sonic assault.... transcendental to a young kid and still the best show I ever saw.
To me, listening at home through a set of headphones should be a tamed extension of that experience. Obviously headphones can't give you what a live concert can... nor can they give you what well crafted speakers can, and speakers can't give you what amps and guitars and mic'd up drums can.... but each should have a measure of the other. The HD650, although tonally sweet and smooth and carrying some weight in its tone is similar but a bit more recessed than the Audeze LCD2, it just holds you too far back from the music FOR MY TASTE. It left me wanting for something more!
The HD650 often gets the compliment that "I could fall asleep with these on" and that to me sums up the HD650 perfectly.... It's kinda boring.
The HE400/ HD650 issue.
I’ve had a few people ask me which I prefer. The HE400 has a little more low end punch and the extra growl and mid range power makes it a better choice for my taste. Speaking strictly in audiophile terms the HD650 has the better acoustic chops. Its professionally damped driver fills out more evenly and more linearly but this linearity is still comes out anemic compared to the more live sounding Hifiman. .
At lower listening levels the HE400 is a far better choice. It gives you a tad more flesh to sink your teeth into. A bit more punch in the low end and a live wire mid range that’s tipped up just enough to make rock music sound amazing. But as we travel up the volume ladder the Sennheiser becomes more stable and stout in its presentation, everything fills in evenly. The lows get stronger as the mids get sweeter etc... The HE400 although good to a point, can get crispy and its budget level planar membrane can start smearing tones and blurring separation on complex electronic fare where 100 or more different sounds are sometimes dubbed over the top of each other. The Senn is more resolving and surefooted through big sonic waves but like said, anemic... I could live with either, but if I could only have one, it’d be the 400. Even though it tends to get a little distorted when it is under powered and doesn't have that furthest reach of resolution. It's rock and roll presentation is more enjoyable.
Johnny Come Lately – The X1 P
Phillips open back X1 is priced a hundred short of the 650. But there are obvious similarities. Open back design, midrange price point. But one would assume that its beautiful aluminum cups, velvet ear pads, and leather headband come at a sonic price.
The X1 is a gorgeous looking headphone. Along with my D5000 and LCD2 it is one of my most sartorially minded. People like to contrast it against the Sennheiser Momentum…. No, the Momentum looks flimsy build and doesn’t hold a candle.
Next to the X1 the 650 looks very dated. The plastic finish is a glaring shortcoming up front for a headphone asking $200 more. The 650 is the technically superior headphone. For the same reasons the HE400 can't play this game the X1 can’t either… It doesn’t have that same surefootedness and linearity that the Sennheiser does, nor does it scale as well. But the X1 has a more rich and nourishing tone that will appeal to music lovers and bass heads alike. Its bass slams harder, it's musical vibe is just funner. It can also get a little crispy and sibilant in the upper register when volumes start creeping up whereas the 650 never breaks form. The Sennheiser is still the “better” headphone. But for a music lover like me I am not sure how important that is. Lately the X1 has been getting a ton of head time and that speaks to its engaging tone. It gives me that 'felt as well as heard' sound that I crave.
VS. My Favorites
Against both of my closed back favorites, the Sennheiser plays the same song. It is linear, well engineered, accurate and anemic. The Denon D5k and JVC DX700 are simply more dynamic more emotionally engaging, and immerse you in the music. They surround you in an envelope of tone.
The punch is there with both, but the JVC DX700 ups the ante by giving a sound stage worthy of an open back phone and providing not quite as linear but still fairly linear sound as things get louder and louder. I would choose the Denon and the JVC DX700 over the 650 every time. It simply doesn't give you as much of the song as they do. It is truncated in its presentation it sounds thin and lifeless compared to the two Japanese headphones. They are just too well rounded, dynamic and potent for the 650 (IMHO). They don't give anything away.
Contrasting against the Japanese duo, the Sennheiser strikes me as the stuffy middle aged guy rocking a corporate polo, khakis and cheap patent leather shoes. He presents well enough in professional circles but doesn't really have the personality to charm. The 650 is the middle aged, mid level cog in the machine. The D5k and DX700 are sharp dressed 20 somethings from Tokyo with Italian cut suits and crepe sole oxfords. Their resume may not be as thick and they may not have the same number of professional accolades but they are dynamic, engaging and charismatic. They offer excitement and future glory that you will not find with the hum drum late 40's something sitting with his shoulders slouched in the lobby.
WRAP IT UP!
In closing the Sennheiser is by most normal youthful standards a little light in the ass. Some would call that a veil or laid back but it’s not laid back to me… That denotes a mellow, relaxing sound and a veil sounds like the treble is shelved down or certain parts are blurry. No this is about sound pressure levels. Air being moved by transducers. This is about 2 dimensional accuracy vs. 3 dimensional involvement.
The caveat to that would be in a full size stereo rig.... In those scenarios the 650 sounds a lot better than most modern 32 ohm headphones.... The only 2 in my collection that best it on the integrated amp scene are my planar headphones... both of which have flat phase response and so don't do the poorly damped thing.... But in a typical dedicated headphone setting.... to me, the 650 is a bit boring. You are held back just a bit too far from the song to truly enjoy it. I dare say that the hype may be a bit overblown….. at the very least it does not line up very well with my taste.
Mind you I didn't write this review to deride anyone who loves the HD650.... and I'm sure those of you that are fans of it will continue to enjoy it. But I do think there are a lot of people running around this site looking for answers, not wanting to spend their hard earned cash poorly.... and most people use this site to inform their future purchases. Because of some of the descriptive words I have heard people use, I think someone could get the wrong idea about the sound of the 650... when people call it dark, warm and full bodied.... I don't know that these words do the phones tone justice. At least not without building your entire system around the HD650. Contrasted against the greater landscape it is a bit light and lacking in body. Someone needs to say that.
So I hope I do not get flamed but I think that someone out there deserves to get a little objectivity on this headphone rather than just more gushing about "greatest ever". No I am not a Beyer or AKG fan boy going subterfuge.. I am just an average consumer with average taste and listening habits trying to give others like me some reasonable perspective.
I suppose if you dedicate all your resources to just this one headphone, you can make it sound spectacular.... But to the average head-fier who has the same low riding, subwoofin tendencies that I do. Who listens to Muse, Foo, the Black Keys, Gaslight Anthem, The Strokes.... modern music.... this may not be such a strong fit.
Pros - Highly Modifiable and Organic (when paired with a great amp)
Cons - Out of the box, not the best experience
When I first got my HD650s about 5 years ago, I have to be honest and say I wasn't thrilled. Listening to them over my DAC for the first time gave me a bad first impression. I purposely loaded my vinyl transfer of The Police's "Every Breath You Take" because it has a good balance of punch and snappy low, mid and high frequencies (again, I'm talking about my vinyl transfer, not the Remastered for CD version).
I was unimpressed by the lack of "WOW Factor" that I had heard from other users/reviewers. My DAC is a high-end Crane Song Avocet which has a very good solid state headphone amp built in. I then read about how these need a few hours of burn-in time, a concept that I wasn't sure was true, as other headphones I own have sounded the way they do out of the box; this was the first headphone purchase I made where burning in was a factor.
Skeptical about this phenomenon, I decided to run pink noise while at work for two weeks straight, without listening to music during the entire burning period. After the two week burn-in period, I listened to the same song again and this time there was a noticeable difference in how wide the stereo image sounded. The low frequencies sounded more extended, but I still felt the mids and highs (especially the high frequencies) were just not as present as I've heard them on some of my other cans (Grado SR80s, Sony V6s, AKG 240DF). The other headphones don't reproduce the low frequencies as good as the 650s, so for a while I wrote them off as having a general weakness in the mids/highs.
Over the next few months, I listened to all kinds of music with them and slowly began hearing about the "foam mod" and wondered if it would make a difference. I didn't want to risk damaging them, as the smaller foam disc inside each of the drivers doesn't seem like it can go back as it's sandwiched between two layers of plastic that cover each of the drivers. I decided to do this modification, because frankly, I wasn't listening to the 650s as much as I wanted to. After removing the small piece of foam from each of the drivers, I immediately noticed an improvement in the lows and mids; the lows had less "mud" and I was able to hear more detail in things like snare drums and hi hats. The next modification was the cable, and I decided to build one using the Cardas plugs, Canare Mini Star Quad and terminate it to a 1/8" Canare plug. Being able to remove the stock plug easily through the connectors gave me the ability to see if a cable upgrade really does make a difference, and it sure does! I gave up the flexibility of the stock cable, because the heavier cable is shorter and less friendly to moving around, but I noticed immediately that the sound stage improved a bit and I started being able to pick apart elements of the audio in ways I wasn't able to before.
The only thing I still wasn't satisfied about after the foam mod and cable upgrade was the high frequencies, until I listened to these through the Schiit Valhalla. I think the tubes on the Valhalla somehow have improved the upper frequencies on these headphones. When I listen to my Grado SR80s through the Valhalla, they almost sound too bright, so maybe the amp (and stock Schiit tubes) bump up the higher frequencies, it seems like it to me, and I think this bump works extremely well for the HD650s!
It took me a few years to find a combination that has transformed these into a beautiful listening experience; out of the box, they simply don't perform to their fullest potential (they definitely are picky when it comes to an amp, and I would try them on a valve amp as opposed to a SS amp for the full experience!) I bet many Tube amp enthusiasts are having a blast with these and rolling tubes! I'm honestly perfectly happy now with these and the Valhalla.
Pros - May not be the most neutral or most transparent but will be the most listened to.
Cons - Doesn't look as good as it sounds.
The HD 650s do just about everything right. Extremely forgiving yet detailed, it makes all music sound gorgeous. Absolutely dreamy, you'll find yourself lost within your music. Much of the sound attributes have been said before, e.g. the warmth and laid-back signature, so all I want to say is that if you ever had to buy a pair headphones solely for the enjoyment of music, pick the 650s. It's an absolute bargain at it's current price.
My only complaint is in aesthetics. If only it would look as beautiful and elegant as it sounds. Although, not really a complaint as the sound takes precedence and it's really not that ugly. Could use less plastic though.
Pros - never harsh sounding, no sibilance, easy to listen to, detailed yet not harsh
Cons - too much midbass, dark sounding, warm sounding, veiled sounding
I don't like this headphone. Or rather I don't enjoy this headphone. But I can't deny it's impressive.
Plagued with the typical Sennheiser problems of being built cheaply and being overpriced, yet it's really the only in its class, the audiophile's favorite.
That warm and dark sound, that you can never get tired of. That impedance curve that makes it scalable. This is the audiophile's dream, it may not be relevant today with all the FOTMs but it still remains a classic. Grab one used from the classifieds if you're into this kind of sound.
As someone who is into accuracy, it was natural that I prefer the HD600... the HD650 was too thick in the mid-bass and lower midrange and the highs was rolled off, but the roll off wasn't really bad as the clarity is there, but the veiled like sound comes from the mid-bass and lower midrange.
Some complain that it's slow, I disagree, it's pretty clean and fast, but not harsh. Technically impressive, very low distortion.
Pros - Superb sound-stage, amazing lows, crisp highs, comfortable for extended listening sessions, aesthetically pleasing.
Cons - Design and materials could be better. A metal reinforced headband would have been preferable. The amp you use can make all the difference in the world
I have only had these headphones for a little over a month at the time of me writing this review. I choose to write the review now because I feel confident in my ability to properly asses these headphones from an objective point of view with minimal bias. This review was written at work over the course of a shift, it is by no means well layed out.
First off....These headphones are understandably flat and dull when used without an amp, anyone expecting auditory greatness (Over the Ear) from a 3.5mm jack running off of your phone is insane.
What I listened to on my HD650s: Classical, Rap, Rock, Classic Rock, Metal, Death Metal, Melodic Death Metal, Symphonic Death Metal, Alt Rock, Dubstep, Trance, Jazz, Techno, Pop, Progressive Rock, Progressive Metal. Television shows, Movies, PC games, Skype conversations.
Quality of source material: Primarily 16-bit 44KHz ALAC, Vinyl, 24-bit 96KHz FLAC
What powered my HD650s: Tested on 2 amps at home in addition to my portable amp solution Fiio e17
Use: 6-8 Hours a day for a little over a month at home in chair/bed, walking, and even in my car.
Experience: Easily the best headphones I have ever owned. The bass response is superb and will lull your ears into nirvana. The highs are crisp and distinct but never feel like they are stabbing your ear canal. I decided to test MP3s with the HD650 and was astonished at how 320Kbps tracks were sounding through these cans. No where near perfect, but damned impressive for the source material. I listened to music the most sitting in my lazy boy chair at my computer or laying in bed. I have actually fallen asleep listening to these headphones, they are really comfortable.
Conclusion: This review was kind of sloppy, but I can easily recommend these cans to anyone looking for a delicious audio experience. AMP MAKES ALL THE DIFFERENCE
Pros - Great smooth, lush beautiful sound, very balanced and relaxing. Quite detailed. Dark. Very comfortable
Cons - Build quality
I love my HD650 for rock, jazz and weightier orchestral pieces. The sound is very detailed but somehow dark (which is good with some recordings). This headphone never sounds obtrusive or hard. It is very comfortable. I have it as a companion to another great headphone, AKG k701, and they work great with their parts of my record collection.
Pros - Excellent sound at the price. Much improved sound stage vs lesser headphones. Very comfortable for long listening session.
Cons - Could be more detailed & in-your-face
These are a great pair of cans all around. Very few complaints. Fantastic value. I've been driving them with E17 / E09k - it may not be perfect but it sounds great to my ears!
These are the kind of headphones you forget you are wearing because they are so comfortable. The rolled off treble is great for long listening sessions.
I find that I tend to use them when I want my experience to be a little bit hands-off. The sound, the feel, etc. is all very comfortable. The bass is a little bit underwhelming, but it fits the 'comfortable' experience. They are nonetheless quite detailed. They aren't bad at really low volumes, but I am more likely to reach for my grados if I want really low listening volume with clarity.
The build quality is quite good. I am worried about the paint chipping though.
They are a massive step up from entry level headphones and IMO about 75% of the way to hi-fi headphones (e.g. LCD3).
In my opinion they work quite well with all genres of music, but are a little bit too laid back for rock.
Pros - Comfort, Build Quality, Detail
Cons - Open back lets in noise, after hearing them with an amp. you'll have to drop another $300+
Just got a pair of these for Christmas and have to say that I was very impressed with the box they came in, very solid packaging, and neatly organized cord. There is a 3.5mm adapter included in the box, something I was not used to coming from a pair of Grado SR225i cans.
The build quality is very good, I don't feel like I will scratch or dent them without a decently high tumble. The cord is detachable and feels like it will not likely give out anytime soon.
As for comfort, I never really found my old Grados that uncomfortable (I know you guys/gals on Head-fi and reviews on Amazon always talk about Grados being uncomfortable) but now I can hardly wear them after having used the HD 650s. It is a very comfortable fit once you get them adjusted nicely to your head.
As for sound quality, I play everything in FLAC or MP3 @ 320kps using Foobar2000 with the kernel streaming plugin.
Due to the fact I don't have my Maverick Audio TubeMagic D1 Plus Edition in yet, I have been trying to use the 3.5mm jack from my laptop to listen to music. The HD 650s don't sound very special through that source at all, they are very boring when plugged up to my android phone as well. I almost picked up my Grados again just until my amp came in, but I just like the feel of the HD 650s so much more.
I eventually used HDMI out from my laptop to my harman/kardon AV receiver along with Foobar2000 w/ WASAPI (manually selecting the receiver in the output list) and plugging my headphones into it as a source. This made the headphones sound much more worth their money and really blew me away.
Music I tested included Pink Floyd, The Beatles, Led Zeppelin, Daft Punk, OutKast, The Chemical Brothers, Kanye West, and Fleetwood Mac. I heard details in Time by Pink Floyd I have never noticed before.
I am very excited to get my Maverick Audio TubeMagic D1 Plus Edition in. My library is waiting for me to listen to everything over again.
If anyone wishes me to report in how the D1 sounds as a source for these cans let me know in the comments.