Sennheiser X Massdrop HD 6XX

General Information

If you know audio gear, you know the Sennheiser HD 650. The company’s flagship from 2003 to 2009, this open-back headphone has shown serious staying power. Praised for its richly detailed, effortlessly enjoyable sound, it remains one of the most talked-about products on Head-Fi today—and is still widely considered among the best headphones under $1,000. So when we teamed up with Sennheiser on its first-ever community-driven design partnership, the HD 650 was a natural place to start. A new revision of the popular all-rounder, the Massdrop x Sennheiser HD 6XX has that same great sound plus a few updates, and a price that makes it even easier to love.
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Animagus

Reviewer at Twister6
A timeless classic Sennheiser headphone that slays even today!
Pros: One of the best value open-back headphones.
- Timeless attractive design, build quality and fairly comfortable fit.
- Natural neutral-warm well-balanced reference-ish sound signature.
- Excellent midrange quality with natural tonality and timbre of instruments,
- Smooth but resolving treble.
- Instrument note weight and definition.
- Instrument realism.
Cons: Clamp force is slightly tight out of the box.
- Slight sub-bass roll-off at 40Hz.
- Treble becomes more laid back as stock ear pads wear out.
- No carry case included.

Disclaimer.

I'd like to thank DROP for sending me the Sennheiser HD6XX for a review. I am not affiliated with the company or any of its sellers and write this review with an unbiased opinion regardless of how the review turns out.

About HD6XX.

HD6XX was born out of a collaboration between DROP (previously Massdrop) and Sennheiser as a revision to Sennheiser’s highly acclaimed flagship of six years - HD650 (2003 to 2009). With the development of HD6XX, they made some minor aesthetic changes like a deep midnight blue paint job, black nameplates with silver text and Massdrop logo silk-screened inside the headband but tried to keep the original sound of the HD650 intact. Based on feedback from the community, this iteration was also updated with a detachable 6-foot cable (compared to the original’s 10-foot cable) and a 3.5mm plug, which is more versatile for everyday laptop, phone, and DAP use than the standard ¼-inch plug. A ¼-inch adapter is included for those who want it. Like all headphones in Sennheiser’s HD 600 line, HD6XX too can be disassembled by hand to its component parts, all of which can be easily replaced. Many of its parts are interchangeable with others in the series and owners of the HD 6XX can benefit from the rich aftermarket and brain trust of modifications and gear matching.

Links - DROP x Sennheiser HD6XX ($220) | DROP Earpads for HD6XX

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Technical Specifications.

  • Color: Midnight blue
  • Transducer principle: Open-back, dynamic driver
  • Frequency response: 10 Hz – 41 kHz
  • THD: < 0.05%
  • Nominal impedance: 300 Ω
  • Cable length: 6 ft (1.8 m)
  • Connector: ⅛ in (3.5 mm)
  • Weight without cable: 9.2 oz (260 g)
  • Made in Romania

Included in the box.

  • Sennheiser HD6XX
  • 3.5mm cable (6Ft)
  • 3.5mm to ¼” adapter
  • Manuals and warranty card

hd6xx-box.jpeg


Build Quality and Design.


HD6XX’s body is mostly made of plastic with the headband adjuster being the only metal part in there but is put together very well owing to Sennheiser's manufacturing prowess. I’ve always liked the design of the HD600 range in general and the HD6XX is no different. The midnight blue colour looks almost like black and I’m definitely not complaining. The open back grill and the exposed driver look of the HD6XX is a timeless design, eye catching even today and puts HD6XX up there as one of the best-looking headphones in its price range. The headband adjuster is a bit tighter than I like but in turn works well to keep the headphones firm where you set them without the adjuster dropping down loose on its own. Besides that, I really have no complaints.

Cable – Right up, I’m not a fan of HD6XX’s cable. It’s rubbery, cheap looking and too long! Besides that, it does its job and works. Drop and Sennheiser should definitely put in a better-quality cable, even better if they can offer a nice balanced cable as stock.

hd6xx-solo-2.jpeg

Fit and Comfort.

The fit for me is pretty good as the headphones are light, the ear pads cover my whole ear and are padded enough for my ear to not touch the driver assembly. The clamp force is slightly on the firmer side right out of the box but there is a popular trick to slightly bend the headband adjuster towards the outside to reduce a bit of the clamp force. The clamp force is fine for me if I’m using the headphones for short durations but I do start feeling it after a while. I might try the headband flexing trick once I get over my fear of breaking them while doing so. Lol!

Sound Analysis.

Drivability - HD6XX has an impedance rating of 300Ω and needs a bit of juice to be driven to decent levels. I could drive it to a decent level with my Oneplus 7 Pro phone and MacBook Pro laptop by maxing out the volume but it sounded much better with my DAPs and audio interfaces. You should easily be able to drive it through the SE output of your DAP but I highly recommend getting a balanced cable for the HD6XX and using more quality power available from the balanced outputs. Also, it is popularly known to scale even better with good quality desktop gear and good portable dac/amps. I tested the HD6XX mainly with the SE and balanced outputs of Hiby R6 2020 & iBasso DX160 as well as the headphone output of Universal Audio Apollo and Focusrite Clarett 8PreX audio interfaces (while testing and using it for my music production work).

hd6xx-studio-1.jpeg


Summary – HD6XX has a very natural, well-balanced, warm sound signature with very good tonality and timbre of instruments. It has a mostly neutral bass presentation except for a minor sub-bass roll-off around 40Hz and a tiny 2-2.5dBs boost in the 80-200Hz range. It has extremely well-done midrange which is its main USP; it being linear, neutral and almost perfectly tonally accurate. Lower treble is natural, easy to listen to without any harshness or sibilance. Upper treble extension is fairly good with a prominent peak at around 15kHz. Overall, HD6XX is one of the easiest headphones to get along with because of how natural, comfortable and well-done the sound signature is.

Let’s dig in deeper…

Bass – HD6XX has a mostly linear and neutral bass presentation. Being an open-back, it comes as no surprise that it has a minor sub-bass roll-off of 1-2 dB slope starting around 35-40Hz but because of it being relatively minor, it plays sub-bass till 20Hz decently, just not with a lot of rumble. It has a tiny bass boost of 2-2.5dBs in the 80-200Hz region which adds a bit of punch and excitement. This boost sometimes adds a tiny bit of bloom in some songs which already have a bass boost in this region but I’d still classify the overall bass presentation as fairly neutral and well done in general. Overall, HD6XX’s bass is tight and has good speed, clarity and note weight. Even though HD6XX is tuned more towards neutral, it presents bass in most songs in a very musical way which generally brings a smile on my face.

Mids – Midrange is what HD6XX does really well, in fact exceptionally well considering its asking price. Lower midrange is very clean, neutral and linear while the upper-midrange has a very natural reference-ish forward presentation with good ear gain and peak presence at 3kHz. It has very accurate tonality and timbre of instruments which makes HD6XX sound very natural and realistic. It is fairly resolving and well-layered, especially for its price.

Treble – HD6XX’s treble is well balanced and more neutral with fresh ear pads but starts becoming smoother and more laid back as the pads start to wear and deplete. So, if you want to keep HD6XX sounding its true self, you'll have to switch out the earpads as soon as you start noticing the treble getting smoother or the earpads showing signs of wear. Lower treble in general is rich and smooth without any harshness or sibilance. It has good upper treble extension till 20kHz with one prominent audible peak presenting itself at around 15kHz but it isn’t the most sizzly, revealing or airy upper treble. As a result, HD6XX makes for a rather nice, musical, warm and comfortable listen but resolves nicely with good detail retrieval. It’s the good kind of neutral warm and not dark by any means (at least in my opinion) and that makes it a good fatigue free headphone for longer listens and long hours of production work.

Soundstage and Imaging - HD6XX has a decent soundstage but isn’t as wide as what you’d unknowingly expect from its open-back design. It is more realistic in the sense that it is lets you know that you’re listening to headphones but isn't intimate or claustrophobic by any means. It is bigger than most closed-back headphones I've tested in its price range. HD6XX images decently well for its price bracket with fairly good separation between instruments but isn't the sharpest or most accurate at imaging in its segment.

hd6xx-solo-1.jpeg

HD6XX for music production.

HD6XX has very good resolution for its price segment and portrays instruments in the mix with good realism. I’ve used quite a few headphones in my career as a music professional but have always felt confident having a Sennheiser HD600 series headphone around in the past when working on guitar, bass or drum tones because of how naturally and realistically HD600 series headphones are able to recreate the image, tonality and timbre of the instruments with good resolution. HD6XX is no different in this regard and I found myself using the HD6XX more and more for my production work than others. HD6XX isn’t a headphone that boosts treble like crazy for detail retrieval but in fact does it with technical capability and tuning while maintaining a warm and easy sound signature that helps in keeping long production hours and listening sessions fatigue free.

DROP earpad options for HD6XX (link).


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Sheepskin Leather.
Fit -
Lesser clamp force, more comfortable.
Sound - Darker, boomier and fuller lower-mids.

Fenestrated Sheepskin.
Fit -
Even more comfortable, more breathable, lighter feeling.
Sound - Not as dark sounding as Sheepskin, lesser fullness in lower midrange, slightly more treble than Sheepskin but still darker and boomier than stock ear pads.

Hybrid Velour.
Fit -
Very comfortable, much better than stock ear pads.
Sound - Lesser bass slam, midrange is a bit boxier than Fenestrated Sheepskin, smallest soundstage.

Overall, HD6XX sounds best with the stock Velour ear pads. Unless you want to try the other earpads for better comfort, I’d recommend sticking with the stock ear pads for the best tonality and sound signature.

Comparisons.

I’ve compared the HD6XX to headphones I think are fit for a comparison based on style of tuning and price segment competition, regardless of driver type or style of headphone.

Sennheiser HD560S ($200) – HD560S is another open-back dynamic driver headphone from Sennheiser around HD6XX’s price point, selling for around $200. Build wise, HD560S is all plastic too (except for the metal grill) and is very well put together but I personally dig HD6XX’s design and build a bit more. HD560S has slightly less clamp force compared to HD6XX but I find them almost equally comfortable for my head. HD560S has an impedance rating of 120Ω and is a smidgen easier to drive than HD6XX but not by much. HD560S has better sub-bass extension and is more neutral but HD6XX has better bass punch and upfront definition. HD6XX is a smidgen more neutral and fuller in the 250-500Hz region compared to HD560S which is slightly leaner there but the rest of their midrange character is rather similar besides that. They both have similar linear, neutral lower-midrange and forward upper-midrange with almost similar ear gain but HD50S is a bit more prominent in the 4-5kHz region. HD560S has more lower treble in the 5-9kHz and more upper treble in the 13-20kHz region, making it significantly brighter than HD6XX but isn't abnormally bright or harsh as such. I'd basically classify HD560S' treble as neutral-bright and HD6XX's as neutral-warm. HD560S has a bigger soundstage with more width and depth but HD6XX has slightly better separation, realism and note weight. Also, HD6XX's overall sound signature scales better with more power and better gear than HD560S. Yes, Sennheiser's own HD560S gives HD6XX some good competition but I think HD6XX holds its ground and comes up on top in quite a lot of things. In general, preferences and basic choice of flavour will play a major role in choosing one over the other.

hd6xx-vs-hd560s.jpg


HifiMan Sundara pre-2020 revision (~$350) – Sundara is a planar magnetic open-back headphone with an impedance rating of 37Ω and sensitivity of 97dB. It is fairly easy to drive from most devices but benefits from more power. I’ve included Sundara in the comparison because it too has a fairly neutral tuning and is a headphone enthusiasts generally have on their radar. Sundara has slightly less clamp force than HD6XX but is a bit heavier. Sound wise, Sundara is more a neutral-bright headphone compared to HD6XX's neutral-warm tonality. Sundara rolls-off sub-bass sooner at around 50-60Hz whereas HD6XX rolls-off at 40Hz. Also, HD6XX has a tiny bit more mid-bass presence. As a result, HD6XX has more bass punch and a bit more rumble than Sundara but Sundara has a more neutral mid-bass presentation. Both have linear and neutral lower midrange and forward upper midrange presentation but HD6XX does it more linearly, naturally and organically. Sundara has a dip in the 1-2.5kHz region which makes HD6XX a bit more tonally accurate in the region. Sundara has more presence in the 4-5kHz region and can come off as shouty to some. Sundara has more lower treble and upper treble presence than HD6XX. Simply, Sundara is slightly north of neutral in its treble presentation making it a neutral-bright headphone whereas I consider HD6XX as neutral-warm. HD6XX is more organic, warm and comfortable sounding whereas Sundara has sharper attack and slightly thinner tonality because of its brighter upper-treble tuning. Sundara has the bigger soundstage of the two but I find HD6XX’s overall imaging a bit more natural as a musician/music producer. Sundara has a bit more micro-detail retrieval, a lot owing to its brighter tonality but can be fatiguing for some in longer listens compared to HD6XX.

hd6xx-vs-sundara.jpg


Ollo S4X (€399) –
Both are open-back dynamic driver headphones but S4X has an impedance rating of 32Ω and is much easier to drive. Even though HD6XX’s build is quite good for its price, S4X’s boutique design and build quality seems more premium and attractive. Fit wise, HD6XX is fairly comfortable because of large ear pads that go over the ear properly but the headband can have a stronger clamping force for people with bigger heads. On the other hand, S4X’s auto headband tensioner mechanism and clamping force is more comfortable but the ear pads are smaller and do not engulf the whole ear comfortably. S4X has a much better looking and feeling cable compared to HD6XX. Sound wise, running both through the 4.4mm output of Hiby R6 2020 in low gain, S4X has better sub-bass extension whereas HD6XX rolls of around 40Hz. S4X has a bit more mid-bass and lower midrange body in the 250-600Hz whereas HD6XX is more linear and neutral there. Both do upper-midrange very well but S4X has a bit more note weight and definition owing to a bit more ear gain whereas HD6XX is a bit easier and comfortable sounding. When it comes to lower treble, HD6XX has a minor dip in the 6-10kHz region too but is not as dipped as the S4X and as a result, hi-hats and cymbals are a bit more prominent and better portrayed in the HD6XX than S4X. Both have good upper treble extension but HD6XX becomes more laid back as the ear pads start wearing out but is a bit more prominent in upper treble with fresh ear pads. S4X comes across slightly more even and warmer in upper treble presentation in comparison. Soundstage wise, S4X is slightly wider and deeper as well as has better imaging and layering across its soundstage.

ollo-s4x-vs-hd6xx.jpeg


Conclusion.

Let me put this simply – There is a reason why DROP has sold more than 125,000 units of HD6XX since its release and also why you hear stories of long time enthusiasts falling back to a HD6XX/HD650 after going through several much more expensive headphones. It’s simply because of how well-tuned the HD6XX is. HD650 was regarded as one of the best headphones ever made back when it was Sennheiser’s flagship in the late 2000s and HD6XX still carries that legacy very well even today against the current competition. Yes, it’s not completely devoid of flaws but it does way more things well than it faults. It has one of the best midranges and is one of the most natural sounding of headphones not just in its price segment but even $500 and further. Its treble is resolving but natural and smooth, which makes it a headphone that you can comfortably listen for hours. It doesn’t have a lot of sub-bass rumble but the rest of the bass presentation is quite pleasing in my opinion. It is not the easiest to drive and doesn’t have the widest soundstages of open-backs in its price range but scales even better on good gear and the rest of it is so well executed that it makes it one of the nicest headphones at its price point. All in all, HD6XX presents great value at $220 and is a headphone that is definitely not going to leave my arsenal until it dies on me. I can safely and easily highly recommend it!



Gear used for testing and review.

  • DAPs – Hiby R6 2020 | iBasso DX160
  • Audio Interfaces - Universal Audio Apollo | Focusrite Clarett 8PreX
  • Laptop – Apple Macbook Pro 15″
  • Phone – OnePlus 7 Pro

Reference Songs list.

  • Foo Fighters – The Pretender, Best of you, Everlong & Sonic Highway album
  • Coldplay – Paradise, Up in flames & Everglow + Everyday Life Album
  • Biffy Clyro - A Celebration of Endings & Ellipsis albums
  • Ed Sheeran – Thinking out loud, Bloodstream & Galway Girl
  • Dave Matthews Band – Come Tomorrow album
  • Dua Lipa – Future Nostalgia album
  • Chainsmokers – Somebody, Sickboy, This Feeling & Closer
  • John Mayer – Slow dancing in a burning room, Stop this Train, Say & A Face to Call Home
  • Gavin James – Always & Hearts on fire
  • Switchfoot – Meant to live & Dare you to move
  • Porcupine Tree – Sound of Muzak, Blackest Eyes & .3
  • Our Lady Peace – Do You Like It & Innocent
  • Linkin Park – Papercut, Somewhere I belong & Talking to myself
  • Maroon 5 – She will be loved, Payphone & Lost stars
  • Lifehouse – All in all & Come back down
  • Breaking Benjamin – Diary of Jane
  • Karnivool – Simple boy & Goliath
  • Dead Letter Circus – Real you
  • I Am Giant – Purple heart, City limits & Transmission
  • Muse – Panic station
  • James Bay – Hold back the river
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DallaPo

New Head-Fier
Neutral reference at an unbeatable price
Pros: good wearing comfort
tonal correct
neutral sound
price-performance
Cons: somewhat high contact pressure
extension at both ends
not particularly exciting
imaging
Rating: 8.6
Sound 8.7

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Life is not a rainbow-colored unicorn, so you can't really blame the HD6XX for trying to stay authentic.

Sound: 8.7
BassMidsTreblesStageImaging
8.5998.58.5

Handling: 8.5
ProcessingComfortEarpadsHeadbandWeight
9888260 grams

Total: 8.6
Price: 185 €


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Intro
DROP (formerly Massdrop) is in the end nothing more than an online shop. But with the subtle difference that they also put their resources into product development with well-known big players. In most cases, the aim is to revise or reissue an existing product, make it more cost efficient and thus make it accessible to a wider audience. Examples are the AKG 7XX, HIFIMAN HE4XX, or the SENNHEISER HD6XX, which is based on the HD650 in terms of sound and appearance. This is still listed at SENNHEISER for 459 €, but is available at Thomann for just under 340 €. Well, the HD6XX is available via DROP for about 185 € and that without big differences in processing and sound (if you can believe the manufacturer, since I can't make a direct comparison at the moment). DROP also produces on demand and therefore in different batches, hopefully with the same quality control. So the product is not available on the shelf, but only exclusively through DROP and therefore not permanently.
Soundwise you should be able to get something out of the SENNHEISER house signature, which is usually a bit more reserved and neutral, warmly tuned, at least when we talk about the H5XY and H6XY models.

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Handling
Keyword cost efficiency. The HD6XX, consists of a good 80 % of plastic. Only the reinforcement on the headband, which also allows the headphones to be adjusted to the shape of the head, and the back grills of the ear cups are made of metal. However, the HD6XX does not make a cheap impression, because the workmanship is of high quality and no production errors or rough tolerances can be detected.
The earpads have a velour cover (which crunches a little bit with glasses), which encloses the complete ear and fits very securely due to the (a little too tight) contact pressure of the housing.
On the headband there is a foam padding, which prevents pressure pain as far as possible and allows wearing the headphones for a long time.
The wearing comfort is therefore good, but somewhat limited by the high contact pressure and the somewhat spartan padding on the headband. I prefer a flexible headband.

The accessories are reduced to a minimum, i.e. a 3.5mm cable (1.8m) and an adapter to a 6.3mm jack. The cable consists of two quite thick strands (left/right), which are led parallel. The connection to the headphones is done via a 2-pin connector (both sides). With the detachable cable you have the possibility to use the HD6XX balanced, whether with an adapter (25 €) to MMCX, or 2-Pin 0.78mm (a balanced cable to 4.4mm, or 2.5mm is required), or with a quite expensive balanced cable directly from Sennheiser.
We don't get much, but we get the most necessary, which is quite sufficient in terms of price. Here, the headphones themselves are clearly in the foreground, and even without accessories, the price would justify itself for me.

One cannot speak of isolation due to the open construction, which makes the HD6XX only suitable for public use to a limited extent, whether on the street or in the office.

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Sound
Bass

The bass is quite linear, with a slight drop in the subrange. Therefore, it is more emphasized in the mid-bass without being exaggerated, but still close to the neutral ideal. I would like to see a bit more punch and firmness, but when it comes to fun in the low end, the HD6XX likes to give the sceptre away and prefers to limit itself to a natural response and realism. For me it would be close to the ideal if it would give off 2-3 dB in the upper bass and add this to the sub bass. If you prefer a well-dosed, natural bass, which is a bit softer but not muddy, the HD6XX is the right choice.

Mids
For my taste, the mids are the heart of the HD6XX. However, I understand also such opinions, which describe them as somewhat veiled and conservative. Well, they certainly don't have a WOW-factor, but they are damn natural in their presentation. The point of criticism is the clarity, so I go with the first argument. But only to a limited extent, because I don't have the feeling that something is being withheld from me or that the mids are falling behind compared to the bass or trebles. On the contrary. The HDXX is a slightly mid-focused headphone, which however harmonizes very well with the bass and treble and is oriented towards a neutral frequency response. The mid/upper bass gives them a bit more warmth, to speak of absolute neutrality, but this makes the mids more musical and gives them a natural sounding timbre. Vocals should be mentioned here as a highlight, but the tonality of instruments is not to be blamed either.

Trebles
In the high frequencies the HD6XX is a bit more reserved than it should be. It sounds absolutely realistic and provides a lot of information, but in the top end it might be a few dB more without making the sound too bright or artificial in my opinion. This could also give the HD6XX more transparency. Here I would like a more direct response, but as in the bass and mids this is criticism on a high level, because basically the HD6XX does everything right when it comes to natural sound reproduction. Only a little bit the effervescence is missing, but life is not a rainbow-colored unicorn and therefore you can't really blame the HD6XX when it tries to stay authentic. Sibilants or peaks I can't make out, which makes for an absolutely safe and fatigue-free sound experience. Tonal correctness is clearly more important for the HD6XX than the big show.

Stage
Thanks to the open construction, the stage has a lot of space in the width, but it is somewhat limited in the vertical. This means that the sound information is displayed in a somewhat compressed form when compared with the AKG K/Q701, for example. However, this gives the HD6XX a pleasant intimacy and it has a robust foundation.

Imaging
When it comes to imaging, the HD6XX doesn't necessarily play over budget, but it plays within it. Due to the somewhat lacking clarity and sharp separation, the HD6XX doesn't have any localization problems, but the space between the individual pieces of information is not the biggest and can collide here and there. Nevertheless, a very coherent 3D image is created, which I find realistic, even though I would like to have a little more space to the top.

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Outro
The HD6XX is often considered the best value for money at the moment when it comes to a laidback, neutral sound with a warm touch. This is true, but this characteristic is also a reason why the headphone won't knock people out in rows, because the HD6XX doesn't offer an exciting sound experience. Instead, a very natural one, with slight deficits in stage and imaging, which means grumbling on a high level. The relaxed and somewhat "veiled" sound presentation (typical for SENNHEISER) is certainly not to everyone's taste, but for me the HD6XX sounds just right and sufficiently musical, which it has ahead of many AKG models. In addition, there are no limitations in the audibility, which is a bit at the expense of the expansion at both ends.
Also by its appealing detail rendition, the wearing comfort and the authentic sound, especially in the voice reproduction, it is indeed a value that is hard to top, since the HD6XX is above all a weapon in tonal terms.
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audiohamster

New Head-Fier
Pros: Natural but revealing sound.
Cons: A bit mid-bass heavy.
Price/Performance: 5 star headphone.

IMPORTANT: BURN IN THE HEADPHONE FOR 24 HOURS.

These have a pretty solid soundstage, much bigger than your typical closed headphone. They definitely excel with any kind of acoustic music. I have also found that they're great headphones for tuning a system because it's very easy to hear changes in the system and make sense of them. Very balanced sound.

They aren't the type that make every type of music sound good. They make most types sound good, but I actually dislike them with most techno music. For one, they don't have the greatest bass of all time, and they're a bit mid bass heavy for most techno tracks.

Some headphones in the price range produce better bass, such as Meze 99 Noir's. But, the HD6XX are in general much more revealing and accurate across the rest of the frequency range than other headphones in this price range.

Once you realize that these headphones are way beyond most USB dac/amp combos you'll appreciate how good they can be. Don't be to quick to judge these headphones as they're very transparent and reveal every little miscue in your setup.
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