Sony MDR-MA900 Over the Head Style Headphones


Headphoneus Supremus
Pros: Light, engaging, good clear midrange,non-instrusive highs
Cons: Padding could be softer, low frequency lacking, nothing special in aesthetics
Source and amp: Using the Objective O2 amp and ODAC combo
Build quality and comfort:
Headband pad is a little too firm, may need break in. Initially putting them on, the headband is feeling is evidently there but with time it slowly disappears. Earpads are not the softest nor particularly t thick but the low clamping force and lightness of the headphones make it acceptable.
Build quality is ok but reasonable in keeping the headphone light weight. Only the cup holder part of the headphone is magnesium, the rest is plastic.
Good driver depth for people with dumbo-like ears as they are angled steeper than the HD558 and AD900X.
When I put these , I was quickly reminded of my HD558 upgraded in almost every aspect. The sound signature is similar; forward and engaging but not in your face like grados. As someone who mostly uses Grados, I did not get the impression that these are dark sounding at all; HD558 is darker sounding. The highs may not be the most extended but it is not offensive making it well rounded for just about anything thrown at it. The sound is more crisp sounding than the HD558; clarity across the board is an improvement on the MA900. There is a good amount of detail but do not expect micro detail level extraction. The midrange sounds lively and works quite well with voices without sounding nasally for both female and male voices; I thought it worked well with both. The midrange sounds layered and is transparent; it is not thick sounding. The midrange is evidently clearer than the HD558,  especially vocals on the MA900 I much prefer over the HD558. The whole sound in general sounds more open and spaced apart. Sometimes vocals on the HD558 sound like they come from 1 point in the middle where as it doesn't on the MA900. The highs and mids work well together and sound balanced to me without one being too overly powering. In the bass region though, the HD558 hits harder and the low frequencies are louder. Low bass rumble is hard to hear on the Sony; maybe it is due to the housing enclosures as the HD558 is more encapsulating than the MA900 in physical design. I find the bass even lighter than the AD900X on the low end. I can totally picture a new buyer asking where the bass is; the only clear weakness. For me, it is fine but I can see someone wanting more. Both have a good midbass impact to make them enjoyable with pop music. The sound stage is not significantly wider than the HD558 but expect some improvement in depth and width just don't expect a world's difference. There is definitely a better sense of air. The separation is better on the MA900 vs the HD558; it is simply easier to differentiate fore ground and background. Also maybe for some office users, it's important to note that the MA900 leaks out sound more than the HD558 so you may annoy some coworkers nearby almost as much as Grados.
Would I buy these again? Yes I would. I may be looking to sell my HD558 now. I like the whole sound and wasn't sure what to expect in terms of sound. They met my expectations for the price and in some aspects exceeded. I thought the sound stage would be wider but I can't imagine anything wider than the AD900X. Not 100% sold on the general consensus that these are the most comfortable headphones ever but we'll see what happens through pad break-in although they are certainly light but weight alone does not determine comfort. If you like the HD558 but didn't like the midrange much, you may want to give these a try. Other than the bass, it's a clear step above the HD558 in every aspect in terms of sound. Crispy is the one word I would use to describe these.
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Thank-you for this review. These headphones don't get talked about here that much, though I feel they may be kind of a sleeper. More and more I read about them. Crazy in some ways that they don't get the attention that you would think they would get ? I have them in the running as my next over ear purchase so I will also write a review. There is something different about them as the driver size is huge, the open areas on the sides are an new style. The headband and construction seem very different and many like yourself are just getting used to the set-up. I have always liked the Sony house sound though it may have changed a little in the last 15 years? For some reason my instincts are saying buy these and I see this review come up. Maybe it's all suppose to work out and we get to enjoy great sounding value priced headphones? Cheers!
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I'm very unfamiliar with Sony's house sound as this is my first purchase that isn't just a $15 can I had for over a decade ago from them. I would like to hear a flagship sony based on what I am hearing on the MA900 with better bass. If bass isn't your number 1 importance I think you would happy with the sound. The talk about them being very light and talk about the soundstage is what interested me in giving them a try. No glaring flaws, just wish the lower bass was louder with stronger impact. Not the nicest looking for the price but sound before appearance for me. I was not expecting this clarity I am hearing.
Pros: Sound, wide staging, instrument seperation,
Cons: ? Gold fabric in box? Seriously...thin fabric cloth case. That's it

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New Head-Fier
Pros: Sounds good .....
Cons: Not so good after I listened again
I managed to try this MDR-Ma900 against others in the same shop. 
The comfort and ergonomics of this Sony are very good.
Initially, I was pleasantly surprised how nice it sounded. 
But after a longer listen I realized there seems to be grains and slight harshness especially the violins and mid upper registers.
I compared the same track and different music to be sure and the same graininess was there.
At this price and time of writing, I think there are better models out there with better highs than this. 


100+ Head-Fier
Pros: Very nice with instrumental music (violin, guitar), modern jazz, classical, psych/stoner rock. Epic soundstage in fps games (quake live, cs: go)
Cons: Not the strongest bass, but could be personal preference, can EQ it, and make it fuller
Wow, i am soundwhoring in fps games now, i feel more aware of suroundings, and enemies steps distance, you can easily say the difference between some slightly cheaper and very cheap headphones!!! Had senn's HD429 + 558 + 598 open backs, and akg 550 closed backs before, oh man, sony are better in soundstage among them all, not sure by what margin, i'm not audiophile, but since i've started checking more expensive headphones like sens 5xx series, akg, i can tell the difference.

They are very light and comfortable, the other most comfortable headhpones i ever had (using right now) motorizer headphones. I love thin cable, makes me want to take them out with my smartphone sometimes, cable is very handy. They look fragile in photos and once you open the box, and when you take them in hand, you easily feel - they are sturdy, firm, flexible headband of metal, cloth material and rubber tubes inside shouts - quality. Seriously, when you put them on your head and turn the player on, you don't even care if they look fragile. Thin, firm, metal headband is another reason to fall in love with them.

I'm not good talking about lows mids and highs at all. All i can say these cans are lovely with music for me, just because they don't have overpowering bass, it's there, it's tight, not tiring, i love it. Instrumental music, modern jazz, classical, psychedelic/stoner rock (hidden orchestra, kingston wall, animals as leaders), they'll do fine with these genres. Female voice sounds great with these. Wish they were somewhat better with crushing heavy more agressive metal other than instrumental progressive metal. I am not very good at reviewing headphones.
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Hm interesting, i thought bassheads don't even look at ma900, i'm pairing these with FiiO E12 16dB revision2, 880mW @ 32Ohms, sounds really good over my smartphone, i wanted to relisten all songs i have in my smartphone folders, i'm impressed. I've tried to compare these with Philips SHP9500, and whenever i play games with them and i need to hear enemy early, i drop shp and put ma900 on quickly
7 years and going, still haven't replaced them as main, daily driver on pc, still first pick for FPS games ever since for very wide soundstage
I got AKG 702 this year, and interesting, sony ma900 sounds slightly bassier than akg k702 for me now, and i am starting leaning towards akg 702 neutrality more and more in music, even in games


Headphoneus Supremus
Pros: Comfort, Build quality, Pleasing warmish neutral sound signature, Easy to drive, Not source or amp finicky(also a con)
Cons: Grainy and veiled sound, Limited scalibility, Lacks refinement, Not the most coherent
Sony MDR-MA900 Review
In the past I compared the Sony MDR-MA900 to the then similarly price AKG K612 Pro. I'm doing this review because I have the MA900 in my possession for a certain amount of time and I came to a better understanding exactly why I felt the way I do about the MA900 compared to the K612. I currently use the K712 as my main headphone but it is quite different sounding than the MA900 and I feel the MA900 is better compared to my HD 545 and K612 than the K712. The systems I am reviewing the headphones on is the HRT Music Streamer II+ as the DAC and both the Hifiman EF2A(with stock tubes, RTC tubes, Siemens tubes, GE tubes, and RCA tubes) and the FiiO E12 as well as many other sources such as my laptop, iPod Touch 5th Gen, etc. This is going to be a relatively short review as I'm going to get to what I like about the headphone and what I think it does well and what I don't like about and what I feel it falls short at.
I'm going to state this now while the amps have minor impact on the sound, it's not really going to make or break the sound like it does on my other headphones. The sound does get cleaned up some with better systems but nothing that drastic as say what happened to my now dead Sennheiser HD 555 which honestly outclasses the MA900 when amped well, the HD 555 has since been replaced by the superior yet older HD 545. As long as the DAC is good enough quality it sounds relatively similar on anything. This likely has to do with the impedance resistor and in fact most of my issues with this headphones sound may be related to it. The problem with the lack of scalability is that the higher you scale up the gear the worse this headphones sounds comparably to other headphones.
Comfort: This is the standout benefit of this headphone, it's just a featherweight with very mild clamp but is also secure on the head. There is an amazing sense of breathability and they can be worn for hours easily. Some minor quibbles with the comfort is the pads take some getting used to, the headband is sort of small so it may bother some at first, and it needs to be adjusted so the ears don't really touch the drivers.
Tonal Balance: I think one of the best things about this headphone is it's tonal balance, it has a very nice tonal balance, neutral and laid-back with a slightly warm touch to it, which makes it an pleasing and musical headphone that does well with most genres of music and it's a bit on the forgiving side so this makes it good for a variety of recordings.
Build Quality: Contrary to initial reports and suggestions I find the build quality of this headphone to be really good from the actual housing design to the cable itself. The lightweight build suggest heavy cheap plastic use, but this headphone felt well-built from when I first had it in my hands, it also has a good amount of magnesium alloy in the outer grills and yolks, the headband pad area also seems to be reinforced with metal. The cable was a concern for actual worry at first and it does seem to lack some strain relief on the plug but the cable is far sturdier than it appears and it retains no memory, the pair is about a year old and has had the cable run over numerous time with a computer chair and the cable shows no marks of scuffing, the headphone has also been dropped a few times with no marks or anything. These things seem to be built to last.
Soundstage Presentation: This headphone has an amazing soundstage presentation, it has one of the most speaker-like soundstages I've ever heard from a headphone and that's something truly special about this headphone. If someone is looking for a speaker-like sound, it doesn't become much more speaker-like than the MA900.
Easy to Drive: This headphone takes very little work to make it sound how it should or it's best because it sounds relatively similar on just about anything with the biggest improvements seeming to come from the DAC. This is a wonderful headphone for those who don't want to fiddle with amplification.
Transparency & Clarity: This is what I found to be the headphone biggest and most notable flaw and it's what led me to let it go. All other flaws are relatively minor compared to this one, so I'm going to just focus on this con of the headphone in the review. I'm just going to state it simply this headphone is veiled and grainy. There is a veil and grain throughout the entire sound. This wasn't a big deal when I first got the headphone, but after a while and especially after getting other headphones and upgrading my system more this problem became a bigger and bigger deal. The constant grain that seems ever present in the range, mostly midrange prevents this headphone from having a black background and seems to mask some of the more subtle musical cues and details in a recording. Once I started appreciating and grasping refinement and things such as transparency, a black background, musical depth, etc. better; I started to like this headphone less and less to the point where I have trouble listening to it. I believe it's simply a case where my standards and preference of sound causes me to stop being able to appreciate this headphone much anymore.
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nice review kman, I'm having lots of same impressions after getting 612pro (thanks to you) , to me it's more veil than grainy.. but I still believe it's a great headphone for instrumental and orchestra. good thing about ma900 is, it's really forgiving on bad recordings. perfect for watching youtube and low quality recordings. to me ma900 is a perfect gaming headphone because of the lovely soundstage.
Thank you. It is more veiled than grainy but it is a bit grainy as well. I do want to hear a pair with the resistor mod and see if the resistor is the cause of the veil. The review is positive overall and I do still recommend the headphone, it's just a hard headphone for me to personally listen to anymore due to the veil. If I could somehow lift that veil I would truly love the headphone.


New Head-Fier
Pros: Wide Sounstage, well defined instruments and vocals, neutral sounding, Very Comfortable
Cons: not too good in terms of analytical capability, not so exciting to listen to
I actually just bought this headphone and expect it to perform well.
However, when I compare it to my Beyerdynamic T90, or even my DT990 pro, this headphone actually lacks a bit of the analytical capability.
You feel like the driver can't keep up with sound when you listen to something that has sound going back and forth the left and right earcups.
Another point is that, when it comes to a lot of instruments playing together, they tend to blend together into a mess. These are probably my complaints with the headphone.
Even so, I do have a lot of like to this headphone. The comfort is phenomenal. It is easily the most comfortable headphone I have ever worn. It's feather-light.
Build on this is actually pretty good. Its magnesium, so it doesnt break so easily.
I also found this can extremely good for movies and everyday use. Because of the wide soundstage, it makes you blend into the movie environment pretty easily. Easy to identify sound locations also makes it good for gaming.
Overall, I feel like recommending this headphone to someone who is looking for an everyday use headphone and hasn't tried something higher end. They won't get disappointed.
If you only want sound quality, in this price range, get the DT990 pro (given that it is cheaper and sound better.)
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DT990 pro sounded plain weird to me, I'd say these two headphones are way too different to say one is simply better


100+ Head-Fier
Pros: A polite but engaging presentation, easy to drive, comfort, soundstage, great price!
Cons: Build & looks
The MA900 is “less headphone & more music”. The build is sparse, minimalist and does raise some doubts about durability. The magnesium alloy frame is the backbone holding the plastic enclosed lollipop drivers. The cable is nothing special and I never had issues with tangling. This headphone may not rank high on the build category but remember that it well makes up for it in comfort.The clamping force is delicate, but the headphone sits comfortably on the head – the 70mm drivers cover the ear with ample space to breath! You can wear this headphone for hours and not feel the stress of something sitting on the head. I will confidently say that the comfort offered by the MA900 is unmatched by any headphone in this price range or even several times higher. Kudos to Sony!
the MA900 has a sweet and lovable presentation. It is polite and smooth, yet has enough bite for an engaging but relaxing listen. Treble is well presented and is without any sibilance. The clarity in the treble is apparent since the rest of frequencies are well balanced.Though the overall presentation of the MA900 slants to the warmer side, the treble presence is balanced to provide a good sense of detail and transparency. Some may feel the treble to be a bit too bright (compared to, say the HD650), but in my opinion it is just right! If my memory serves right it’s just like the HD600 tonally and is refreshing to listen to coming from the HD650.
Mids are transparent, detailed and bring out the palpability without any bleed from the bass regions.Surprisingly good bass for a open headphone! The bass is with texture and speed in the upper and midbass regions. There is of course some amount of “boominess” in the bass but that is still forgivable for an open headphone. The whole “Bass lens” acronym had me worried but all’s good. This is by no measure a “bass-head can” but should satisfy most listeners looking for a good bass performance. The attack and punch of the lower frequencies are however slightly distant in the vast soundstage.
The sprawling “soundscapes” that the MA900 fleshes out is fabulous! This is also where the angled drivers do their magic, and magic it is! Better soundstage presentation in terms of size and accuracy are impossible to find in this price class and can only be experienced in models like the Hifiman HE500 & Sennheiser HD800.The other headphone with such a lavish soundstage that I have listened to is the AKG 240DF, then again it definitely not as musical nor easy to drive! As a design advantage, open headphones generally have a more wide and nautral soundstage. The MA900 in particular with its large 70mm driver, angled driver placement takes the open design to new highs.
Perhaps the biggest asset of the MA900 is its undemanding nature when it comes to other gear in its signal route. I listened to the MA900 through a Burson HA160 Headphone amp/DAC Magic, Macbook pro headphone output, Dell XPS M1530 headphone out, iPod Classic headphone out, iPod LOD to Fiio E11 & O2 headphone amp. Remarkably the overall presentation and much of the detail and clarity remains across the different gear.
There is no question in my mind that the MA900 is an excellent buy at the price and performance levels (as good as the HD600!). It goes well with most music genres and could become the “go-to headphone” for music lovers not wanting the hassle of having additional gear or heavy headphones.
Jump on over to my blog for the complete review!
Lovely write-up man, really well put and I agree with every word, almost. :wink:
Thanks man.


Headphoneus Supremus
Pros: Comfort and weight. Airy sound.
Cons: lack of coherence, no sub bass, harsh upper mids.
Ok, this is a headphone that I've been meaning to try out for a while. So after spending most of the day with them I'm going to give a few quick impressions. (I don't believe in burn-in mechanically with dynamic drivers)
I've listened to all my usual recordings for testing equipment, from ECM Jazz, recent top notch classical recordings, Ambient from the likes of Tim Hecker, BT, Jon Hopkins. and some favorite rock Zepplin, Black Crowes. REM.
This is just my opinion... 
First impression was very good, smaller soundstage than what I was expecting but nice and airy. They are soo light! You can forget that you are wearing them. 
Going through some quality classical recordings mainly symphonic and the sound is very light and weightless. Floating there. Not much bottom end though. I put some Beethoven quartets on and the bass is much better suited here. The cello sounds very detailed and punchy. Played some Jaavi Sibelius and I noticed some added texture to the strings. Nice, but not sure if its pronounced a bit too much. 
With jazz I'm enjoying all the air and placement of instruments, but I'm immediately struck by a slight lack of oomph at the bottom end. By that I mean the kick of the drums with the double bass. Its very distant. There is bass plenty in quantity, only its kind of stuck at the lower mids and refuses to budge! I'm also now detecting some sizzle in the upper mids. Snare drum is pronounced or emphasized a little. I'm admittedly a bit of a tonehead so I appreciate realism more than any other attribute from headphones. So as the hours go by I'm getting more annoyed by the this. In fact this is the first headphone that has actually caused me some fatigue in a long while... (and I own HD800 and K701) Its the forward upper mids that are ringing. 
Ambient music works very well with these. Because of the forward mids all of the fine details and layering come across very well. The air of these is great for creating a big floating wall of noise. Really great with this genre of music. Electronica with deep bass is great from the top to mids but they fall short at giving you any bass satisfaction. E/Qing them doesn't help at all. They just can't give you sub bass.  
Rock music, I'm again a little disappointed. Electric guitar sounds great (Grado great) 'Whats the Frequency Kenneth' guitar sounds gritty and raw. Perfect tone. But as soon as the other instruments take part all focus gets lost for me. There is instant burring. This recording is commendable for its simplicity. A headphone such as the HD600 will clearly define the four instruments in use and create the space, even though they don't have that big a soundstage. What we have here is an airy sound, but the instruments are squashed too much together. Very forward and a little intrusive for my liking. I'm constantly thinking Grado. Maybe a Grado with a rolled off very top end and big airy pads. 
I used a Necosoundlab dual mono SS amp for my impressions with Arcam and Cambridge audio dacs, tried them on my other amps but there was clearly a massive impedance mismatch. I would not use these with anything of high impedance.
Remember these are just my honest opinions, and I can see why peeps like them, especially if you appreciate forward mids. But I wouldn't put them up against a DT880, HD600/650, K701. All these headphone are a clear league above these. You could ask what do you expect for the price of these?? Well for the same price you could buy a lot of good used headphones that will be better or a brand new K701. 
There are better headphones than the MA900 for the price, the MA900 does have it's flaws and I found he mentioned some in his review. I'm well aware the HD 800, HD 700, HD 650, and HD 600 are overpriced as are most higher-end headphones. If you are comparing headphones based on the original MSRP, it's better to compare the MA900 to something like the HD 598 or K612. I personally find burn-in real, sometimes it's very minor, but sometimes it's fairly obvious. And buying a higher-end headphone used doesn't mean it's not a better deal than a lesser new headphone so I don't really find it silly, you still paid the same amount in the end.
I found the DT880s to sound inferior to the MA900 in some aspects, and in most other aspects equal. Whereas the DT880 has better low-end extension it has far less oomph than the MA900 in the subbass regions, though that oomph isn't actually sound a tactile experience is just as well for movies and games -- and some orchestral music. (not for bassy music, though) I am considering buying a used HD600 though, they look great.
Thanks for the review. I like the cut of your jib. I will put off buying these until I find something I like better at the price point including used market. 
Do they really sound Grado-ish? I enjoy Grado-ish if you're talking the more neutral sounding models. However, my most important requirement for a headphone at this moment is comfort, but Grado-ish sound fatigue is not comfortable. 
Thanks for the heads up.


Headphoneus Supremus
Pros: Huge soundstage, laid back sound, awesome imaging, detailed without being fatiguing, comfortable, excellent with gaming.
Cons: Thin cable, flimsy build quality, sub bass rolls off, not very good with EDM (or very bass-heavy genres).


Headphoneus Supremus
Pros: Soundstage, comfort, midrange, bass
Cons: Little dark (for my tastes)
Ill make this short and to the point.
The MDR MA900 is a fantastic headphone and even fantasticererer at the price of $200.  The soundstage is just unbelievable, trumping cans that cost more than twice it's price (HD650, HD600, DT880).  The imaging is also great, and the best thing about the soundstage is how focused it is.  Neither the vocals, nor the bass are lost in this soundstage (amazing!). 
Let's take a break from the sound.
These are hands down the most comfortable headphones I have ever worn, so if your thinking about the comfort, just stop it because it's just silly.  I read someones impressions somewhere and he described the comfort as it being like a hat: after a few minutes, you forget they're even there.
The build is... well the materials themselves are good, while also keeping the actual weight of the headphones very low, but the structural design has its flaws.  Dropping these is ok, but sitting on them, won't break them, but it may just mess with the swivel mechanism or something of that sort.  The headphones actually look nice, but are not very inspiring when you have them in your hands.  
Sound: The mids are very clear and the instruments sound true to the source.  The bass is surprisingly good.  EQ makes the bass actually better than a lot of other closed cans  at the same price.  On it's own, and this is just me, it lacks impact for pop, hip hop, and r&b, but its great for rock, jazz, etc.  The highs are slightly recessed (EQ to the rescue).
Overall, they trash every closed can I've heard (and that's without an amp).
This review was done without an amp.
9.9/10 because of the look.
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100+ Head-Fier
Pros: lightweight, iPhone case-friendly jack, easy to drive, neutral, mid bass, soft treble; airy, musical mids; good soundstage, good with synths
Cons: skinny, non-detachable cable; slightly floppy (has lots of magnesium though), sub bass, initial ear pad comfort, sometimes shouty upper mid range
I purchased the MA900s to go along with my AKG K702 65 Anniversaries, as I wanted a headphone which didn't require amping and would be a little more musical with synths (AKGs tend to be too honest and 2D and untextured sounding with electronic and synthesized bass, and prefer instruments more). And so far, my impressions are that these are a great open-back, all-rounders for beginning audiophiles who want a headphone that goes well with almost every genre (save for bottom heavy stuff like dubstep and more mainstream rap) but do not have the amps and other equipment necessary for other open backs such as Beyers, Senns and AKGs to perform at optimum levels.
Much of my electronic music is disco, diva and deep house; and liquid funk (downtempo drum and bass), which I prefer to sound more airy, quick and upper to mid bass-oriented with emphasized vocals. The MA900s handle both of those genres admirably well and remain quick. They have a slightly rolled off, although still airy treble, which is what I prefer for downtempo music. The MA900s also handle downtempo trip hop and neo soul well with their smooth vocals and dark sound. The MA900s are overall a mid bass and mids-heavy headphone with roll-off on both the high and low end. Sonically, they remind me of a cross between a slightly rolled off AKG Quincy Jones Q701 (with its musical, neutral but lean misds) and the laid back sound Sennheiser HD500-series but without the thick lower mid bass and echoey, somewhat reverberated vocals. Although on paper it would be similar sounding to the AKG K702 Annies and K712 with its slightly elevated mid bass and rolled off highs, the MA900 is less analytical and has a more airy sound from my listening experience with less thickness.
Ear cup comfort is a little so-so FOR ME, and this is due to the fact that I have overly sensitive ears. If I shift the earcups all the way forward, my ears do not touch the driver cover padding, however the edge of the pads dig into the cartilage behind my ears, causing them to become sore. I find that shifting the headphones slightly back to where the driver pads lightly touch my ears is the most optimum position for comfort. I usually hate having things touching my ears and creating hot spots, but it over time it ceases to become an issue, and my ears quickly settle in. Will most people experience initial comfort iffiness like I will? No, but for those who have sensitive ears, you might want to keep this in mind. The MA900s do not have the roominess of Sennheiser ear cups, but they don't have those echoey vocals and head clamp, either. 
The MA900s are fairly light and lack that bulky feel that AKGs and Beyerdynamics have. Which means they don't feel overly cumbersome and are ideal for longterm music listening sessions, but this does mean their build quality is unfortunately rather on the floppy side. They don't have that chunky, substantial feel like Sennheiser HD518s or HD598s have. However, the MA900s have a large amount of magnesium in their build, comprising the driver back grill, the yolk and the yolk arms attached to the ear cups. The MA900 does look and feel premium, it just does not feel rugged or chunky.
Another small complaint I have is the cable, which is hard wired, skinny, long, terminates to a standard 3.5 mm jack which oddly has a plastic barrel surround. On a positive note, the jack is fairly slim and will easily fit in an iPhone case. And that ties into my final point. The MA900 has a nominal impedance of 12 ohms, and although they benefit from amping, you don't need one to get them to sound good (unlike AKGs). You could run them off a potato if you wanted to. The phone case-friendly 3.5 mm jack and included snap-on stereo plug that seems like an afterthought hint to me that the MA900s are not mainly targeted towards the audiophile who has tons of high end gear and likes to swap for higher end cables, but to the average consumer who wants a no-fuss, elegant, relaxed, dynamic-sounding headphone.
If you have a good amp and want a drier, more analytical sound, I would suggest instead checking out the new AKG K612 or Q701 instead. But if you are a beginner with open backs and do not have an amp to work with, I cannot recommend the MA900s highly enough. Just make sure to treat them well and not be rough with them. They retail for 300 US dollars, but you can get them for less than 200 on Amazon. A great headphone for around 200 dollars.  
Update: The ear pads, which were initially too pokey and hard have since broken in over time, and have become much more comfortable. I expect this comfort to get even better over time. 


100+ Head-Fier
Pros: Soundstage, natural slightly warm mids
Cons: Bass is there but not particularly engaging
Without a doubt, the MA900s have the widest soundstage that I have ever personally experienced. To provide some context, I don't think my personal soundstage processing is particularly sensitive at all (actually I would characterize it as bad). In many instances, I can't discern the difference between headphones that many others notice significant differences between.
When I 1st put the MA900s on however, it was an eye opening experience for me - the soundstage was wiiiiiiide - immediately and easily discernable.
Comfort is very good - better than anything I have owned with the exception of Koss PortaPros (very light, low-pressure on-ears).
Highs are bit rolled off, but not lacking too much detail (for me - I experience fatigue easily with aggressive highs - not an HD800 kind of guy). Mids are a strength, leaning slightly towards warm. Bass is there. but not particularly engaging, depending on the style of music you are listening to. These are not LCD-2s 8)
Almost perfect on something like Phildel (highly recommended), lacking somewhat on bass-heavy EDM (Subfocus).
I find myself using these a lot simply because of their comfort - if you are looking for a headphone to listen to for hours at a time, these fit the bill (I have a small male head but fairly large ears - 70mm.
The HD 598 is still awaiting the slaughter you promised


Member of the Trade: Lachlanlikesathing
Pros: Supremely comfortable, light weight, natural laid back sound, wide soundstage
Cons: Lacks a little sparkle, bass slam could be tighter, flimsy feeling build
Along with the summary below, I have posted a comparison review of the MA900, Audio Technica AD900X and AD1000X here:
I've also got a youtube review of the MA900. If you like the video check out my channel for more reviews :)

The build of the MA900 is interesting. The headphone feels very light weight and almost flimsy in the hand. This isn't because it is badly built - on the contrary build quality is quite decent. It is the proportion of the parts, the super light weight and the way the frame is so flexible which makes it feel flimsy. As soon as you put them on your head you realise how much effort has been put towards minimising the MA900's weight though, which is almost enough to forgive them a little. That said if the MA900 was at least made out of metals it would have inspired more confidence, even if it were a little heavier.
The MA900 has a neutral sound, slightly on the warmer side but overall very balanced and generally inoffensive. The bass has good definition but doesn't dig terribly deep (as per most open headphones) and the mids have a somewhat dry tone, whilst lacking a little extension at the top. They sound great with female vocals. The MA900 actually sounds like a Sennheiser HD650 with less lower bass and more forward upper mids. Because of the steeply angled driver the MA900 has a open and relaxed soundstage, with good definition and instrument placement. However with the relaxed treble it does sound a tad more intimate than say, the AD900X or AD1000X. Overall they are very agreeable and the main negative that can be said about the sound is that it might be too conservative. It's perfect for hours and hours of listening with different genres, and the comfort helps a lot in that regard.
I love the MA900 as a workhorse headphone and it's what I wear most of the time at home on account of its comfort. The build quality is okay but won't inspire any collectors of Sony gear. I really think the MA900 has been overlooked on Head-Fi on account of initial bad reports about the build, and though it's not the most exciting of cans it certainly is a fantastic all rounder. At the current Amazon Japan pricing it's a steal.
The MA900 IS made out of metal, though. The driver grills, the arms and yolk are made out of magnesium.


100+ Head-Fier
Pros: Open, clear sound. Detailed and refined. Nice tight bass with plenty of texture. Superb soundstaging and imaging. Very comfortable and light.
Cons: Flimsy build-quality. Extremely long and cheap cable.
First off, let's just get the negatives out of the way.  The MDRMA900s feel and look like $20 headphones.  I have no idea what Sony was thinking when they designed these.  They feel and look cheap.  The cable is also extremely long and thin.  It does not exude quality.  However, I suppose there is a bright side to the cheap materials used here - the MA900s are feather-light.  When I say light, I mean they are the lightest full-size headphones I have ever used.  They truly disappear on your head when wearing them.  They are one of the most comfortable headphones I have used and when wearing them I quickly forget how cheap they feel in my hands.
Now that the negatives are out of the way, let me get to the overwhelming positives - the sound quality.  As soon as I put these on, I knew they were something special.  The MA900s are very open and clear sounding.  To my ears, they have fantastic detail retrieval while not sounding the least bit harsh.  Vocals are very detailed while still retaining a full quality.  The bass is tight.  It's not boomy nor is it lacking.  Seeing as how these are open headphones, and I do mean open, the bass is actually a nice surprise.  I was expecting less bass but came away completely satisfied with the quantity and quality.  These truly are very well-rounded headphones.  
As for the soundstage.  It is expansive.  Sounds come from all around and instrument separation is some of the best I have ever heard.  Imaging also seems to be very precise.  All of this may be due to the large 70mm drivers.  I don't know.  Whatever the reason, the MA900s are technically very impressive.
All in all, the MA900s were a big surprise for me.  I bought them out of sheer curiosity and fully expected to return them when I took them out of the box.  That changed the moment I put them on my head.  
It reminded me that while it's nice to have a pair of headphones that look good, it's far more important for them to sound good and the MA900s sound very good indeed.
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"feel and look like $20 headphones"
whene i had the MA900 i thought they have fantatic build quality.
and they look really cool:
   but Other than that I agree with every word you wrote the article :p
grate review!


1000+ Head-Fier
Pros: Can go loud with harsh recording with little or no penalty, Grain-free; Very convinciong sense of space for out-of-head imaging
Cons: Some forwardness on lower mids lowers transperancy; Too polite treble
[size=medium]The MDR-MA900's the current the top model in the latest open-back line-up from Sony. While  the latest  generaraion is definitely not the greatest with a distinctly less "hi-tec" vibe then the previous SAx000 models (as perhaps can inferred from the one-digit-less suffix and the of course a much lower MSRP pricing) the MA900s, in particular as a TOTL model,  comes with an altogether different concept- that of the "Full-Open-Air" design, Originally pioneered in the '90's with the MDR-F1 (by one of the principle desingers responsible for the legendary MDR-R10 by what i read in a certain blog, RESPECT).  [/size]
[size=medium]How this design is differentiated from a standard Open-Back is the minimization of the chassis frame to just the base area needed to support the  driver assembly and  for the  mounting of the earpads.  The rest is left for the open-air  to fill in- Think open-baffle speakers on the head… This serves for both sound-quality and comfort pourposes: Main objective is to minimize resonances both from interaction of intial sound waves coming from the driver and reflected waves form the head with the frame, thus achieving a less "boxy" sound-field.  Second is to reduce total weight of the frame, thus achieving a better long-wearing experience. Major disadvantage with this approach is the weakend bass power because bass is omni-directional and with open-back headphones some reflection off the frame is beneficial for an adequate response (with potential added support from the earpads material). With the MDR-F1 Sony implemented a simple low-pass passive acoustic filter foam-like funnel  to enhance the bass impact (you can read about it here) and while it contributed to a rather acceptable mid-bass response the lower bass was still mostly MIA. For this reason probabley, the MA900 has gained a 40% increase in diaphragm size to a (presently) whopping category-leading 70mm (2 4/5"), With next largest AFAIK HD800's 56mm. This of course does not imply that size alone matters for quality and while MA900's bass is  indeed a major improvement from the F1 it still is lacking in authority in the lowest octaves (20-60hz) compared to some other open-backs. It is mid-bassy rather than plain-bassy, but in the context of it's design goal as described above it's is very good and I'd never describe it as an anemic response. To relate some sense of reference I'd place it as noticeably above the border-line anemic ATH-AD900 and slightly ahead of MDR-SA5000 in the upper bass presense. [/size]
[size=medium]What defines the character of MA900's sound is of course how open it sounds- A very strong sense of sound that is originating outside of the head and in front of it, almost as if projected from a miniature soundbar on the forehead rather than coming from stereo elements hanging just next to the ear.  It's not as vast or extremely spacious (HD800, K701) but in terms of a sheer-openness scale  it's got to be  one of the best I've heard from a conventional headphone with earpads , barring electrostats.  Whether there's an added  psycho-acoustic side-effect from how light and non-intrusive it sits on the head I can't tell for sure but it the it's definitely something more convincing even compared to some very strong open-backs as the AD900. I feel that the mild treble response holds aback this "disappearing trick" some, a more neutral (=brighter) treble response would've done nicely to futher illuminate the notes' overtones and improve the imaging accuracy which is only slightly better than average, About on par with the F1 and AD900, but clearly inferior to a laser-etch grade projection of the likes of SA5000, ATH-AD2000. On the upside it depicts a very cohesive soundscape with absolutely stellar center-focus. [/size]
[size=medium]MA900's tonal quality is a mixed bag for me.  The moderately  forward  lower mids, along with the added bloom reminiscent of the mid-bass hump and the very polite treble response do hinder somewhat the sense clarity and refinement   of an otherwise a remarkably clean and grain-free sound. I do wish Sony would have continued the reference-type sound sig from the SA5000 in the frame of of Full-Open-Air  but I realize that it was not the intention from the very concept's beginning in terms of Ergonomics and technical restraints such a frame puts on overall fidelity. Perhaps if this concept would hopefully be continued in the future that a more advanced diaphragm material could be utilized instead of the "old-tech" Mylar PET, such as the LCP (Liquid Crystal Polimer) from recent models such as MDR-1R, MDR-Z1000 and EX1000.  [/size]
[size=medium]Regarding the build quality: Many describe these as flimsy and cheap feeling. I partially agree. The frame indded doesn't retain a rigid composure such as similar models in the price range may, Certainly MDR-F1 and ATH-AD900 IME.  A notable "flaw" shows if the cans are held single-handedly from one cup the other will "flop" sideways. However, this design has to be taken in the context of Sony designers trying achieve the lightest frame and a minimalistic form-factor at the same time. So having definitely tackled both these goals with great success I personally thin the flimsiness serves it's purpose and it's totally forgotten as soon as they gently conform on the head .  Another common rant, as plasticky as they seem, the most vulnerable/thin areas which are the arms and forks between headband and cups are made of magnesium, not plastic. My only gripe would be the stiching of the headband could be better and I saw a couple of loose ends just a few weeks since I opened the box. [/size]
[size=medium]To conclude my impressions, I think the main selling point of these headphones lies not in sheer  technical capabilities but in combining an incredibly light and comfortable full-sized from factor with a nicely articulate yet smooth signature , and especially with a great staging ability to make the music float (almost) as convincingly as  if it was originating much further away than few cm from the ears that the enormous  70mm transducers are reproducing it. These traits do add-up for a superb all-purpose headphones at a very competent price. [/size]
I have owned these for a few weeks and quite like the sound, especially for more complex classical music. These headphones are incredibly light weight and comfortable.
I will disagree with comments on the design. I don't see how the industrial design, materials or construction can be called "flimsy" or "cheap feeling." They flop in your hands but so what? For listening purposes, the design is solid and well thought out.
The resistors are a different story of course. . .
It sounds booming and unexpected.
Same for everyone i think..................
These actually sound quite good for the $125 I paid for a like new pair on Amazon. Quite a deal for me. They sound real nice and I love the comfort, mine are run through an amp.


Pros: Detailed and musical, airy mid and treble, terrific soundstage, comfortable.
Cons: Build quality perhaps, it's a Sony though..
At $200-300 they are a steal. They are competing against the much more expensive high-end variants and partly excel at it. Overall, you cannot go wrong with these headphones – 10/10.
Audio quality
I have analyzed these using my laptop, connected to Audioengine D1 DAC/amp, listening to everything from piano concertos and symphonies to hip-hop. The bass goes deep and can be strong when needed without influencing the middle. The middle range is very clear and detailed. The treble is airy, soft and gentle, maybe a bit muffled at times. Soundstage is very convincing thanks to the open design and the placement of the membranes. I find these on par with much more expensive (1k+) high-end headphones. They are wonderful for acoustic recordings and work well also for studio productions. Overall, I find these very musical and pleasing – 9/10.
At first sight, they may seem quite cheap and plastic and not a luxury item that is built to last for a long time. But still, it’s a Sony… The look might fool you. After a while, I have learnt to appreciate them for what they are, and they do have a certain elegance and unique design after all. The cable is ordinary and rather long, adjusted for comfortable listening in the armchair rather than in front of a laptop. Overall, the design and build are OK – 6/10.
This comfort factor is very important to me when choosing headphones. Compared to most high-end headphones on the market these sit very light and gently around the ears. The slight opening in the cups prohibits sweat and heat during long listening intervals and leaves room for the ear lobe as well if worn correctly. The cups sit firmly enough not to fall off when moving the head in various directions. The headband is fine but could be a bit wider, for a more even weight distribution. Overall, comfort impresses – 9/10.
Comparison to PFR-V1 and MPR-F1
This is a special section that involves how the MA900’s compare to Sony’s discontinued models V1 and F1, all targeting the same kind of users. The V1’s may sometimes have the edge when it comes to soundstage, but most often, also with acoustic and binaural recordings, it is a dead heat. The V1's lose because of the cumbersome fit and weaker bass. Besides, they are rather mediocre for all-round listening. Unfortunately, I have not tried the F1’s yet. The smaller membrane size should bring less bass, making them a bit on the light side sound wise. They are more open and should therefore be a bit more airy, both in terms of comfort and sound. The comfort may have an additional advantage with velour cushions and a wider headband. Both the V1’s and F1’s are becoming scarcer nowadays and may cost more than they deserve to satisfy the curiosity.
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Nice review!


100+ Head-Fier
Pros: Super comfortable, smooth treble
Cons: Veiled midrange, weak bass, limited availability
70mm drivers, fully open design, premium materials, and simply the best comfort of any headphone at any price. The MA900 has many things going for it. The sound signature is a little laid back, but ever polite. One would think that a 70mm driver could provide a hearty slam. This isn't the case -- sub-bass is almost nonexistent, and midbass is inferior to that of a Grado. Decay is slow on the MA900, so the midbass isn't super-crisp. Treble, on the other hand, is quite smooth on this headphone. It's not a bright headphone, so even the shrillest of instruments, such the piccolo, won't pierce your ears.
The big problem, however, is the midrange. It's clouded. At $350 (imported from USA to Canada in June 2012 -- Sony Store only carries up to MA500) I wanted a headphone that was crystal-clear. Unfortunately, I think the thick fabric covering the driver has ended up muffling the headphone a little. Soundstage width is a little congested unless the MA900 is worn in reverse. But in reverse, bass extension and impact are reduced even further.
I suspect the frequency response is tuned to more of a studio monitor headphone than a musical headphone. Unfortunately, it means the MA900 is miserable-sounding at a low listening volume, as the bass is too neutral to provide any spark to the music. Ultimately, while the MA900 is a good headphone if you blast your music, I like to normally listen at <75dB SPL. For that, my Grado vented SR225i (2 large holes, 8 small) bettered it in most aspects, as its frequency response better follows the equal-loudness curves. I ended up returning my MA900.
There's a good reason why the street price has dropped from $300 to $200, and that Sony Canada only carries the lesser models (MA100/300/500) in stock. It just isn't very good. The lesser models are even worse, however, so I don't know what Sony's thinking.
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Ah, I was going to say try removing the fabric =O
I thought about doing that, but the fabric seemed to be glued on, so I couldn't do it without voiding the return policy. In fact, this headphone is one of the least mod-friendly ones I've seen because of the need to reduce weight and provide maximum comfort above all else. That's why it only got 3 stars for design from me.
Sony when will you be competitive in the audiophile department? *sigh*

Gu Sensei

500+ Head-Fier
Pros: superb soundstage, excellent clarity, light, comfortable
Cons: flimsy feeling build quality
I have been using the MA900s since they came out. I like them a lot and think they are an excellent value. I use them at my office where I need cans with minimal isolation in order to hear door knocks. I have cycled through a lot of different headphones for this role and until the MA900s, had settled on the F1s. I really like the F1s but feel the MA900s are a notch superior in terms of sound quality. They just sound cleaner- better focus and clarity. More present bass. The soundstage is excellent but I slightly prefer the F1s for that.
I find the F1s to be more comfortable as well (they would get my vote for most comfortable cans ever). The pads and headband material feel softer than what is on the MA900s. The MA900s headband touches only on one small area whereas the F1s seem to more evenly distribute the pressure. The MA900s seem to slightly clamp a bit more. My ears have a little more clearance with the F1s also. They both are exceptionally light. The MA900s build quality seems a lot closer to something in the $50 range. They just seem flimsy and I really am not that impressed with the feel of the material for the padding. The F1s feel and look a lot nicer. I love the metal microphone driver coverings. The MA900s are a bit sleeker and perhaps offer less of a geek factor and probably function better for listening while lying down.
I think the F1s are a supremely cool pair of headphones and are under appreciated around these parts. I would much rather listen to them day in and day out than a lot of other higher/high end headphones that I have owned and tried for use in my office (HD800s, LCD2s, AD2000s, HE-500LEs, RS1s, PS1000s, GS1000s, HD650s, and quite a few others). All of those phones has aspects of their sound signatures that ultimately I found disagreeable or too distracting. While I absolutely love the soundstaging and comfort of the F1s, the MA900s are just a touch behind there and seem a bit more than that ahead in terms of sound quality. They are not the last word in refinement or detail but nothing bothers me about them and there is plenty I like.
Both the F1s and MA900s are sitting side by side and I have completely gravitated towards Sony's newer offering. The other open pair of headphones I use at home are the Stax 009s, and there is no comparison there. However, the MA900s deliver enough of that high end feel to my ears that if I ever step back and truly realize what a ridiculous sum I have spent on hi fi headphones and components, I could scale back to the MA900s and an iPod and live a very content audio life.
I really like the Z1000s too and hope that an MA1000 is in the works.
As usual, that is just me though, and no one should ever buy a pair of headphones based on what I think.

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