General Information

Sony MH755 thumbnail, cropped.png

The Sony MH755 is the bundled in-ear earphone for the Sony MW600, SBH20, SBH50, and SBH52 Bluetooth devices.


Specifications
Driver: Single 9.2 mm dynamic with neodymium magnet
Frequency Response: 20 Hz to 20 kHz
Sensitivity: 115 dB/V (100.5 dB/mW) @ 1 kHz
Maximum input power: 70 mW
Connector: 3-conductor L-type stereo 3.5 mm mini plug
Cable length: 77 cm (long side), 57 cm (short side)
Content: 1x Sony MH755 earphone, 3 pairs of silicone sleeves (S, M, L)


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Latest reviews

brianforever

100+ Head-Fier
How to Spot a Fake - Magical Misunderstood Sony MH750/755
Pros: Harmish (Harman Kardon) Sounding IEM with Extremely detailed Treble and Bass ranges for a very low price.
Cons: Too many "Experts" out there who assume they are Fakes due to the different variants through the ages (Circa 2012-2019) And a confusion via the Interweb that the MH750 and MH755 drivers are different but in fact is untrue and is one and the same.
Summary:

The MH750/755 variants having such a long history have also been investigated by other hardworking mates. I'm deeply appreciative of their advice and humbly give thanks to them too..and many others not named with apologies, those who I would greatly mention are @crinacle @Slater @TheVortex @axhng @eqsOne @Nuclear Reactor @ClieOS @mochill @aspire5550 and finally @Sead (Member of the Trade: Sony Mobile)

Just again to highlight.. Sony's OEM ( They designed, engineered, and make the prototypes but contract out to others for mass mfg) has 2 iterations of their drivers (pop it open yourself, only takes less than 2 mins with a thick pin ) from 2012-2013/4 (13WK-XX) -Off-centered oval vent & their newer 2015/6/7/8/9 (15WK XX onwards) with centered round vent and they do share almost identical sound signatures except the newer versions has a slightly elevated Mid/Sub Bass,

This was also agreed upon and mentioned by @TheVortex & @aspire5550 https://www.head-fi.org/threads/chinese-asian-brand-iem-info-thread.820747/post-14705306, as I believe Sony had to work with that, due to different factory contracts, product improvements and cost reductions thru the years, but are very strict on their preferred sound signatures to be as close to their prototype as possible.

How to Find/Buy a unit Today :
(They are getting very rare due to the lack of mass production )


Xperia Phones are Bundled with the MH750 , TYPE: AG-0500/AG-0501 (Black/White) , not MH755 (Shorter cable without microphone)

It's practically impossible now to get the older off-center air vent MH755/750 TYPE: AG-050X version made in 2012/13/14 anymore usually with MFG dates 13WKXX - 2013 Week XX. & 14WKXX - 2014 Week XX

MH750/MH755, TYPE: AG-0500/0501/0502/0506 , Mfg 2015-2019 (Center air vent) , can still be purchased from limited sellers, of course, may also be bought together with the Sony Bluetooth Receiver and recently also spotted the 2019 standalone MH750 Sony retail package
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There are also reports of the newer MH755 retail packed with Bluetooth with a Straight 3.5 mm jack instead of a L-Jack and discontinued usage of the CE tagging with Product details on the cable for MFG 2017-2019

Did an in-depth 3 different Types and spent 1-week doing A/B/C testing so you don't have to :

1. MH755 AG-503 - MFG 2013 13WK27 - 2013 Week 27
2. MH750 AG-501 - MFG 2017 17WK42 - 2017 Week 42
3. MH750 AG-500 - MFG 2015 15WK52 - 2015 Week 52

Sony has another new variant mfg in 2019/20, with the straight 3.5mm Jack but since I don't own it or able to buy it ..I'm sorry I will not be able to comment on the sound signatures.
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Below an image of the MH750 bundled with the Sony Xperia XZ2 Phone MFG 2017, notice it no longer has any CE markings or labels on the cable
XZ2-2.jpeg


The side vent that started all the confusion on the Internet with the MH755 VS MH750:
TYPE: AG-0503-MH755 (Mfg:2013) AG-0500/1-MH750 (Mfg:2014)


The 1 to 1, 100% Identical off-centered air vent MFG 2013-MH755 & MFG 2014-MH750 whereby the MH750 is super rare as you can't just buy them from any online stores as they are bundled only with Xperia Phones thus why @crinacle made an incorrect assessment in 2019 review and comparison of MH755 (MFG 2013, Side Vent) vs MH750 (MFG 2017, Centre Vent) as they are 2 different hardware variants from different manufacturing periods back then.
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750-1.jpg
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MH750_tag.jpg


The centered air vent, MH 750/755 has various TYPE: AG-050X versions.
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This is how a fake MH750/755 driver looks like, without the 2 small eyelets, also most likely not secured or glued to the shell, thus in some cases, users have complained of a loose driver when the shells are shaken.
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Lord of The Vents ;

In relation to 2013/14 side vent and the later & current common center air vent drivers
In my earliest memory, the MH750 model appeared first before the MH755, via the Ericsson-Sony partnership in 2011/12.
sony_ericsson_mh750.jpg


And it shouldn't be a surprise as all Sony Corp Comparison Charts use MH750 naming and not MH755 as to Sony they are one and the same product when it came to comparing with other earphones.
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Why the air venting system tech, pray tell? Well due to the small form factor of the MH series from Sony, the vent assist in their microstructures and offers superb bass performances and maintaining detailed clarity with the treble,

Thus why there are always 2 x solder dots to secure the driver/shell from vibrations in Sony IEM, dated as far from the beginning (see Image below of Sony Ericsson W800,MH700, etc IEMs), another awesome example is the microscopic MH1 IEM.

This tech alone shows why Sony is legendary and groundbreaking in audio fidelity even today!
IMG_20200929_0004184892.jpg
s-l500.jpg


A Myth-Busting Recap :

1. MH750/755 shares the same drivers
2. Only differences are the thin short or longer thicker cable with Mic variants
3. 2 different H/W variants verified through the years

2013/14 - Side Vent Drivers
2015-2020 - Newer Centre Vent Drivers

Both versions can be identified as genuine with Sony's trademarked 2 x Solder Dots

An Extremely rare side vent MH750 mfg 2014 taken from a Sony Xperia Z3-- Yes Side Vent Drivers are not exclusive to only the short cabled MH755..as Sony uses the same exact drivers with the MH750 too

Finale:

Good Luck to Everyone :) Now go find this hidden Gem Fast as its getting Rarer (Side Vent MH750/755 ) as we speak :)

Edit/ IMHO I actually prefer the newer centre vent variants MFG in 2015-2019 versions, due to its all-rounded MID/SUB Bass and less peaky treble signatures.
Last edited:
brianforever
brianforever
Thanks @aptquark glad it's useful and informative
Star Mastering
Star Mastering
Incredible stuff!
brianforever
brianforever
@Star Mastering Thanks Mate for your kind comments , very much appreciate it :)

Jogim

100+ Head-Fier
Pros: Incredibly good sound, extremely low price, can also be used as a headset, lightweight, build quality, sits very well in the ear
Cons: -
You can't go wrong with this IEM. Nothing better can be found at this price. And even in the $ 100 price range, it will be hard to find a better IEM. The sound is clear and balanced, the bass is deep and clean. The highs come brilliant. The mids are comfortable.
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chinerino

100+ Head-Fier
Pros: Very good sub-bass, clean bass with minimal mid bass bleed, good tonality, good timbre, good tuning, price to performance ratio
Cons: Poor build quality, a lot of fakes in the market, requires cable mods
Check out more reviews at: https://www.perrivanaudio.com/

Setup and price:
1 Dynamic Driver (17 SGD with shipping)

Intro

Disclaimer: This review was done by my own accord and I purchased this set at full price from eBay from KANOYA Japan.

The MH755 houses 1 Dynamic Driver and I bought it at about 12 USD (including shipping etc) at the time of my purchase, however its pricing may vary depending on sellers since Sony does not sell it on its own. It is also important to note that there are many fakes out there so do check out for its authenticity before any purchases are made.

Before we dive into build and sound, It is almost a must to do a MMCX modification to it since attached cable is so short which makes it very impractical in my opinion. It costs about SGD 25 to modify it nowadays or you can look up some videos online and do it yourself if you are savvy enough.


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My personal unit modified by SG AudioHive (ear tips: Final Audio Ear Tips size M)

Packaging and Accessories (Score: 3/10)

Nothing much to say here since it was an accessory itself, it comes in a plastic package containing the earpiece and tips. However I would like to point out that the stock tips are really good in terms of fit and quality so huge plus for the price you are paying!

Build and Fit (Score: 5/10)

The build here is typical for something like this (the free earpiece that comes with your phone) it is all plastic and not durable so really nothing great here since most of the value comes from its sonic characteristics and performance.
Fit wise, I usually wear it hanging down (unlike over ears) so it really depends on the tips to give you that seal and since given its design, lower your expectations when it comes to seal and fit (stock form) unless you tip roll to something that suits your ear. But I do have to say, it is relatively more comfortable to wear it for long hours as my ears get tired and discomfort from wearing IEMs for too long.

Sound

This is where it really shines for this unit, it poses a “Harman-Neutral” sound, good sub-bass extension with a peak in its upper-Mids which some may describe it as V or U shaped (in this case I would classify it as a U-shaped sound signature). The MH755 is fun to listen to, has good timbre and tonal balance for its price and is often described as a “wonder” for many.

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Taken from Crinacle.com/graphs

Sources used: (Topping D10 > Atom Amp) and (Ibasso DX120)

Bass (Score: 8/10)

I really love the sub-bass that MH755 has, it creates that rumble that can really satisfy my sonic cravings and it just became my go-to when it comes to songs with low bass. Mid-bass on the MH755 is relatively less emphasized as compared to sub-bass but it is not lacking or missing, “thumps” are still clean, fast, and textured or in other words, “the dynamic driver kind of bass”. In overall the bass here is boosted but not too much such that it overpowers other frequencies with minimal mid bass bleed.

To elaborate on its bass performance, I would say that I can single out the bass lines clearly despite having other frequencies playing at the same time (including vocals) but does not get in the way of clarity or sounding “muddy” which is something that I really like about it. Quality and quantity bass without losing clarity and tonal balance.

Mids (Score: 7/10)

Mids on MH755 is decent, vocals are clear but slightly recessed or less emphasized. Male vocals tend to sound fuller and deep due to the tuning of bass regions. Female vocals are generally clear however there is a peak around upper midrange (rising from 1khz and peaks around 3khz) which may sound slightly harsh on some songs but generally acceptable for me.

In general, the mids on MH755 are decent, not lacking and they are good enough for me to use it as a point of comparison for anything below SGD 100 which pretty much shows how well-tuned this unit is.

Treble (Score: 7.5/10)

The highs on MH755 are energetic and adds a little sparkle and air to the overall presentation but also at the same time smooth in my opinion (It is not sibilant to me as my sensitive regions ranges from about 7khz to 10khz which in this case is being rolled off from 7khz onward and treble addicts may feel a bit underwhelming.

Sound stage, Imaging and Tonality

Sound stage is pretty decent on this, I was able to feel that space that they recorded those tracks in and I would say it is pretty decent. Imaging on the other hand sounds a bit blurred even in binaural recordings.

An important point for this unit to perform is to achieve that seal and normally, IEM that are 3D printed or have “custom-like” shells can achieve that easily as long as the shell fits your ear properly. However, for the MH755, it is worn hanging down and the TIPS makes the world of difference here as it really diminishes its bass capabilities if you do not get a proper seal. It really depends on the tips that fit your ear but I am currently using slightly larger tips (Final ear tips size M or L) to achieve that seal.

Overall (Score: 8.5/10)

Value is key here because even though modifications are needed, the sonic performance of the MH755 at this price point is just unbeatable. There are other cheap modifications available such as a 3.5mm extension cable (it works but not pretty but it’s the cheapest) which you can explore if you don’t mind the looks. Also build wise it’s below average at best as compared to modern day offerings but for that level of sound, I do not mind buying multiple units just in case if mine starts failing.

Conclusion

I must admit that I was skeptical about the hype for MH755 and thought that it was just of the usual hype trains that people get excited about and then dies off when new products flush the old ones away, but I was obviously wrong. In fact, this might be one of the greatest sucker punches that Sony can pull in the entire audio industry. The MH755 is hard to fault with no obvious flaws or flags that I can think of at this price point and I recommend getting one before it disappears from the world in the future.
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Comments

Peddler

1000+ Head-Fier
I've just dug my pair out of the junk drawer after reading your article. They originally came supplied with the Sony SBH52 bluetooth 'amplifier' and to be honest I haven't ever given them a serious listen before - simply replacing them with some better iem's.

Pairing them up to the rather excellent AQUA + bluetooth headphone amplifier, they actually make quite a sweet combination. Easy to drive, short cable and comfortable fit. I shall try this combination out for a couple of days but based on my brief listening session I have to say I'm impressed.

Bass does appear to be slightly boosted but for my intended use (listening to music in bed - almost always resulting in me falling asleep with them in and the music playing) I will probably only be listening at low volumes.
 

yuriv

100+ Head-Fier
I've just dug my pair out of the junk drawer after reading your article. They originally came supplied with the Sony SBH52 bluetooth 'amplifier' and to be honest I haven't ever given them a serious listen before - simply replacing them with some better iem's.

Pairing them up to the rather excellent AQUA + bluetooth headphone amplifier, they actually make quite a sweet combination. Easy to drive, short cable and comfortable fit. I shall try this combination out for a couple of days but based on my brief listening session I have to say I'm impressed.

Bass does appear to be slightly boosted but for my intended use (listening to music in bed - almost always resulting in me falling asleep with them in and the music playing) I will probably only be listening at low volumes.
I'm glad you found my report somewhat useful. You could experiment by temporarily sealing the rear volume to see if it gets the bass to the preferred level. I updated my review with a photo in the "Tuning the response" spoiler section to make it clearer.
 

Slater

Headphoneus Supremus
Nicely done review! I just got my MH755, and am burning them in as I type this. Looking forward to putting them through their paces.

Does anyone know what material the diaphragm is made from? PEEK? Titanium? Biofiber?
 

yuriv

100+ Head-Fier
Nicely done review! I just got my MH755, and am burning them in as I type this. Looking forward to putting them through their paces.

Does anyone know what material the diaphragm is made from? PEEK? Titanium? Biofiber?
Thanks! As far as I can tell from searching online, the diaphragm material is unspecified. If Sead Smailagic is still active in the forums, I suppose you can ask him. For a product this cheap, though, I think they'd use an inexpensive material like mylar (PET), like other IEMs under $10.

From his writings, I get the idea that Sead shares the same sentiment as Sean Olive, who, when asked about what things determine sound quality, responded, "frequency response, frequency response, and frequency response!" Or Floyd Toole, who wrote that if you can't get that right, then "nothing else matters." They may have a point, because you can derive the CSD and the impulse response if the FR is fully specified in a minimum phase system. The engineering mentality is to use the cheapest material that gets the job done. I think Sead might have done just that.

I've been playing with more mods and measurements with this and the MH750 while revisiting my old MH1 IEMs. I might post the results of other mod ideas when I get the time.
 

JustBoris

New Head-Fier
I needed to make an account here just to say: "Thank you good Sir Yuriv."

Amazing review. By my opinion the best at head-fi.org.

After some "researching" i went with a safe buy and bought the most sold model of IEM-s on aliexpress, KZ ZST. You can imagine my reaction after i heard them. I am half deaf, have problem with tinnitus but after 10 sec i knew they are crap. Then i stumbled on Oluv's youtube channel and finally found someone normal in what i called "World of idiots". I saw much praise about HM1 and i was What is this now. I knew i have a pair and i checked them again. My sample was MH1c that came with Xperia Z1 i think (don't remember anymore), but it was original. My copy was just crap, bassy, muddy, no mids and everything sounds like its coming through a tube.
But i told my self "Oluv know some stuff" and ordered MH1. I was not disappointed. Bought the white version, they came with white and orange tips and sounded really nice (I don't know how they were stored, but they smell like yesterday made). I like them alot, but i can still hear that "coming through tube effect" if i don't play them at high volume.
Then i came across this review. After i spend +- 400e on crapy ever-ear headphones and few IEM-s, 10e for a mh755 was small price to pay.
My order came with just with 1 pair of tips (Seller sells other 2 pair separate). First thought was "I like those tips very, very much." Same sec after i played something i knew they are real. No burning and ears of half deaf person with tinnitus problem could hear this is really a gem. I ordered 4 more pairs few minutes later, going to do some recabling. Think i'll start with cable from ZST for practice (it's a new version of KZ cable, looks good and leaves impresion like it could last). Depending on results i'll put some pictures here :D.

To conclude, you good Sir Yuriv know your stuff.
 

yuriv

100+ Head-Fier
I needed to make an account here just to say: "Thank you good Sir Yuriv."

Amazing review. By my opinion the best at head-fi.org.

After some "researching" i went with a safe buy and bought the most sold model of IEM-s on aliexpress, KZ ZST. You can imagine my reaction after i heard them. I am half deaf, have problem with tinnitus but after 10 sec i knew they are crap. Then i stumbled on Oluv's youtube channel and finally found someone normal in what i called "World of idiots". I saw much praise about HM1 and i was What is this now. I knew i have a pair and i checked them again. My sample was MH1c that came with Xperia Z1 i think (don't remember anymore), but it was original. My copy was just crap, bassy, muddy, no mids and everything sounds like its coming through a tube.
But i told my self "Oluv know some stuff" and ordered MH1. I was not disappointed. Bought the white version, they came with white and orange tips and sounded really nice (I don't know how they were stored, but they smell like yesterday made). I like them alot, but i can still hear that "coming through tube effect" if i don't play them at high volume.
Then i came across this review. After i spend +- 400e on crapy ever-ear headphones and few IEM-s, 10e for a mh755 was small price to pay.
My order came with just with 1 pair of tips (Seller sells other 2 pair separate). First thought was "I like those tips very, very much." Same sec after i played something i knew they are real. No burning and ears of half deaf person with tinnitus problem could hear this is really a gem. I ordered 4 more pairs few minutes later, going to do some recabling. Think i'll start with cable from ZST for practice (it's a new version of KZ cable, looks good and leaves impresion like it could last). Depending on results i'll put some pictures here :D.

To conclude, you good Sir Yuriv know your stuff.
I'm glad my report turned out to be useful. The Audio Engineering Society (AES) published several papers by the Harman group led by Sean Olive. They have extensive research on what the majority of listeners prefer. I knew the MH755 would be a safe recommendation after seeing how well its measurements fit the science. Of course, I listened to it too, and I knew it would be a crowd pleaser. Lol.
 
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