The Sony MH755 are wired in-ear monitors (IEM) that have grown quite popular online, thanks to their fairly neutral sound profile at a budget-level price. Unlike most other headphones, you can't directly purchase them from Sony on their own. When they were first released, they were bundled with certain Sony Bluetooth devices like music players, which are now discontinued. Due to demand, third-party retailers with varying degrees of trustworthiness entered the market, offering only the IEMs. However, they're getting rarer to find as they aren't mass-produced. Also, due to their non-descript plastic packaging and cult popularity, it's easy to accidentally purchase a fake pair. We've even tested and reviewed a counterfeit version: the Sony MH755 (Fake).
We've managed to get ahold of a genuine pair via a seller on eBay, and they easily outperform the knockoff. Although they lack features like a mic or controls that more casual users may prefer, their sound profile is slightly bass-rich, with a touch of extra thump, body, and warmth that shouldn't overwhelm vocals and lead instruments. They also have a good build quality and aren't as prone to distortion at high volumes as the fake. However, some users may find their cable to be very short and impractical.
The Sony MH755 are good for neutral sound. They have a very slightly bass-heavy sound profile that adds a touch of extra thump, rumble, and boom to mixes. They're still neutral enough for a variety of audio content, though, and they can reproduce vocals and lead instruments clearly. They're also less prone to distortion at high volumes than fake units. However, their passive soundstage isn't very immersive, which is to be expected for most in-ears.
The Sony MH755 are sub-par for commute and travel. Unfortunately, they struggle to block out the low rumble of bus and plane engines and have a very short cable, so if you're using your smartphone, you won't be able to put it in your pocket. They also lack controls, so you need to use your device to adjust the volume or skip tracks. On the upside, they're decently comfortable, breathable, and have a well-built design.
The Sony MH755 are just okay for sports and fitness. They have a wired design, which could get snagged on something while you're moving and pull them out of your ears. They also lack an IP certification for dust and water resistance. That said, they have a decently comfortable and stable in-ear fit.
The Sony MH755 are middling for office use. They don't have any controls, have a very short cable, and lack a mic, which can be a little frustrating if you need to take calls. However, they have a comfortable and breathable fit. They also have a well-built design and don't leak too much audio at high volumes, so you shouldn't disturb your coworkers if you like to jam to your favorite tunes with the volume up.
The Sony MH755 are wired headphones, and you can't use them wirelessly.
The Sony MH755 are acceptable for wired gaming. If you don't need a mic, you can use them on any console so long as it has an AUX port. These in-ears have a slightly bass-heavy sound profile that can help emphasize sound effects in your gameplay. They also have a decently comfortable fit and feel well-built. However, they lack controls, and their passive soundstage isn't very immersive or open.
The Sony MH755 aren't suitable for phone calls as they don't have a mic.
The Sony MH755 look very similar to the Sony MH755 (Fake), although the real deal's left and right driver cables are longer by 3.9 inches (10 cm). They have an uneven white cable design as you're supposed to wear the right driver's cable behind your neck so that they don't fall on the ground when you're not using them.
These IEMs have a decently comfortable fit. Like the Sony MH755 (Fake), they're lightweight and don't have a deep in-ear fit. They also don't put too much pressure on the insides of your ears, and their ear tips are a bit softer than the fake product. However, their audio cable is still very short and can get hooked on something, especially since the cable is shorter on the left side than the right side.
Like most in-ear headphones, these in-ears have an outstandingly breathable fit. They don't trap in heat, and your ears shouldn't feel warm over time, even if you're wearing them during a run in the park or reps at the gym.
The Sony MH755 are very portable. They have a small, lightweight design and should easily fit into most pockets and bags without an issue. However, they don't come with a carrying case to help protect them.
These in-ears have a good build quality. They feel significantly better than the Sony MH755 (Fake), and we noticed several differences in build:
Overall, these in-ears are well-built. Their ear tips feel softer and their silicone cables feel of better quality than the fake. However, they lack an IP certification for dust and water resistance.
The Sony MH755 are decently stable. Although they have a short audio cable, which can get snagged on something and pull them out of your ears, their in-ear fit doesn't move around much.
The Sony MH755 have a slightly bass-rich sound profile that adds a touch of extra thump, punch, and boom to your mixes. It shouldn't muddy vocals or lead instruments much, though. Overall, the sound profile is also much more neutral-sounding than the Sony MH755 (Fake). However, the IEMs lack an EQ to help customize their sound to your liking.
These in-ears have fantastic frequency response consistency. Once you achieve a proper fit and seal using the included ear tips, you should get consistent audio delivery each time you use them.
The Sony MH755 have great bass accuracy. Although slightly overemphasized across the range, resulting in extra thump, rumble, and boom, it's still more neutral and flat than the Sony MH755 (Fake). It shouldn't overwhelm your mixes too much, though.
These headphones have excellent mid accuracy. Unlike their counterfeit counterpart, the range is fairly flat, so vocals and lead instruments are clear and detailed. However, a small dip in the mid-mid can nudge vocals and lead instruments to the back of the mix.
The treble accuracy of these in-ears is excellent. The low-treble is very flat, so vocals and lead instruments are present and detailed. A small dip in the mid-treble can slightly weaken sibilants like S and T sounds.
The Sony MH755's peaks and dips performance is excellent. A dip in the mid-mid nudges vocals and lead instruments to the back of your mix, while a bump in the low-treble can make their upper harmonics sound a bit harsh. The mid-treble is a bit uneven, so sibilants like cymbals are alternatingly dull and piercing.
The imaging performance is fantastic. The group delay response falls below the audibility threshold, which results in tight bass and transparent treble reproduction. The left and right drivers are also well-matched in phase, amplitude, and frequency response, which is important for the accurate placement and localization of objects like footsteps and instruments in the stereo image. While there's a small peak in the phase response's high-bass to low-mid range, it shouldn't be audible in regular content for most users. That said, our results are only valid for our unit, and your experience may vary.
These in-ears have a bad passive soundstage performance, which is to be expected. To create an out-of-head and speaker-like soundstage, the outer ear has to be activated with sound resonances. However, IEMs bypass the outer ear completely, and as a result, their passive soundstage doesn't feel very immersive. It also doesn't sound as open as open-back headphones like the Apple AirPods (2nd generation) Truly Wireless.
These headphones have an excellent weighted harmonic distortion performance. All frequencies fall within good levels, which results in clear and pure audio reproduction.
These are the settings used to test the Sony MH755. Our results are only valid when using these settings.
The noise isolation performance is satisfactory. They don't have active noise cancelling (ANC) and rely on their passive noise isolation capabilities to block out sound. That said, they struggle to cut down the low rumble of bus and plane engines. They can reduce mid-range noise like office chatter, though, and can effectively block out high-pitched sounds like the hum of an AC unit.
The leakage performance is outstanding. Leakage is concentrated mostly in the treble range and sounds thin. However, it falls below the threshold of an average office, so even if you like to listen to audio at high volumes, your coworkers shouldn't be able to hear it.
These headphones use a 1/8" TRS cable. The segments that connect to the left and right buds are longer than the Sony MH755 (Fake). The cable to the left earbud is 22.8 inches (58cm) long, while the right earbud's cable is 30.7 inches (78cm) long.
You can connect these headphones to PCs by plugging their 1/8" TRS connector into an AUX port. However, they can only receive audio.
The Sony MH755 can only receive audio when connected to PS4 and PS5 consoles via an analog connection.
These headphones are compatible with Xbox One and Xbox Series X|S consoles when connected via analog. However, they don't have a mic and can only receive audio.
The Sony MH755 come in a few color variations, although it's hard to know which colors are genuine, especially as these in-ears weren't directly sold by Sony on their own. Users also tend to modify their cables and ear tips to fit their usage. However, you can see our model's label here. Note the placement of the garbage symbol on the bottom of the label, not the top of the label, which is one of the ways to tell if your pair are genuine or counterfeit. You can also see a comparison between our genuine unit and our fake unit's label here.
If you come across another variant, please let us know in the discussions, and we'll update our review.
The Sony MH755 are budget-level IEMs that are hard to find genuine. If you manage to get a real pair, they have a slightly bass-rich sound profile that adds a bit of extra thump, rumble, and boom to tracks. It's not too overwhelming, though, so vocals as well as lead instruments sound clear, accurate, and detailed. They also have a significantly better build quality than the Sony MH755 (Fake), and they can block out more background noise. However, they may not be suitable for users looking for a versatile audio experience as they lack controls and a mic.
The genuine Sony MH755 are better headphones than the counterfeit Sony MH755 (Fake), which is to be expected. The real pair have a significantly better build quality, a more neutral sound profile, which some users may prefer, and their audio cable is longer. They can also isolate you from more background noise.
The Samsung AKG Type-C and the Sony MH755 have different strengths, and you may prefer either one. The Samsung use a USB-C connector and can only connect to corresponding devices such as newer smartphones. They're also more comfortable and have an in-line mic, which is handy if you like to take calls on the go. However, the Sony use a 1/8" TRS cable. They have a more stable in-ear fit, their sound profile is somewhat more neutral, which some users may prefer, and they can block out more ambient noise around you.
The Sony MH755 are better in-ear monitors than the TIN Audio T2. The Sony are more comfortable, have a more neutral sound profile, which some users may prefer, and have more consistent audio delivery. They're also able to block out a bit more background noise. However, the TIN are better built.
The Sony MH755 are better in-ears for neutral sound than the 1More Triple Driver. While both headphones are decently comfortable, the Sony are better built, have a more neutral sound profile, which some users may prefer, and can block out more ambient noise. However, the 1More are more versatile as they have a mic and in-line controls.
The Samsung Galaxy Buds+ Truly Wireless and the Sony MH755 have different strengths, and you may prefer either one. The Samsung are truly wireless earbuds with a more comfortable and stable fit, their sound profile is more neutral, which some users may prefer, and they have a mic so they can take calls on the go. However, the Sony can block out more ambient noise, and thanks to their wired design, have virtually no latency.
The Sony WI-XB400 EXTRA BASS Wireless and the Sony MH755 have different strengths, and you may prefer either one. The MH755 are more designed for neutral sound, are better built, and have a more neutral sound profile. They can also block out more background sound. However, the WI-XB400 are better-suited for casual use as they have a wireless design and have an in-line mic. They also have a more bass-heavy sound profile, which some users may prefer, and a basic control scheme.