Sennheiser MOMENTUM True Wireless

General Information


Uncompromised sound performance, state-of-the-art technology and refined design all come together in Sennheiser’s True Wireless premium earbuds.

The first model in a new generation of the iconic MOMENTUM family redefines the audio benchmark for true wireless ear buds with superior stereo sound performance that is guaranteed by Sennheiser’s audiophile 7mm dynamic drivers. With the latest Bluetooth technology, AAC codec support, and Qualcomm® aptXTM compatibility, this exceptional hi-fi sound is delivered without any compromise. “The MOMENTUM range has always stood for a fusion of excellent sound, progressive technology and craftsmanship. We are pleased to now introduce the newest member of the family, which brings the essence of MOMENTUM to a truly wireless form for the first time”, said Frank Foppe, Product Manager at Sennheiser.

Sense your world

Thanks to its Transparent Hearing feature, MOMENTUM True Wireless gives listeners the option of blending ambient sounds into their listening experience for improved situational awareness, or to participate in conversations without removing the ear buds.

A smart, connected wireless experience

MOMENTUM True Wireless offers effortless interaction with one’s digital eco system by enabling direct voice access to smart assistants such as Apple Siri or Google Assistant. Be entertained, communicate, and stay informed - all via a simple tap of the intuitive touch interface and natural voice commands. Noisier environments present little challenge thanks to the two-mic-beamforming technology, which optimizes voice pick-up for crystal clear phone calls and voice assistant interaction. The MOMENTUM True Wireless experience can also be personalized via the free Sennheiser Smart Control app, allowing fine-tuning of the sound according to personal preference via the ear buds’ built-in EQ. The app will be released once the product is available.

Sennheiser’s new MOMENTUM True Wireless earphones set new standards for audio quality, with characteristic MOMENTUM style and comfort.​
The MOMENTUM True Wireless allows users to be entertained, communicate, and stay informed - all via a simple tap of the intuitive touch interface and natural voice commands.​

Enjoy true wireless freedom in style

MOMENTUM True Wireless has a 4-hour battery life that can be recharged via its compact case with integrated power bank for more than 12 hours of all-day enjoyment. Designed for a perfect fit and all-day comfort, the splash- and sweat-resistant earphones have been meticulously crafted to offer a sense of timeless elegance and durability. On opening the fabric-wrapped case, one discovers finely sculpted ear buds that have been beautifully finished with metallic details on the outer face as well as gold-plated charging pins and magnets.

Technical Data

•Speaker typeDynamic
•Sensitivity107 dB SPL (1 kHz / 1 mW)
•THD, total harmonic distortion<0,08% (1kHz / 94dB)
•Frequency range5 Hz to 21 kHz (earbuds)
100 Hz to 10 kHz (microphone)
•Microphone sensitivity94 dB SPL at 1 kHz
•Battery SpecificationBuilt-in Lithium rechargeable battery
°Charging timeApprox. 1.5 hrs
°Battery runtime[/b]Up to 4 hrs (A2DP) with rechargeable batteries of the earbuds,
Up to 12 hrs with rechargeable battery of the charging case
•Power supply5 V, 650 mA: USB charging via USB-C socket at charging case
•Bluetooth VersionBluetooth 5 compliant, class 1
°Supported ProfilesA2DP, AVRCP, HSP, HFP
°Type of CodecSBC, aptX™, aptX™ Low Latency, AAC
•Ear couplingEar Canal
•Dimensions78.6 x 45 x 35 mm (charging case)
•Weight69.8 g (earbuds and charging case),
13.2 g (both earbuds),
56.6 g (charging case)
•Operating temperature0 to +40°C
•Operating relative humidity10 to 80%, non condensing
•Water Protection CodeIPX4, splash resistant (earbuds)
<0,08% (1kHz / 94dB)[/tr]

Latest reviews


100+ Head-Fier
Wireless Joy: The Sennheiser Momentum TW 2 Bluetooth IEM's
Pros: Great sound, battery life and Bluetooth range. Latest firmware update mitigates some connectivity clumsiness.
Cons: Noise cancellation isn't best in class, clunky styling for some, "Side Tone" doesn't totally eliminate "stuffy head" sensation on phone calls.
Hi, Folks: These are concluding excerpts from my comprehensive review of the SENNHEISER MOMENTUM TW 2 Bluetooth IEM's. Note that this is the revised, version 2, which addresses the weaknesses (such as battery life) of the original version. I don't see any reviews of the newer version here, so I wanted to share this.

If you'd like to read the full review, its on my blog, Steve's Audio Blog. Enjoy!

sennheiser - 1.jpeg


I’ll get to the sound of the Momentum TW 2’s in a moment, but first let’s cover a few general performance parameters.

FIT — As for fit and other ergonomic considerations, I am quite pleased with the comfort of the Momentum TW 2’s. Fit is a very personal thing (unlike me, my wife finds her AirPod Pro’s super comfortable), so I’d always recommend purchasing any IEM’s or even full-size headphones from a dealer with a generous return policy. I find the Sennheiser’s to be almost forget-you’re-wearing-them comfortable, with a smooth inner surface devoid of sharp edges that might irritate the ear. Furthermore, at a mere 6 gm per side, the TW 2’s are among the lighter IEM’s out there.

BATTERY LIFE — The TW 2’s are currently my daily, go-to earbuds, and I don’t think I’ve ever received a low battery warning. Sennheiser claims 7 hours of continuous battery life, extendable to 28 hours with the battery case’s reserves. Additionally, the USB-C charging port on the case makes quick work of topping off the battery.

BLUETOOTH RANGE is excellent. I can leave my Bluetooth source in one room and and walk all over our two-story house (and even out onto the front porch) and rarely will the sound drop out or stutter. This is very impressive.

PHONE CALLS — I’ve found the Momentum TW 2’s to function reliably for making and receiving telephone calls, and I’ve never had a caller complain that my voice wasn’t coming through clearly on their end of the conversation. That said, I haven’t usually enjoyed taking calls on most wired or wireless earbuds or headphones because of the “stuffy head” sensation that makes it difficult to hear your own voice while you speak. The TW 2’s are supposed to alleviate this sensation through a feature Sennheiser calls Side Tone, which mixes the microphone input into the earbuds’ output. Unfortunately, unless I’m doing something wrong, I haven’t found Side Tone to create that open, natural sounding phone call experience. If my aural memory serves, the AirPod Pro’s did the best job of making phone calls sound relaxed and natural.

BLUETOOTH LATENCY, that is, the time lag inherent in Bluetooth transmission, is largely dependent on the codec (compression/decompression scheme) and hardware implementation of the transmitting and receiving devices. It’s not an issue with music files alone, but when video is involved, as in smart phone and computer games or movies and streaming videos, too much latency will result in a very irritating lack of synchronization between audio and video, causing sound effects and dialogue to lag behind the on-screen action. In the case of the Momentum TW 2, whether watching YouTube videos or playing a video game, I have found Bluetooth latency to be so minuscule as to be nearly imperceptible.

ACTIVE NOISE CANCELLATION is, frankly, slightly disappointing. Right now the Momentum TW 2’s are in my ears. I can hear the sound of my keyboard clicking as I type, but the “whooshing” of the central heat in my room is almost entirely deadened. I was also able to listen to music with our Roomba robot sweeper grinding away in the kitchen while doing the dishes with much of the noise of the Roomba muffled. On the other hand, the masking of other people’s conversations in line at Starbucks or construction noises in my neighborhood while I’m walking is only so-so. I fortunately did have the chance to use my TW 2’s on a commercial flight (yes, I was properly masked and socially distanced from other passengers) some months ago. Again, they did a decent job subduing jet engine and other noises during the flight, so that I didn’t have to crank the volume dangerously loud in order to hear my music over the drone of the engines, but you’re not going to get the kind of isolation that you’d experience with a pair of full-size, noise-cancelling headphones like my Sony WH 1000XM3.


This is where the Sennheiser Momentum TW 2’s really shine. I am regularly startled by just how refined, lively and resolving they are. Listening, for example, to dense vocal harmonies, whether it’s Crosby Stills and Nash’s Helplessly Hoping or Billie Eilish’s Party Favor, nothing is smeared or obscured; pick out any vocal line you choose and it’s easy to follow. Indeed, well-recorded voices in general sound completely fleshed out and human.

Billie Eilish’s debut EP, “Don’t Smile at Me.”

The upper midrange and treble, too, are sweet and clear. By “sweet” I don’t mean rolled off or muffled, but rather that the Momentum TW 2’s don’t add any obnoxious emphasis (masquerading as “detail”) to the upper mids and highs. Cymbals and vocalists’ “s” sounds don’t feel like torture, unless the track was recorded with a synthetic, hard, vocal emphasis. (Lamentably, this is now par for the course in too many pop recordings, but at least the TW 2’s won’t add their own ugly edge to that bright, thin, studio equalization.)

The low end is pretty close to my ideal. The TW 2’s will dig very deep when that’s called for (the bass lines in the opening bars of Donald Fagen’s Morph The Cat come to mind) but the low end is well controlled and the default sound signature overall isn’t “dark” or “veiled” by the omnipresent mid-bass “hump” that plagues too many consumer oriented headphones and IEM’s. So yes, the TW 2’s will do justice to EDM and other genres that showcase fat synth bass lines.

Finally, the imaging and soundstage width and layering of the Momentum TW 2’s is shockingly good. Live albums like James Taylor’s classic Live 2-CD set put you in the theater, surrounded by happy, whooping JT fans. Well recorded pop albums like Sade’s Promise
sennheiser - 2.jpeg
will thrill you with a nearly surround sound presentation, as in the organ/synth chords near the beginning of War of the Hearts.


As noted earlier, the Sennheiser Momentum TW 2 Bluetoot IEM’s aren’t perfect: noise cancellation could be better, phone calls still have a somewhat “congested” feel, and they’re not the prettiest earbuds ever created, but for sheer musical pleasure, they’re a great pair of in-ear monitors. Sennheiser is a long-established, serious provider of professional and consumer microphones and headphones, and that lineage is amply manifested in the Momentum TW 2 IEM’s. Highly recommended.

That’s it for this post, everyone. See you next time… and in the meantime, be kind to others, stay safe, mask up, and enjoy your music!


sennheiser - 1.jpeg
  • Like
Reactions: Evshrug


Headphoneus Supremus
Pros: Feature set (Transparent Hearing esp.) – Refined tune – Amazing connection strength through obstacles
Cons: Will only pair with one device at a time – Underwhelming battery life – Touch controls are a mixed bag

Today we're checking out Sennheiser's entry into the burgeoning truly wireless earphone market, the Momentum True Wireless.

Anyone who knows anything about audio, portable or otherwise, will be familiar with the name Sennheiser. Whether you're talking consumer headphones, earphones, or professional microphones, Sennheiser is a name that oft crops up when talking about the best of the best. Their products can be found everywhere from recording studios to a student's backpack.

Is Sennheiser's first entry into the truly wireless market a success or will the Momentum True Wireless (MTW) be forgotten in short order? Let's find out.


A big thanks to Everett with Sennheiser for reaching out to see if I would be interested in reviewing the Momentum True Wireless, and for arranging a loaner unit for the purposes of review. The thoughts within this review are my own subjective opinions based on over a month using the MTW and do not represent Sennheiser or any other entity. At the time of writing the MTW retailed for 299.95 USD.

Product page:


Personal Preference:

I listen primarily to various EDM sub-genres (liquid drum and bass, breakbeat, drumstep, etc.), hip hop, and classic rock. My preferences for earphone tuning are quite relaxed and as such their is no one signature I look for. The HiFiMAN RE800, Brainwavz B400, and Massdrop x MeeAudio Planamic are examples of earphones with wildly varied signatures that are enjoyable for different reasons. I generally listen at very low volumes, so keep this in mind when perusing my thoughts on how an earphone sounds.

  • Dimensions: 78.6 x 45 x 35 mm (charging case)
  • Microphone: MEMS
  • Bluetooth Version: Bluetooth 5.0 compliant, class 1
  • Supported Profiles: A2DP, AVRCP, HSP, HFP
  • THD, total harmonic distortion: <0,08% (1kHz / 94dB)
  • Ear coupling: Ear Canal
  • Weight: 69.8 g (earbuds and charging case), 13.2 g (both earbuds), 56.6 g (charging case)
  • Charging time: Approx. 1.5 hrs
  • Microphone sensitivity: 94 dB SPL at 1 kHz
  • Operating temperature: 0 to +40°C
  • Power supply: 5 V, 650 mA: USB charging via USB-C socket at charging case
  • Battery Specification: Built-in Lithium rechargeable battery
  • Frequency range: 5 Hz to 21 kHz (earbuds)
    100 Hz to 10 kHz (microphone)
  • Sensitivity: 107 dB SPL (1 kHz / 1 mW)
  • Speaker type: 7mm Dynamic
  • Operating relative humidity: 10 to 80%, non condensing
  • Battery time: Up to 4 hrs (A2DP) with rechargeable batteries of the earbuds, Up to 12 hrs with rechargeable battery of the charging case
  • Water Protection Code: IPX4, splash resistant (earbuds)
  • Type of Codec: SBC, aptX™, aptX™ Low Latency, AAC
IMG_4927.JPG IMG_4928.JPG IMG_4929.JPG

Packaging and Accessories:

The MTW's packaging has a very eye-pleasing looking with a combination of the soft blues and whites familiar to the brand. On the front of the lid is a high quality image of the MTW's earpieces and the charge case, along with some highlighted features, like the ability to play music and take calls, touch controls, access to your phone's voice assistant, and battery life. Around the rest of the package you find some other handy tidbits, like support for aptX and aptX Low Latency codecs, as well as Bluetooth 5.0 support.

Lifting off the lid you find the earpieces and charge case nestled safely within laser-cut foam inserts. Lift out the foam insert and you find a smaller cardboard box containing the usual documentation (quick start guide and safety information) and the accessories. In all you get:
  • Momentum True Wireless earphones
  • Charging case
  • Single flange silicone tips (xs/s/m/l)
  • USB-C cable
Overall a pretty unremarkable, surprise-free unboxing experience. Given the MTW's price, I would have liked to see Sennheiser provide a wider variety of tips options, like bi-flange and foam, even though the stock medium tips were perfect for me and used for all of my testing.

Build and Comfort:

The MTW's earpieces are primarily plastic save for the logo-emblazoned metal touch pad, or “spin ring” as it's called on Sennheiser's product page. And the gold-plated charging pins. The plastics are of a very high quality with a matte finish that feels good to the touch, though I wish it was more grippy. It's not uncommon for them to slip out of my fingers when removing them from the charge case. The powerful magnets that snap them into place are also partly to blame. I can't tell you how many times I've dropped them because of this. On the plus side, this unexpectedly tested the plastic's toughness, showing off how resilient it is to scratches and marks; i.e. very. Build quality of the earpieces overall is quite good, though there are some things I would like to see addressed in a future revision. First, the nozzles are open with a simple piece of foam preventing dust and gunk from getting inside. There is no screen leaving the foam open to removal, either on purpose or by accident. At least stick a basic screen on there. Second, while fit and finish is excellent, there is a deep, tapered seam that runs the length of the base of the body of each earpiece. It is clear that this was intentional since this design element is present on the charge case too. While it looks nice and provides a consistent design across all aspects of the product, unfortunately it tends to collect skin, wax, dust, etc. and requires semi-frequent cleaning. The edge is also just a bit too sharp and after 45 minutes or so causes some mild discomfort. Users would benefit from it being smoothed out a bit, if not removed entirely. While the consistency in design looks nice, it's not quite worth the negatives, as mild as they are.

The charge case is a stylish piece of equipment with a grey cloth exterior dominating the design. A rubberized Sennheiser logo can be found on the top, while the bottom contains a plastic plate with relevant disposal and compliance logos, in addition to the model number and an address for Sennheiser. Out back is a USB-C port with an LED to the left and a small button to the right. Without the earpieces inserted into the case, this button will indicate the case's remaining battery life. With the earpieces inserted, you get their battery life. Lift the lid and you find a plastic base with inserts for the earpieces. They are perfectly formed to the shape of each earpiece so you don't have to worry about carefully lining up the charge pins. Just match the each earpiece to it's respective insert (left to left, right to right) and drop them in. Strong magnets do the rest, pulling and holding them securely in place for charging and/or storage. The plastics used on the case are just as high a quality as found elsewhere, and the cloth exterior is grippy and seems to do a good job of resisting dirt and stains. Continuing the design of the earpieces, around the edge of the lid and base is a tapered ridge which breaks up what would end up being a monotonous design were it all grey cloth. About the only aspect of the case I'm not fond of is the hinge. The design is fine and I like the way it snaps the lid shut, mimicking the feel of using magnets, it's the materials I'm worried about. It's all plastic and there is A LOT of flex when pushing on it. This might be fine in warm weather where if dropped the lid will flex to absorb the impact, but in colder climates plastic gets brittle and brittle things break.

As is the hot topic with truly wireless products right now, how accommodating is the charge case of various ear tips during charging? I'm going to have to eat my earlier words about the HIFIMAN TWS 600 being the best I've tried to date, because that title goes to the MTW. Let me just cut in an except from the TWS 600 review addressing this, edited to accommodate the MTW.

“Let's compare cases and tip compatibility with the Nuforce BeFREE8, SoundPEATS TrueFree+ and Q26, Astrotec S60 and S60 5.0, and the Sennheiser Momentum True Wireless (MTW). Most of these are designed to accommodate at most the preinstalled medium sized single flange tips. Few can take the stock large. None but the MTW can accommodate the chunky Xiaomi tips that work fine with the HIFIMAN case. None but the MTW can take standard medium foams (Comply or otherwise) without compressing them first. None work with the insanely long double or triple flange tips HIFIMAN provides with the TWS 600, will nor do other third party options fit, though the MTW will accept some shorter bi-flange options. HIFIMAN comes out way ahead of all but the MTW with a case that is much more flexible when it comes to charging the ear pieces with a variety of different tips attached. Also in Sennheiser's favour, their case has a hollow lid allowing you to carry your detached tips with the earphones, should they not fit ”

When it comes to comfort, the MTW is quite good, though there are a couple knocks against it. First is that aforementioned edge that runs around the rim of each earpiece. It's a tad sharp in places and for me reduces the MTW from being an all-day wear to a 45 minute wear with short breaks. The earpieces are also quite large in circumference, ~23mm at their widest point. They fit similarly to an earbud, but with a short nozzle added to accommodate some ear tips. I prefer earphones with a shallow fit and love how most earbuds slot into place so I'm cool with the MTW. However, if you're not so lucky and have issues getting earbuds to fit, you might want to find somewhere you can try these on first. Those with small ears may also want to keep the size of these in mind when considering them. I'll say they're comfortable, but with an asterisks (*).

IMG_4933.JPG DSC_1135.JPG IMG_4944.JPG


Normally I fold this into the previous section, but MTW has a 'Transparent Hearing' feature accessed through the Smart Control app. This feature allows you to use the onboard microphones in each earpiece to pipe in the environment around you, thereby overriding any passive isolation.

Passive isolation is about average for a dynamic based earphone, maybe slightly above. There are plenty of places for noises to bleed through, so the clacking of keyboards, cars driving by, people chatting, etc. all come through, it's just dulled and mostly incomprehensible. I found it quite suitable in noisy areas, like the local Tim Hortons coffee shop, on my evening walks through the city, and when grocery shopping.

Hopping into the app and turning on 'Transparent Hearing' changes everything. Gone is that decent isolation replaced by the environment around you coming through loud and clear. People, cars, whatever. You hear it all. The only other product I've used that features similar tech is the Radsone ES100, and there is no comparison. The ES100 provided nowhere near the same amount of information, and without the same level of immediacy. There is very little delay between the noises around you and what the MTW pipes through, something I find extremely important when using this feature. If you need to react, you're not reacting to a significantly delayed sound. And if you work in an office, the MTW should definitely be on your shortlist. You can listen to your music while working without having to worry about missing, a phone call, someone call your name, etc. And if you need to pause your music to chat with someone, simply remove one earpiece which stops the music. Awesome.

Sources and Connection:

The Momentum True Wireless was tested with a number of devices; LG G5, LG G6, Shanling M0, Shanling M1 and an ASUS FX53V laptop. Connecting for the first time is as straightforward as it is with most products. Once you take the earphones out of the case, press your finger against the touch sensitive pads for 5 seconds and the earphones will announce they've entered pairing mode. Find the MTW on your device (it shows up as MOMENTUM TW), select it, and you're done. The pairing will be remembered in the future and auto-connect whenever possible.

One thing I'm not fond of is that the MTW can only be paired to one device at a time, or at least that's how it has been in practice. Switching from one device to the other always requires forgetting the original connection, and pairing again. Not a huge deal, but for those used to having their earphones connected to 2+ devices at a time and swapping between them, as I do with my laptop and wireless device of the moment, it gets tiring having to repair constantly.

One connected, how is the connection quality? Pretty good. Every once in a while the left earpiece will briefly disconnect from the right, but it's fairly rare. On one, occasion after removing an earpiece to pause the track and talk to my wife, music would play intermittently upon unpausing. I've experienced this with another product, requiring a fresh pairing of the devices to fix. Other than that, the connection quality is very reliable, even over fairly long distances and with obstacles in the way. Paired to my LG G6, I can leave the phone in my office and step just outside my apartment before the connection begins to falter. The front door is through three rooms and two hallways, around a90 degree corner and with a bathroom separating it all. That's nuts. Some of my other TWS earphones will allow me to walk around the entirety of the apartment while retaining a solid connection, but none can do what the MTW can. It is truly impressive.

IMG_1456.JPG IMG_1465.JPG IMG_1467.JPG

Battery Performance:

Less impressive is the battery life. Four hours of listening with two additional charges via the case totalling 12 hours of total use. That's not terrible by any means, and has been good enough for my use cases, but it's not good either. The MUCH smaller and more compact Astrotec S60 5.0 manages 16 hours of combined listening time. The sub-50 CAD SoundPEATS TrueFree+ provides 30 hours of combined listening time. The HIFIMAN TWS 600 provides a combined total of 38.5 hours. I'd be okay with 12 hours if the Momentum True Wireless was very compact, but it's not. The case is reasonably small and easily pocketed, but the earpieces are quite large.

On the other hand, this battery life makes sense given the features and technology within, but most people won't be taking that into consideration. They'll just read a spec sheet, see 12 hours, and think it's not enough when X brand gives you double the battery life. I really hope Sennheiser looks into bumping up the battery life considerably with their next release, if only to please spec-heads.

Firmware Update:

Updates seem to be automatically applied via the Smart Control app. There's not much to say here beyond the process being painless, and wow, does it take a long time. They warn you though, and since you can use them while the update is occurring, it's not a big deal. You only need to stop listening right at the end of the update process to drop the earpieces into the case to finalize the installation. Easy peazy.

Smart Control App:

The app is a free download and pretty basic in it's functionality. I appreciate that to be honest. While something like the Earstudio app Radsone created to accommodate the ES100 is amazing in the features and added functionality it brings to the device, for the average user it's a lot to take in. The Smart Control app keeps things simple. On the home page you see the remaining battery life and two options: Transparent Hearing and Equalizer. Under 'Transparent Hearing' you have the option to turn it on, and decide whether or not you want music playing in the background while it is on. Simple and self explanatory. The Equalizer is a bit more interesting.

Instead of the usual multi-band sliders used by everyone else, you are greeted by a unique interface. Up North is a plus sign, South a minus sign, East covers bass, West is your treble, and dead centre sits a white dot. The idea is that you move that little dot around the screen and tailor your sound. It's not as flexible as a traditional equalizer, but it's undoubtedly more fun to use and for someone that is not familiar with frequencies and/or is easily overwhelmed by dials and sliders, this is going to be a great tool to help them customize the sound of their MTW.

That said, I don't use the equalizer. I prefer more control over each frequency, but also, for whatever reason half the time I try to move the dot, when I let go to leave it in the area with a sound I like, it jumps to the top left corner ruining my selection.


The MTW eschews traditional buttons for touch sensitive pads on each earpiece. I'm kinda old school and prefer things that are packed to the brim with buttons, dials, etc. Tactile feedback all the way. That said, the touch controls here worked well enough to be plenty usable.

Each earpiece has it's own suite of controls. The left handles music functions with a single tap to play/pause, a double tap to skip a track, and a triple tap to go back. A single long press will also reduce volume. The right handles call functions with a single tap accepting and ending a call, and a double tap rejecting a call. A single long press will increase volume. Lastly, a a double tap will turn on/off the 'Transparent Hearing' feature.

Overall the controls are quite standard and fairly intuitive. Though, actually using them is made a bit more difficult thanks to the use of touch sensitive pads. Placement of the finger and the speed at which you complete multiple presses all affect how successful you will be in achieving the desired function. You need to be fairly precise and methodical. It would have been neat to see Sennheiser do something a little more unique, such as moving your finger around the ridge of the pad to adjust volume. While I still prefer more tactile controls, the touch sensitive route Sennheiser used works decently well and probably helped them more easily achieve the IPX4 splash resistance rating the MTW has, so that's a plus.

IMG_5148.JPG IMG_5145.JPG IMG_5147.JPG

Sound Quality:

The Momentum True Wireless has what I consider a pretty typical signature for truly wireless products. That being a v-shaped sound with plenty of bass to cut through and maintain presence regardless of outside noise, and sparkly treble to add excitement and keep your blood pumping. While this style of tune isn't necessarily anything special, Sennheiser keeps it refined resulting in a very pleasant sounding earphone.

The treble presentation is a highlight in my opinion. It is detailed and crisp with a slightly lean note weight, yet it comes across extremely light and airy without any harshness or grain. It's lively and sprightly, and simply a joy to experience. Even tracks with nasty, overly aggressive treble like The Crystal Method's “Grace feat LeAnn Rimes” work with the Momentum True Wireless. Decay is reasonably quick letting the MTW handle heavy-handed cymbals fairly naturally. This is a truly wireless product that ends up being quite enjoyable with metal, like Havok's album 'Time Is Up'.

The mid-range, while slightly recessed, is in no way overshadowed by the bass or treble. Vocals are naturally weighted and sibilance free, blending in well with the rest of the presentation. Female vocals come across especially sweet with a warmth and emotion to them that is lacking in a lot of other products, such as on Celine Dion's “Ashes”. Through the MTW, her performance is every bit the powerhouse you expect from such an accomplished vocalist. This is actually one of the few earphones that gave me goosebumps with that track, particularly at 1:10 when the bass kicks in and Celine's vocals swell. So good.

Speaking of so good, the MTW's low end is fantastic. Depth is phenomenal for a wireless product with deep basslines rocking you with a slow rumble, such as that aforementioned moment in “Ashes”, and the opening section of Kavinski's “Solli”. EDM and hip hop fans are very unlikely to find themselves wanting extra low end from the MTW, unless they are true bassheads. Depth is good, but so is texture. It's not among the most information rich earphones I've tested, but all the relevant detail in each note is there meaning the grimy basslines inherent to The Prodigy and Tobacco are every bit as crunchy as they need to be.

The Momentum True Wireless' sound stage is also quite satisfying for a truly wireless product. While stage depth isn't anything special, width is fantastic with notes flying off into the distance giving the impression of a fairly open and spacious listening experience. Imaging is good, right in line with the best truly wireless products I've heard. There are no vague spots off centre, or odd channel to channel transitions. I think these would work fine for mobile gaming. Layering is also good but the previously mentioned lack of depth does show on congested tracks, such as the closing minutes of King Crimson's “Starless and Bible Black”. Thankfully separation is good, so you rarely have to worry about instruments colliding and smearing into each other.

Overall I find the MTW to be a very satisfying earphone. The selected tune is perfect for mobile use, good because that is likely where this product will see most of it's time. I would love micro detail to be a bit more prevalent through the mids. Good stuff in general though.

Final Thoughts:

At nearly 300 USD, the Momentum True Wireless are not a cheap, throwaway pair of wireless earphones. Do they sound like a 300 USD product? When compared to top performing wired earphones in that price range, no, not entirely. However, when you buy a wireless earphone, you're not buying just an earphone. You're also buying into the tech and features that make them sing. Reviewing any truly wireless product based on sound quality alone is of little value. That is just one small part of the overall picture and the overall picture with the MTW is one of competence and versatility.

The v-shaped tune Sennheiser went with works perfectly in the wild where there is noise and chaos, things that ruin bass and block out the mid-range. It's passive isolation is good enough to let you enjoy your music without too much interference. And when you need that interference to be a part of your life once again, such as when you're out jogging, you have that option thanks to 'Transparent Hearing'. I can't emphasize enough how well it works, and how useful it is. You don't need to to turn down your music, or roll with only one bud. You get the best of everything. It's a game changing feature in my world. Add to that the best wireless range, with obstacles, I've experienced to date and things are looking up.

That's not to say all is good and true in the world of the Momentum True Wireless. The battery life at 12 hours combined is overshadowed by, well, most modern products and could definitely benefit from an upgrade. The earpieces themselves are quite large and the ridge that runs around the bass of each hinders comfort slightly. I also worry about the long term durability of the cases' hinge, especially in cold weather. As I said before, plastic gets brittle in cold weather and brittle things tend to break. The touch controls also take a bit of getting used to, but work fairly well overall.

Those qualms aside, I love this product. As someone that spends most of their time listening to high value, budget friendly products from niche brands you have to buy through sometimes questionable sites, I'm always skeptical of mainstream brands and what they'll bring to the table. I was not expecting to enjoy the Momentum True Wireless as much as I have and while it could certainly be improved upon, what it does well it does really well.

If you're in the market for a premium, truly wireless product with some features that are both interesting and useful, the Momentum True Wireless is definitely worth checking out.

Thanks for reading!

- B9Scrambler

*If you enjoyed this review, visit The Contraptionist for more just like it.*

***** ***** ***** ***** *****

Some Test Tunes:

Aesop Rock – The Impossible Kid (Album)
Hail Mary Mallon – Are You Going to Eat That? (Album)
King Crimson – Lark’s Tongues in Aspic (Album)
King Crimson – Starless and Bible Black (Track)
Supertramp – Crime of the Century (Album)
Infected Mushroom – Legend of the Black Shawarma (Album)
Gorillaz – Plastic Beach (Album)
Massive Attack – Mezzanine (Album)
Fleetwood Mac – Rumors (Album)
Run the Jewels – Run the Jewels (Album)
The Prodigy – The Day is My Enemy (Album)
Tobacco – screw*d Up Friends (Album)
Felt – Felt 2 (A Tribute to Lisa Bonet) (Album)
Michael Jackson – Thriller (Album)
The Crystal Method – Grace (feat. LeAnn Rimes) (Track)
Jidenna – Long Live the Chief (Track)
Skrillex – Ragga Bomb (Track)
Big Grams – Run for Your Life (Track)
Funkadelic – Maggot Brain (Track)
Aesop Rock – Fishtales (Track)


  • Screenshot_2019-08-27-15-49-01.png
    266.2 KB · Views: 0
  • Screenshot_2019-08-27-16-46-56.png
    214.8 KB · Views: 0
  • Screenshot_2019-08-27-16-47-15.png
    108.3 KB · Views: 0
  • Screenshot_2019-08-27-16-49-58.png
    245.7 KB · Views: 0
  • Screenshot_2019-08-27-16-50-03.png
    829.5 KB · Views: 0
Last edited:
We can only thank @B9Scrambler for the super high-quality, informative review. We appreciate your honest opinions and are sharing them internally, but you also did a great job just describing the headphone. Very glad you like Transparent Hearing, it’s a feature also on a few of our products like the PXC550 and more in the future!
I see you've done another wireless review, great job! Keep those reviews coming! :) Is the Momentum much bassier than TWS600?
Just pick up an unopened box from someone's unwanted Christmas gift for AUD $120. Dirt cheap for a brand new item and sound great with my iPhone 11 Pro Max !


100+ Head-Fier
Pros: Balanced sound profile with even tonality. Aesthetically pleasing.
Cons: Bluetooth connectivity and touch controls still needs work. Lack of 3D stage depth.
Recently, I went on a quest to update my audio equipment to 2019 standards. My last purchase was my Astell & Kern T8ie MKII back in 2016 and so far I have been satisfied and still wowed by what it can do. There has been a lot of buzz about true wireless earphones (TWE) and how much Bluetooth technology and codecs have improved to the point where it is virtually indistinguishable to wired sound quality. Curious, I started my research two months back and I've read hundreds of threads, forums, reviews and tried as many earphone samples I could in nearby stores.

I received my pair of Momentum True Wireless (MTW) at an authorised Sennheiser store yesterday and so far the MTW has been great! My use case is as a walk-around IEM to work, on the subway, at the mall, at lunch/dinner. If and when the batteries run out or I'm sitting still at a desk, my A&K T8ie MK II are ready to take over. I am a fan of German headphones/IEMs sound tuning and previously used Beyerdynamic and Astell & Kern equipment.

This is meant to be a short comparison and not a full-hand-on-sit-down-with-10-headphones-10-DAC-AMPS review. I purchased it recently and went on a journey to find the best true wireless earphone in the market as of June 2019 and I'm here to share it with you.

Table of Contents:
MTW First Impressions
MTW Bluetooth
MTW Sound Quality
MTW Smart Control App
MTW Headphone Comparables
MTW Conclusions

Momentum True Wireless First Impressions
I gave it 4.5/5 and kept the last 0.5 because the Bluetooth connection and touch controls still needs work. I frequently need to restart pairing instead of the MTW automatically reconnecting to the phone after a charge.

Touch control for previous track (3 tap on left earbud) is not yet perfect. Instead it will go Next Track (2 taps) and Pause (1 tap). Super annoying. But these are teething issues to me and I can overlook them for now and instead choose the next track or restart pairing with my phone.

I only care about SQ and so far it has exceeded expectations. To be fair, I am not comparing it against $300 full sized headphones or wired IEMs. I think value wise, $150 is for the IEM SQ, $50 for the Sennheiser brand and $100 for the portability, Bluetooth technology, Smart Control app etc.

No problems with batteries thus far. 4 hours is about right. Case takes 1.5hrs to charge and all working as advertised. One thing I learnt is to carry a spare case and keep the IEM in the spare case if the battery is not yet <20% (or just keep it in your pocket if you don't mind some scratches). This way, you don't waste the charge in the Charging Case until you absolutely need to recharge the IEMs and you can get the advertised 12 hours battery life.

Trying to get a good fit can be challenging but the MTWs come with 4 pairs of earbuds (XS/S/M/L) and you should be able to get a decent fit. Otherwise, consider getting Comply foam tips to fit your ears. Oh, you also have to learn how to twist the MTW every time you wear it. This is something that I miss coming from my dear AKT8ie where FIT was one of the key selling points of the IEM. You could go the whole day wearing the IEM and not feel fatigue. With the MTW, it is bearable but it does get a bit painful after 4 hours of continuous listening.

Oh yes, you also get 2 years worldwide warranty from Sennheiser.

Momentum True Wireless Bluetooth
I am playing it on AptX codec on BT 4.2 and firmware version 1.25.00 via my S7Edge using Spotify or Foobar2K with FLAC. Volume is loud enough once the correct settings are picked. Note though that I prefer to listen on the louder side so I constantly max out the volume on the MTW. Best to test at a store if it's loud enough for your preference.

MTW supports SBC, AAC, AptX, AptX Low Latency. AFAIK, most phones don't have AptX-LL (see Qualcomm's website) so I wouldn't count on it much. Some complain about the lack of AptX HD or LDAC but AptX is plenty good enough for my portable needs. Maybe for the DSD/PCM folks, they need to consider something else.

You can watch movies/play games with these but it depends whether you can stand the slight lag. Using AptX, it seems the codec knows how to resync the video and audio for Youtube videos. For games however, it depends if your game has a bluetooth delay feature. I got my game to time perfectly with a 500ms delay although the AptX is reported to only have a 200ms delay. I suppose 300ms was for the game to render the graphics, but don't quote me on this.

Some people complain about drop outs here and there which they said is unacceptable. For me, as long as its infrequent (once or twice an hour) and is short (< 1 or 2 secs) and can be fixed with pressing play on the phone, I don't mind it too much.

Momentum True Wireless Sound Quality
For me, the MTW has a balanced sound profile with a small bass boost towards the mid and sub bass thus giving a slight U/V- sound signature. By no means is it a basshead IEM but it carries good mid-bass and good sub-bass rumble when called for. Bass quantity is just enough, without being muddy (Sony XB series) or being bass-shy (like ER4 series) while bass quantity it makes up in bass quality, with fast bass decay and good precision. However, if you like to be enveloped by world-class IEM bass like in the AKT8ieMKII or Xelentos, these still fall a bit short but it can be improved using the Smart Control EQ.

The mids are smooth and transitions well from the upper bass. Vocals are well represented. Female and male vocals sound natural with good realism without coming across as sibilant or shrill. It is important to note here that the midtones are smooth without discernible peaks which would lead to unnatural audio.

Treble extends well and you won't be disappointed with the detail revival, especially at lower volumes.

The background of the MTW is quite dark (not noisy) and thus there is good L/R stereo instrumental separation as what I'd expect for a closed back high-grade Sennheiser 7mm TWE IEM.

However, I do note that in terms of 3D staging, it is rather narrow, especially at high volumes, leading to a very intimate sound system rather than a laid-back sound. Most of the bass and sound seems to come within the skull and doesn't extend further outward unlike in the AKT8ie / IE800 / Katana / K10 / ER4 (disregard if you find the comparison not meaningful) or full sized headphones or stereo systems. This would be one of the few drawbacks for the MTW.

In general I agree with the frequency response chart and the MTW represents a balanced natural sound well with a rather intimate sound.

For reference, I'd consider the IE800 to be balanced with bass de-emphasis and treble emphasis (can be a bit piercing and sibilant sometimes). The Xelentos/AKT8ie to be balanced with bass emphasis (can be muddy sometimes) and slight treble roll-off. The Noble Katana's will get 10/10 for being balanced with excellent frequency response, detail revival and instrument separation albeit at twice the cost.

I typically listen to Korean pop, Spotify Global Top 50, some Ariana Grande, Lana Del Rey, and then some rock/heavy metal (Rammstein/Linkin Park/Metallica). MTW is versatile enough to do all these genres though with rock you can find it a bit claustrophobic. I believe for most people, they would find the MTW's SQ to be acceptable, if not excellent. Otherwise, you can tune it with the Smart Control App's EQ.

Momentum True Wireless Smart Control App
Interestingly, the MTW comes with a free app called Smart Control, developed by Sennheiser. In it, you can update the firmware over the air (OTA). The latest FW as of June is 1.25.00.

The app allows you several more options but I only cared for Transparent Hearing (which allows you listen to your surroundings using real-time audio recorded from the mic) and the EQ. The Smart Control EQ is aesthetically pleasing but a bit confusing to use at first. I've laid out what it means in general here.

Upper left quadrant: ++ bass - mids + treble (basshead preference but warning: it get's boxy/boomy!)
Lower left quadrant: -- bass + mids - treble (unnatural to me, sounds thin)
Upper right quadrant: + bass - mids ++ treble. (my preference for slight U/V signature)
Lower right quadrant: - bass + mids -- treble. (unnatural to me, sounds thin)

In general, I'd advice against moving more than 3 cm away from the the center (neutral/balanced/default) because it quickly gets out of hand and the frequency response deviates from balanced. Because of the slight U/V signature of the IEM, using the upper quadrants enhances its signature, while using the lower quadrants makes the sound signature too thin/flat/analytical for my preference. Of course, your mileage may vary but I prefer leaving the EQ at default or just 1cm 45 degree in the upper right quadrant.

For me, this EQ is worth a lot and is a unique selling point for the MTW as it allows different customers to personalise their MTW sound. I am not sure what happens behind the scenes but I like the flexibility it gives us and how much it truly affects the resulting sound from the MTW.

Momentum True Wireless Headphones Comparables
I think of true wireless headphones (TWE) SQ not as a direct comparable to wired headphones/IEMs because there's a lot of scale with wired IEMs (think IE800, Xelento, Noble Katana, etc.) Rather, can you accept 10% SQ loss for the portability, the hands-free, the lack of need to worry about DACs, AMPs, SPC/OCC/OFC cables, bla bla bla. If you can, then, TWEs are a good enough solution.

VS Bose SoundSport Free: SSF has a larger package and sticks out of the ear more. Granted, it has twice the battery life (5hrs +20hrs from case). SQ wise, since these are designed for sports, they are open-back and wouldn't be suitable for commutes or flights. Consequently, they have a wider, airier sound stage amid a softer bass response. Mids and treble are OK but nothing special. There is treble rolloff IIRC. My takeaway was that the sound was OK but not amazing. It was a form over SQ sort of design. No ANC though which is disappointing since Bose is well known for ANC. So I ruled it out as SQ was the main focus for me.

VS Sony 1000XM3: A bit unfair, I know, but at the same price point, I think the full sized XM3 is a fair competitor. First off, it has a whopping 30 hours of battery life which makes the MTW's battery life look like a joke. Then it comes with ANC and adaptive modes. It is also frequently on discount and is constantly being updated (3rd version now). But what bothers me is the SQ on the XM3. While many reviews shout about the SQ, I personally find the sound to be.. "boxy". What I mean is that the sound is not smooth. There is a clear bass segment and a clear mid segment but the trebles are strongly rolled off. And then there is a disconnect between the bass and mids segment. Even so, there is a strong mid/upper bass emphasis and little sub-bass rumble. Strong vocal tracks are distorted by strong uneven bass making it a disappointment for the discerning audiophile. Soundstaging is narrow and instruments sound claustrophic. Weirdly, the frequency response charts do not reflect what I hear. Be that as it may, the XM3 is aimed at the typical consumer requiring good battery life and portability, above average SQ and a reasonable price and that's the reason it is a successful Sony product. Still a good choice for those who don't mind bluetooth headphones.

VS Sony WF-1000x: A bit dated, but I tried this TWE for a while and it sounds great. It has the typical Sony bass-boost sound quality with rolled off treble. Sounds quite muddy in the bass/lower mids area. What it misses in sound, it makes for with ANC, a small package and half the price of the MTW. I would say skip this just because I suspect the Gen 2 is coming out soon as they have started going on a 20% sale in my location. Good for people looking for TWEs on a budget and who appreciates good ANC.

VS Sony WI-1000x: More recent than the WF-1000x, the WI's price range is comparable to the MTW; has 10 hours battery life and ANC. It really intrigued me and the sound quality was nearer to Hi-Res balanced. It boasts plenty of detail and has good sound staging and separation. There is a slight mid bass boost as expected but overall it sounds very pleasing. However, I ruled it out because I thought, for that price I might as well get a true wireless such as the MTW. See, I am lazy and prefer to keep the IEMs in a case instead of having a perma-neckband.

VS Sony WI-C600N: This is a Dec 2018 model and it actually was a solid contender at $120 and costs less than half the price of the MTW. It sounded more like the WF-1000x with a strong bass emphasis, shallow sound stage etc. Typical easy-to-like modern consumer sound. 1/2 price, 6 hrs battery life, flexible band etc made it a strong contender to the MTW but in the end I chose to go fully wireless instead of having a neckband. But worth a serious consideration for anyone frequenting gyms or planning to use these for a workout. Between these and the WI-1000x, which you choose depends on your budget and your sound signature preference. WI-1000x is overall technically a better headphone, but you have to pay double the price and you can't fold it and keep it in your jeans pocket.

VS XiaoMi Neckband: They retail for $80 and offer great value for those of us who can accept good enough SQ. It boasts 8hrs of battery life and has a flexible neckband. But I didn't care much for the SQ as the mids and vocals were quite harsh and treble was all over the place. For the price, I'd recommend saving up for the WI-C600N unless you're really on a tight budget.

VS Master & Dynamic MW07, RHA TrueConnect, Beoplay E8: Sorry, the stores in my location didn't allow me to try these.

Others have suggested to consider keeping my current IEM and use the Shanling M0 and ES100 as portable bluetooth DAC/AMPs but I personally dislike the idea because I might as well keep using my phone or a portable DAP. I don't see much of an upgrade in terms of portability which was the whole point of this quest anyway.

Alternatively, I also considered the Shure RMCE-BT2 and Sony MUC-M2BT1 wireless neckbands with MMCX connectors. The RMCE is reported to have excellent sound but I never saw it in any of the stores I've visited. However, I can personally vouch for the M2BT1. The M2BT1 with my AKT8ieMKII sounded phenomenal and to my ears, rivalled the wire. It has LDAC and AptX codec, features about 7hrs of battery life.

However, for the price of $185, you have to start wondering if getting a new set of TWE IEMs might be the better option. Just top up another $100 and you have another top-tier product from Sennheiser.

I only had a chance to test these few before the time I gave myself to decide ran out and I decided what the heck, let's get the MTW. Overall, from the few wireless options I've tried, the MTW indeed has the best sound quality and let's be honest, it's expected from Sennheiser. No dealbreakers that made me regret the purchase or wish I could return it.

Momentum True Wireless Conclusion

Great value for money if you care most about SQ and are looking for a premium SQ in a true wireless form factor. I bought it knowing Id have to be patient with the bluetooth/touch control issues and I wanted portability and a completely wireless package for an excellent sound, and that's exactly what I got with the Momentum True Wireless.

Ask me anything and I'll try to respond. Appreciate all the help from headfi, reddit and other reviews I've seen so far; thought I'd return the favor.

P.S. I asked the Sennheiser sales rep and he said there isn't going to be a product update (MTW 2.0) soon. Apparently MTW is Momentum 3.0 and people are waiting for the full line up to be released first. So MTW 2.0 will be Momentum 4.0 and I guess it will come in 2021.

P.S. Photos available upon request but I think others have covered it pretty well. You get a 2 earbuds, 1 charging case, 4 pairs of tips (XS, S, M, L) and a short (25cm?) USB-A to USB-C cable and 2 years Sennheiser international warranty.

2 Weeks Update:
So, a quick update:

1. You can't wear these to sleep. If you sleep on the right side, it goes "VOLUME MAX" on repeat. On the left side, the volume is decreased and it goes "VOLUME MIN" on repeat.

2. The bluetooth on these are questionable. Maybe it's my S7 Edge being a bit old, but when I am on the go, walking around the city or on the way to the commute, there is quite significant disruptions to the point it annoys me. Of course this problem is situational and you can't replicate it to a sales rep; so consider if you can accept this should it occur.

1. Despite that, the bluetooth pairing is instantaneous. The trick is to turn on BT on your phone before removing the right earpiece from the case. Or if you leave the BT permanently on, then that's better (but worse for your phone's battery life). Phone battery also doesn't seem to take a big hit. I also make it a habit to turn off the BT so that the MTWs go to sleep mode after 15 minutes. Otherwise they will wait up to 60 minutes before going to sleep. Otherwise, place both buds back into the case for trickle charging.

2. Loving the sound from these MTW bad boys more and more, using my preferred 1cm 45 degrees upper right quadrant on the internal EQ, I appreciate how the bass is present with excellent clarity and weight, while treble is crisper than the average IEM. It is no IE800, but plenty of treble detail to keep you satisfied that unless you do an A/B I won't miss the extra detail.

3. Battery has been a non-issue. Ran dead on the pair once after 4hrs of use as advertised. Never had the battery case dying on me, knock on wood. But my habit is to charge it every single night.

4. Good build quality. Dropped one earpiece when I was at the checkout, and my heart stopped. Luckily when I picked it up, there were no visible markings on the unit.

5. Volume has been very good. All my Spotify Extreme Quality songs, FLACs and 320kpbs MP3s have more than enough volume. This was a primary concern for me when purchasing the IEMs.

5.Overall, pretty happy with the purchase. They have dominated my music use on the go and I rarely miss my T8ieMKII since the SQ is about 80% although the sound stage is a bit compressed (it is left-right wide not front-back deep). The only time was during a 6 hr drive where I decided to go with a wired IEM.
They are cerainly way better than Jabra Elite Active 65t and Pantronics Bacbeat Fit and Backbeat Go I had previously as well as they are miles better than any generic bluetooth TWS being sold atm. I just believe they are tuned with a very consumer-frinedly approach in mind that won't suit anyone's taste. Good uplifiting listen for the gym but a bit of a.... ''BEATS'' quality sound for serious listening.
No worries, I can see your point that it is not balanced. But it depends on which side of the spectrum you are coming from. I consider the cheaper IEMS like the RHA MA650 or T20, or the Shure SE215 etc as bassy. I consider the ER4PT and IE800 to be treble oriented. So in the middle ground, there is the Xelentos, the Prophile 8, the Noble Katana, etc. To me, the MTW is among those IEMS.
But I would argue that you can make it "balanced" if that is your liking; just some tweaking with the internal EQ with the Smart Control app to reduce the bass (lower left or right quadrant) should clear things up. I personally prefer U/V shape sound so my setting has been the upper right (1cm away, 45 degrees).

I can see how you think the B&O E8 is balanced, but to me that is bass-shy / treble heavy. So it's a matter of preference and definition, IMO.



Well, Since I am big fan of the IE800, my favorite IEM so far, if those earbuds come close indeed i am definitely interested but not before someone from Sennheiser come here to tell us a battery life upgrade is coming :), hopefully before end of january


Member of the Trade: Selenium
I cannot recommend Sennheiser products enough. I currently own the HD1 FREE IEMs and I have put them up against MANY other brands and you would be hard pressed to find anything that can match let alone exceed then audio quality they provide. These will be my next pair.


New Head-Fier
MTW has an issue with using the optimum codec on both MacOS and IOS. On MacOS I have been unable to force AAC or AptX. Example issues : bass distortions on both YouTube and Apple Music on Hans Zimmer - Time at 30secs in on the right ear piece. Using Sennheiser IE800 via Apple dongle, AptX Bluetooth Astell & Keen XB10 AAC receiver and Chord Mojo there is no such distortion.

Test confirmation : MacOS with Astell & Kern XB10 and forcing standard Bluetooth SBC codec there is some distortion but not as pronounced.

MTW does not have AAC implemented with Apple products.

Perhaps an Android user could test confirm AptX and AAC functions.

Note there are lots of other pieces of music and movies I have evidenced with SBC distortion and I have returned my MTWs to JB HIFI in Sydney as it’s irritating and Sennheiser have not released a firmware update to correct this.

The issue may be coming from naitive Apple Music in AAC and being resampled to SBC. The distortion may not occur with RedBook to SBC or MP3 to SBC or OGG to SBC I have no means to test.

It should irk the consumer though if the MTWs are unable to utilise the optimum codecs, hopefully firmware update will be forth coming or recalls. There are a handful of reporters of the issue now, I have corresponded with Sennheiser myself but they have been slow to get back to me. Cheers Ashley


New Head-Fier
Well, Since I am big fan of the IE800, my favorite IEM so far, if those earbuds come close indeed i am definitely interested but not before someone from Sennheiser come here to tell us a battery life upgrade is coming :), hopefully before end of january


January has ended...and Shame, i never received an answer from Sennheiser about support for qualcom stereo mode that could double the battery life of the MTW.
I am going to pass on them and will wait for a new model or a major firmware upgrade anyway.

In the meantime, Sony WF-1000X are quite cheap on amazon (less than 80 dollars) and sound quite good.The thing that stopped me from buying an extra pair
is audio delay when watching videos...Else i could have switched and use them for a 10hours flight non stop.
Sad because i tested Sony on a train and found the cancellation very noise effective.
Ok, now i stop my Sony PR speech:)

I don't think the MTW are that good over the Sony considering the price.


New Head-Fier
MTW has an issue with using the optimum codec on both MacOS and IOS. On MacOS I have been unable to force AAC or AptX. Example issues : bass distortions on both YouTube and Apple Music on Hans Zimmer - Time at 30secs in on the right ear piece. Using Sennheiser IE800 via Apple dongle, AptX Bluetooth Astell & Keen XB10 AAC receiver and Chord Mojo there is no such distortion.

Test confirmation : MacOS with Astell & Kern XB10 and forcing standard Bluetooth SBC codec there is some distortion but not as pronounced.

MTW does not have AAC implemented with Apple products.

Perhaps an Android user could test confirm AptX and AAC functions.

Note there are lots of other pieces of music and movies I have evidenced with SBC distortion and I have returned my MTWs to JB HIFI in Sydney as it’s irritating and Sennheiser have not released a firmware update to correct this.

The issue may be coming from naitive Apple Music in AAC and being resampled to SBC. The distortion may not occur with RedBook to SBC or MP3 to SBC or OGG to SBC I have no means to test.

It should irk the consumer though if the MTWs are unable to utilise the optimum codecs, hopefully firmware update will be forth coming or recalls. There are a handful of reporters of the issue now, I have corresponded with Sennheiser myself but they have been slow to get back to me. Cheers Ashley
I don't follow your conclusion that AAC is not implemented because MTW distorts on a particular song. Sounds like a different issue if you were able to force AAC successfully. Perhaps it was just that pair.

You mentioned other reports of this. Do you have a link?


100+ Head-Fier
Just bought these yesterday after several listening tries at the shop. Really liked what Sennheiser did with the tuning of these IEMs. Certainly an improvement over the earlier BT Momentum’s. I thought it digs deep and manages to have a good soundstage. Volume is good compared to other BT sets I’ve tried. SQ wise, one of the best BT I’ve heard.

I’ve brought them to the gym - fantastic except slightly distracting when some of the music pieces I like are playing. They do catch one’s attention. Haven’t run with these yet. I’m aware they are only IPX4 rated so not sure how they deal with excessive sweat.


500+ Head-Fier
I know I'm reviving an old review, but I'm wondering if you have experienced these charging problems again? Have they had any fw update from Sennheiser ever since?


New Head-Fier
MTW has an issue with using the optimum codec on both MacOS and IOS. On MacOS I have been unable to force AAC or AptX. Example issues : bass distortions on both YouTube and Apple Music on Hans Zimmer - Time at 30secs in on the right ear piece. Using Sennheiser IE800 via Apple dongle, AptX Bluetooth Astell & Keen XB10 AAC receiver and Chord Mojo there is no such distortion.

Test confirmation : MacOS with Astell & Kern XB10 and forcing standard Bluetooth SBC codec there is some distortion but not as pronounced.

MTW does not have AAC implemented with Apple products.

Perhaps an Android user could test confirm AptX and AAC functions.

Note there are lots of other pieces of music and movies I have evidenced with SBC distortion and I have returned my MTWs to JB HIFI in Sydney as it’s irritating and Sennheiser have not released a firmware update to correct this.

The issue may be coming from naitive Apple Music in AAC and being resampled to SBC. The distortion may not occur with RedBook to SBC or MP3 to SBC or OGG to SBC I have no means to test.

It should irk the consumer though if the MTWs are unable to utilise the optimum codecs, hopefully firmware update will be forth coming or recalls. There are a handful of reporters of the issue now, I have corresponded with Sennheiser myself but they have been slow to get back to me. Cheers Ashley
Well, I got a pair today and have verified they are using AAC on both iOS and macOS. And they sound great.


Headphoneus Supremus
Well, I got a pair today and have verified they are using AAC on both iOS and macOS. And they sound great.

Thanks for that. I'm getting the original Sennheiser Momentum True Wireless earbuds to use with my iPhone 11 Pro Max and it's good to know it works with AAC.