Let's get the obvious out of the way: these buds are larger than you expect, and heavier, in part due to the 7mm driver (same as the more expensive Momentum line from Sennheiser)... but you won't care about the size or weight, because they just sound so, so incredible.
That 7mm driver does make amazing sound, better than any wireless earbud I've tried, and for around $100 at the time of my purchase, this has better "quality sound / dollar" than anything I've tried.
But there are some odd design decisions. The touch surface for the control on the outside of the big block is hypersensitive (even a quick touch from my hand can trigger a pause, much more sensitive than, say, Airpods Pro). On the good side, you can control volume from these, but it's a bit tricky due to the sensitivity. For all the audio quality, I found I had to set the volume higher with these than with other earbuds on both iPhone and Windows PC Bluetooth (in Windows, go to Sound in the Control Panel (under "Hardware and Sound"), highlight your headphones, click Properties, and select the Enhancements tab. Check "Loudness Equalization" and hit Apply to turn this on, helps a ton). With the plugs in, your do get good isolation from the outside (so "passive" noise reduction), though of course, you now hear every breath and gurgle from inside your body, as you do with any sealed-ear device. Even with a Bluetooth 5.0 connection (they support up to 5.1) on the PC, BT lag is still present; this is really evident watching videos and, to some extent, on video conferences. The buds stick out from your head, and are heavy, so extended wearing became ear-canal sore, but never really painful. The ear tips are silicone, but less flexible than from other vendors: I usually wear a medium in other earbuds, but it feels a touch large for my ears; the small felt too small. I may invest in Comply Foam for the first time.
The buds support SBC, AAC and aptX, which is nice for iOS or Android users. Microphone quality is the usual: it's good enough, but not as good as Airpods Pro, and clearly not the primary focus of the buds. It'll be ok, but expect to have to repeat sometimes, as with almost every wireless earbud out there. Also, I missed the auto-shutoff from so many of the other modern earbuds; these just keep playing when you take them out (luckily, due to the hypersensitive touch panels, I accidentally pause when taking them out most times!).
Also, an odd design choice means that the "power pads" where the buds connect to the terminals in the case is just rear of the earplug; this puts a ridged surface directly touching one of the folds of the ear. If you push the earpiece all the way in, you are putting the one rough surface directly against your ear. Sennheiser could have easily put this on, say, the rear-facing portion of the block and let smooth plastic touch the ear, but, well, they didn't. You'll get used to it, but it's just an unnecessary design choice.
Connection is quick with verbal feedback in the buds. Battery life is as expected, and runs easily the 6 or so hours; the case can give another 12-13. It takes longer than an Airpod Pro to recharge; it's worth charging over a longer break than just the few minutes other products can charge in. The case has a USB-C plug, but the included cable is tiny; throw a normal length one in your cart when you buy this. The case has no wireless charging ability, oh well. The case is larger than expected, a little heavier than an Airpods Pro case, and due to it's rectangular shape and width, a bit pocket un-friendly. The top does have a hinge-helper which holds the top open, something more cases should try.
Sennheiser has an app for iOS and Android, and it really is necessary. It allows a firmware update to 2.13.0 that substantially improved connection speed. You can customize almost all the tap patterns; I added "play pause" to the right ear instead of just on the left. It also lets you store different EQ profiles (just 3 bands, so a bit gross, but better than nothing; there's also a "touch and slide" interface but it's really just a layer on the 3 band). The profiles are stored in the bud, and can be changed live via the app, even if you are listening to another source (so, using the phone to adjust the eq while listening to the computer). The app lets you control the connections as well; like most BT devices, you can't connect to more than 1 source hot at a time (aka no multipoint), and switching is still manual (Apple's Airpods ecosystem is more automatic, and Bose has done a nice job of having 2 sources mounted at once and having easy swapping between them).
These are not sport buds: they don't quite stay in all that well (in my ears) when moving and have 0 water/sweat protection beyond the usual (a bit will probably be fine, but during a heavy workout, these re not fully protected from salty sweat.)
So, other than odd choices in where to put the power connectors, the large size of the main block, the sensitivity of the touch panel, and oddities of the eartips size, the sound quality is amazing, far better than I expected from a Bluetooth connection, esp. for the price. Master and Dynamic has a similar pair that drop in price to around $100, and Yamaha has a nice pair around this price with similar specs, but after trying them all, I'm willing to put up with the odd design choices for that clean Sennheiser sound.
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From the manufacturer
Better sound. Better control.
Whether you’re in the mood for calming tunes or crave some thrilling beats, the bespoke drivers of the CX 400BT True Wireless deliver high-fidelity sound with deep bass, natural mids and a clear treble. Plus, you can personalize your listening experience with the Smart Control App, which lets you play with built-in equalizers for an even more amazing sound quality.
Tune in. Switch off.
For those who always like to be on the ball, on the beat and on-call, the customizable touch controls on both earbuds make it easy to enjoy a smarter and more connected lifestyle. The touch-sensitive interfaces provide fast access to voice assistants such as Siri and Google Assistant, as well as intuitive control of your music and calls.
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Premium sound. Any device.No matter where you stand – iOS or Android – you’ll always get to enjoy the CX 400BT True Wireless earbuds. Thanks to our wide range of audio codec support including SBC, AAC and aptX, premium sound is guaranteed and with any mobile device. |
Anytime. All the time.Never miss a beat throughout the day with 20 hours of battery life, 7 hours on a single charge and a further 13 hours with the small, sleek and compact charging case. The CX 400BT True Wireless earbuds are designed to ensure you get premium sound wherever you go. |
Minimalist Design. Stylish comfort.The CX 400BT True Wireless is made for those who enjoy diving into a long playlist, a lively audiobook or a loving phone call. Available in black and white, they have an ergonomic design created for all-day comfortable wearing. The earbuds achieve a perfect fit in the ear for excellent passive noise cancellation and keep the earbuds securely in place, thanks to adapters provided in a choice of four sizes. |
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| CX 400BT True Wireless | MOMENTUM True Wireless 2 | |
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| Customer Reviews |
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5,348
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| Price | — | $188.79 |
| Color variants | Black & White | Black & White |
| Battery life | 7h + 13h (earbud + charging case) | 7h + 21h (earbud + charging case) |
| Customizable controls | ✓ | ✓ |
| Call function | ✓ | ✓ |
| Active Noise Cancellation | ✓ | |
| Voice assistant access | ✓ | ✓ |
| Internal EQ / Custom presets | ✓ | ✓ |
| Transparent hearing | ✓ | |
| Smart pause | ✓ | |
| Splash Resistant (IPX4) | ✓ |
Compare with similar items
This Item  Sennheiser Consumer Audio CX 400BT True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls - with Noise Cancellation and Customizable Touch Controls, White |  |  |  |  |  | |
| Price | -25% $149.95 List: $199.95 | -28% $129.00 List: $179.95 | $118.00 | $120.56 | -45% $125.79 List: $227.99 | $79.99 |
| Delivery | Get it as soon as Tuesday, May 14 | Get it as soon as Tuesday, May 14 | Get it as soon as Tuesday, May 14 | Get it as soon as Tuesday, May 14 | Get it as soon as Thursday, May 16 | Get it as soon as Tuesday, May 14 |
| Customer Ratings | ||||||
| Sound quality | ||||||
| Battery life | ||||||
| Noise cancellation | ||||||
| Sold By | Amazon.com | Amazon.com | Amazon.com | Amazon Warehouse | Amazon.com | EarFun US |
| connectivity tech | Bluetooth | Bluetooth | Wireless | Wireless | Bluetooth | Wireless |
| headphones form factor | In Ear | In Ear | In Ear | In Ear | In Ear | In Ear |
| connector type | wireless | wireless | wireless | wireless | wireless | — |
| noise control | sound isolation | active noise cancellation | active noise cancellation | active noise cancellation | active noise cancellation | active noise cancellation |
| cable feature | Without Cable | Without Cable | Without Cable | Without Cable | Without Cable | Retractable |
| control type | Voice Control | Touch Control | Media Control | Voice Control | Voice Control | Touch Control |
| water resistance | not water resistant | water resistant | water resistant | water resistant | water resistant | waterproof |
| material | Silicone | Plastic | Plastic | — | Plastic | Composite |
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Real Life REVIEW of Sennheiser CX400BT earbuds
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Sennheiser Momentum 2 TW Vs Sennheiser CX 400BT
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Sennheiser CX Review & Compared To Momentum TW 2
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Sennheiser CX 400BT Full Review True Wireless Earbuds
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Reviews with images
Sennheiser disappoints me for the first time
First let me start off by saying that I bought these buds on a sale for $99 and even that seems too high for theseQuality: the build quality is great they feel like $200 earbuds no problems thereSound: To be totally honest they don’t sound that bad, they do not get very loud at all I have my phone all the way up and sounds like it’s half way. This makes it hard for me to justify the price if I can hear myself speak on full blast and others as well.App/Software: Sennheiser seems to nearly miss in this category every time for me but makes it up with the way their products sound naturally, However I downloaded the software app to change equalizers and it’s almost as if it doesn’t work at all I mess with it and somehow the buds just start sounding like $30 earbuds quite sad really.Battery life: Alright this is where Sennheiser takes the cake they have awesome battery life almost letting me forget they are even wireless.Comfort: These fit quite well and they are good for short periods of time, after awhile though they get to be a bit annoying but pretty solid work thereConclusion: These are absolutely not worth that $199 price tag they have got way too many issues and they just don’t sound all that impressive I’d just get AirPods or something else at this point I will probably not be using these daily because they are just a problem.
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T
A honest detailed experienced perspective review for helping selectors.
Reviewed in Canada on February 14, 2021Color: BlackVerified Purchase
Cliente de Amazon
Gran sonido, claridad, y comodidad.
Reviewed in Mexico on December 29, 2020Color: BlackVerified Purchase
Cliente de Amazon
Reviewed in Mexico on December 29, 2020
El diseño es minimalista y son discretos, a pesar de su tamaño, que no son los más pequeños del mercado. El estuche de carga es de un tamaño muy cómodo para llevar en el bolsillo del pantalón.
Los cuatro puntos que me encantan de estos Audífonos son:
La comodidad, la duración de la batería, la conexión sólida con el smartphone, y por supuesto, el sonido.
Son bastante cómodos, casi no pesan, y te aíslan pasivamente del ruido exterior a pesar de no tener cancelación de ruido activa.
La batería le dura hasta 7 horas sin interrupción sin tener que recargarlos en el estuche de carga.
La conexión con el smartphone es super sólida. No he tenido ninguna desconexión o dropout durante la reproducción, aún si te alejas a más de 10 metros.
El sonido es muy claro, escuchas detalles de los instrumentos que no se escuchan en otros audífonos. La tridimensionalidad del sonido, es decir, el espacio y separación de los instrumentos es impresionante para unos audífonos de este tamaño. Es lo más parecido a unos audífonos de diadema. Se disfrutan mucho viendo películas. Las frecuencias agudas, medias, y graves están presentes cuando los sacas de la caja, solo tienes que descargar la aplicación para personalizar el ecualizador a tu gusto y el preset se guardara en los audífonos. Los agudos son brillantes, los medios muy notables y los graves, créeme, no te decepcionarán, son super claros y profundos.
No te los recomiendo para hacer deporte porque no tienen certificación contra agua. Si los quieres para este tipo de actividad ve por los Sony WF-XB700 (Que son los que yo uso para esto) o por los Sennheiser Momentum del modelo mas reciente, claro que a un precio más elevado.
Se pueden emparejar hasta a 8 dispositivos. Solo tienes que abrir la configuración del Bluetooth, seleccionarlos de la lista, y se desconectaran automáticamente del dispositivo anterior.
En las llamadas, el micrófono no es notable, pero es lo suficientemente bueno para realizar llamadas con el teléfono y te escucharán claramente.
La aplicación agrega algunos extras como la personalización del sonido, los controles táctiles y las actualizaciones de firmware de los audífonos, que por cierto, tarda un montón.
En resumen, si buscas como yo unos audífonos para escuchar música o películas sin perder todos los detalles con una gran sonido 3D, estos audífonos son para ti.
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Jendricio
Solides Headset mit Top Sound
Reviewed in Germany on February 11, 2021Color: BlackVerified Purchase
