Sennheiser CX True Wireless
RRP $ 130.00
"They offer the best sound you can find in an affordable set of earbuds."
advantages
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Excellent sound quality
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Customizable EQ
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Precise and customizable controls
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Sidetone for telephone calls
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Good battery life
disadvantage
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No in-ear sensors
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No transparency mode
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Could be difficult to get a secure fit
True wireless earbuds have always been a dilemma. Unlike their wired cousins, wireless earbuds require a variety of components such as batteries, charging cases, bluetooth radios, amplifiers, etc. All of these drive up costs and make it difficult to deliver high quality sound at affordable prices. Sennheiser – a brand with an enviable reputation for great sound – is experimenting with the line between quality and affordability.
Its first recording was the $ 200 CX 400BT it launched in 2020, a set of true wireless earbuds that did deliver sound but missed a lot of the features we'd expect at this price point. Sennheiser's second act is the $ 130 CX True Wireless. Are these buds achieving that magical balance between price and performance? We put them to the test to find out.
What's in the box?
Simon Cohen / Digital Trends
Sennheiser is one of a growing list of companies that have made their packaging highly recyclable. The box of the CX True Wireless consists of plain printed cardboard and even the small packaging that protects the included earplugs is paper-based. You won't find a hint of plastic or foam anywhere. Inside you will find the earphones, their charging case, earbuds in four sizes, a short USB-A to USB-C charging cable and some paper documentation.
design
Sennheiser CX 400BT (left) and CX True Wireless Simon Cohen / Digital Trends
Visually, the CX True Wireless can hardly be distinguished from the CX 400BT. Both the charging case and the earphones have identical proportions. On closer inspection, there are small differences: the CX True Wireless have a more subtle branding that some will no doubt prefer, and their charging case has removed the dedicated pairing button from the case of the CX 400BT. The touch controls now use a matte plastic surface instead of a glossy surface.
If you pull one off this review, here it is: The CX True Wireless are a sound bargain.
The earbuds stay a bit bulky and won't win any awards for style. But the rounded box shape makes it easier than many other earbuds to insert into your ears without accidentally triggering a control path – it also makes it easy to remove and reinsert in their charging case.
One thing that has changed from the CX 400BT is the addition of an IPX4 rating for water resistance. This means that the CX True Wireless is on par with other earphones such as the AirPods Pro. They won't survive a swim in the pool, but now you can at least take them to the gym, on the track, or wherever you sweat without worrying about your earplugs.
Comfort, controls and connections
Unfortunately, since the CX True Wireless inherited its size and shape from the CX 400BT, they also inherited the fit of these earbuds, meaning they may not be comfortable. In order to get a really comfortable and secure fit, I have set myself a set Comply foam earplugs – the same ones I ended up using on the CX 400BT to deal with the same situation.
Sennheiser is still one of the few companies that really understands what is important when it comes to touch control.
To be fair, the silicone earbuds that Sennheiser included with the CX True Wireless are likely to work for a lot of people and I would never say they are uncomfortable. But they definitely don't fit as securely as foam, nor do they seal your ear canals as effectively. If you run into the same thing, just buy some comply tips from Amazon for a few dollars – you'll thank me for that.
The touch controls on the CX are excellent. Sennheiser is still one of the few companies that really understands what is important when it comes to touch control. The control surfaces are large and clear – it's effortless to get consistently accurate taps. As a bonus, a subtle tone confirms that you typed correctly.
You can adjust these controls with the Sennheiser Smart Control app. Single, double and triple taps can all be assigned to the function you want, and you can choose a different function for each earbud – handy when you want to use the earbuds independently (which you can do for both music and calls). You get everything you need: play / pause, skip tracks forwards / backwards, trigger your voice assistant and increase / decrease the volume. The only feature that can't be changed is the volume, which the long tap gesture requires when you want to use it.
Pairing with iPhones or Android devices is easy, even if the CX doesn't come with Google's Fast Pair – a few taps and you're done. If you're on an iPhone, you're limited to the good but lossy AAC codec, while Android users can enjoy the slightly higher quality aptX codec. But regardless of your source device, you can't hike very far. The CX has one of the shortest wireless signals I've ever tested – they started to dissipate when I placed just 6 meters between me and my phone. If you have your phone with you, this shouldn't be a problem. But if you want to leave your phone in a pocket or locker, be ready to stay around.
Sound quality
Simon Cohen / Digital Trends
With the included silicone earbuds, I found the CX True Wireless a bit anemic for the bass, but that was a purely fit function. After I swapped them for the foam tips, the sound improved dramatically. If you pull one off this review, here it is: The CX True Wireless are a sound bargain. They deliver impressively detailed and precise performance that comes incredibly close to earbuds from Sony, Bose, JBL, and Master & Dynamic, which can cost anywhere from $ 250 to $ 350.
The soundstage is wide and deep, and purists will like that Sennheiser's factory EQ settings give you a flat / neutral signature. But I usually find neutral EQ sounds boring at my preferred volume levels, so I love that the Smart Control app gives you two ways to visualize and change the emphasis of lows, mids, and highs, and create presets when You can find a setting that you like. You can clearly energize the lows and highs without losing details in the mids.
I've spent quite a bit of time switching from one genre to another, and whether it was jazz, pop, metal or hip-hop, the CX True Wireless did them wonderfully. If you've never really listened to decent earbuds, the CX will also bring you one of my favorite experiences: hearing a detail on one of your favorite tracks that you've never heard before, or rendering it to make a smile on your face.
When conditions are relatively calm, your voice will be nice and clear, with very little compression or wobble.
One track that certainly did this for me is Melanie Martinez ’High School Sweethearts. After a minute, Martinez goes from her breathy and F-bomb-laden intro to the main part of the track, and at this point you can hear someone writing on a blackboard. The CX places this unmistakable scratchy sound behind Martinez's voice so precisely, as if you could look over her shoulder and see the person writing. It gave me goosebumps.
Battery life
Simon Cohen / Digital Trends
The CX 400BT promised seven hours of battery life per charge, with a total of 20 hours including the charging case – acceptable, but hardly worth mentioning, especially for earphones without Active Noise Canceling (ANC). But the CX True Wireless are a step up, with nine hours on a full charge and a total of 27 hours on the case.
With a quick charge of 15 minutes you get an extra hour of playtime. This puts the CX True Wireless on par with some of the best earbuds in terms of endurance – a welcome improvement.
Call quality
Making calls with the CX True Wireless is about average for True Wireless earbuds. When the outside conditions are relatively calm and there is no wind, your voice will be nice and clear, with very little compression or wobble. This must be the “voice-optimized sound” that Sennheiser refers to in its description of the earphones.
However, this does not apply to times when wind or loud noises are nearby. At these times, the microphones struggle to keep your voice consistently clear. Since so few earbuds do this excellently, I can hardly blame Sennheiser for anything, but remember: These are earbuds for making phone calls at the desk or when waiting for the flight – not for jogging, cycling or walking near heavy traffic.
These were also my observations when testing the CX 400BT, but here the CX True Wireless improves its more expensive predecessor once again: The CX True Wireless has an adjustable sidetone, which means that you can hear your own voice much more clearly when making calls. It works really well, but I found it difficult to adjust the amount of sidetone during a call.
Something missing?
The CX True Wireless really hit a sweet spot in terms of price and sound performance, and even managed to deliver really good battery life, but there are still some features you may be missing. There is no listening mode (transparency), which is surprising given the eavesdropping feature – these two often go hand in hand.
There are no in-ear sensors that can automatically pause your music when you pull out an earbud. Given the lack of transparency mode, this is what you will often do when you want to talk to someone in real life.
The charging case lacks wireless charging – maybe a minor annoyance, but it's becoming standard on many earbuds that cost less than the CX.
ANC does not exist either, but that is a feature that Sennheiser will do without at this price.
Our opinion
For people who love high-end sound quality but don't have the money to indulge in the best of true wireless earbuds, the CX True Wireless are a great buy. As long as you can forego a few features like the transparency mode and are willing to buy third-party earbuds if the sound or fit doesn't work for you, I think you'll be really happy.
Is there a better alternative?
There are tons of great True Wireless earbuds available anywhere between $ 100 and $ 130 that can outperform the CX True Wireless in terms of features. The Second generation Amazon Echo Buds come to mind as well as that Soundcore Life P3, and the Jabra Elite 75t. But none of these can beat the CX in terms of sheer sound quality.
Ironically, Sennheiser now apparently has that CX 400BT to just $ 100 – it just might be the best alternative. Same great sound, but with a shorter battery life, no water protection and no audible tone for calls. If you're willing to give these up for a $ 30 savings, you're cheating!
How long will they last?
While hard to predict, the CX True Wireless looks better than many other True Wireless earbuds. The fit and workmanship are excellent and Sennheiser supports them with a two-year guarantee, which speaks volumes for the company's confidence in its product. The industry standard is only one year. With IPX4 protection and a good starter battery capacity, they should last you for years to come.
Should you buy it?
Yes sir. The CX True Wireless solves the problem of getting great sound on a budget.
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