Sounds good, but lacks some integral features

Sennheiser is best known for their premium in-ear headphones, which are generally admired by audio critics and users alike. The Sennheiser Momentum True Wireless won the Digit Zero 1 Award for Best Performing True Wireless Earphones in 2019, and the version 2 that the company launched this year also boasts solid sound quality. These headphones and earphones also come with impeccable build quality and design. The Sennheiser CX 150BT Wireless is a pair of mid-range wireless Bluetooth in-ear headphones priced at just under 5K. Let’s see if these earphones can impress us as thoroughly as Sennheiser’s more premium offers, over and over again.

Construction and comfort

sennheiser cx 150bt wireless bluetooth earphone

The Sennheiser CX 150BT is proud of the design accents and stylistic choices that are associated with Sennheiser products, but they are much smaller on this product. Earphones have a glossy-black finish on one side of the bud and on both sides of the plastic module (weighted box with battery). The other side of the plastic modules comes with a matte finish. These are the wireless in-ear headphones that can be worn in neckband-style, although they have lost the partial-hard, partial-flexible neckband that is typically found in wireless earphones.

sennheiser cx 150bt wireless bluetooth earphone

In this case the cables hang loose and the weight of the plastic modules often pulls the buds out of the ear from one side or the other. Oddly enough, one module is placed in such a way that it is fixed at the corner of your neck, the other sits in a more traditional position next to your neck. The unconventional placement makes the unit feel uncomfortable and unbalanced, which negatively affects the overall structure.

sennheiser cx 150bt wireless bluetooth earphone

Nevertheless, the materials used are still quite tough and strong. Plastic modules don’t seem cheap and uncomfortable, the three-button control system has touch and responsive buttons, and the earbuds themselves are lightweight and ergonomic, allowing users to wear them for hours on end without much comfort. The buds also produce a sufficient amount of seal, resulting in good passive isolation. Unfortunately though, the unit misses the Nifty magnetic modules that are commonly found in wireless neckband earphones. When not in use, earbuds simply hang loosely from your chest, which does not feel as secure as earbuds with a magnetic housing securely attached to each other.

sennheiser cx 150bt wireless bluetooth earphone

The company has provided 3 additional pairs of silicone eartip – XS, S, L (M size is already in the bud), which allows users to get as close to the perfect fit as possible. In the box, you will also find a Type-C charging cable. The Type-C port of the earphone is attached to the plastic module on the right under a plastic flap.

Overall, the earbuds are lightweight and ergonomic, however, due to the uneven placement of the modules, the buds feel unstable to the ear, and the lack of magnetic housing in the buds is also frustrating. The design is small and concise, however, we distort it by some of the build problems mentioned above.


The Sennheiser CX 150BT Wireless Earphones are not a feature-rich pair of wireless earphones and they miss some of the integral features expected in the 5K price range. Let’s start with the good. Powered by Bluetooth v5.0, the earphones have strong connectivity and good wireless range. We can go from one end of the apartment to the other without disconnecting from the source device, and the connection can go through one or two walls. There is support for AAC and SBC codecs, however, the earphones miss the APTX codec support that some wireless earphones have in this price range.

sennheiser cx 150bt wireless bluetooth earphone

The CX 150BT’s control system lets users control media and calls. The middle multi-function button, however, only feels extra work because it is used to perform pause, play, and tracking functions. When the music stops / plays once the button is pressed, a double-press will take you to the next track, while a triple-press will take you to the previous track. We personally dislike any triple-tapping commands here in the Digit Test Lab, as they inadvertently fail to register or perform the task assigned to the double-tap. The plus and minus buttons control the volume by a single tap. We’d prefer it if the track search controls were set here instead, allowing users to double-tap or long-press to get to the next and previous tracks. Also, there is no control for calling earphones voice assistant which is just unreasonable in 2020.

Earphones also have no shortage of IP ratings, so even if the earphones fit snugly in the ear, we would advise you to refrain from using them in the gym or jogging / running, as sweat can damage the earphones. Damaged In addition, earphones do not provide a favorable experience during intensive workouts or activities because the earbuds often protrude out of the ear due to the unbalanced placement of the plastic modules.

Oddly enough, earphones connect to Sennheiser’s Smart Control app, however, once you connect the buds to it, you can’t do anything with the app. You won’t even see the battery percentage of the earphones in the app.

sennheiser cx 150bt wireless bluetooth earphone

Earphones, of course, have a redeeming feature that has a remarkable battery life. The company tightened the battery life by 10 hours and in our tests, at 60-70 percent volume, we were able to extract more than 10 hours worth of juice! Even if you listen to good music for 3-5 hours a day, you can easily go 2-3 days in charge, which is impressive.


The Sennheiser CX 150BT plays an A-shaped sound profile that is brighter when reproducing the mids. In an A-shaped sound profile, the lows and highs are usually slightly pressed while the mids are slightly extended, as is the case with these earphones. It goes without saying that there is a severe lack of alkaloid response. It’s definitely got some punch and depth, not being overwhelming. However, if you’re a basshead, the bus response may seem a bit inadequate for your tastes.

Now, in the middle, the Sennheiser CX 150BT is really flying here. Vocals, especially men, tend to be quite clear and fluent. Female vocals may sound slightly trivial at high volume, but it is not too annoying. As in the song Pull me down By Dream Theater And Selkis By BTBAMThe vocals and lead instruments sound fine, almost as good as the more expensive Sennheiser Momentum True Wireless 2. However, the bass guitar and drums on both of these tracks sound dull and energetic.

sennheiser cx 150bt wireless earphones

Earphones seem to be more suitable for vocal-centric tracks and pop songs than rock and EDM. Still, they are not disappointed with the genre. Overall, these are a good sounding earphone below 5K and most users will be more than happy with the sound quality (except for base lovers, maybe).

Coming to the quality of the microphone, we were fascinated by Mike’s comprehension. We tried to write a paragraph in the Note app via voice and the app was able to pick up most of the words accurately. For calls, the microphone also works quite well. The voice is clear and there is no closing or distant sound near the receiver.

The last row

The Sennheiser CX 150BT is a great pair of wireless earphones under 5K that have been damaged due to the absence of some integral features and some build errors. If you don’t mind the absence of voice assistant support and an IP rating, and if you think the design is good enough for you, there aren’t many wireless earphones in this price range that sound as good as the Sennheiser CX. 150BT. However, if you are a basshead, you need to look elsewhere to meet your bus needs.

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