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Sennheiser CX 400BT review: wireless premium

Sennheiser CX 400BT reviews from experts 27 / May / 21 Homer Barton Visitors: 1534 Rating:

Today we will tell you about the Sennheiser CX 400BT TWS headphones. This brand has long been familiar to fans of personal audio equipment. And the novelty, which came to our review, is interesting not only for its features, but also for the quality of sound reproduction. It's time to examine the gadget in detail.

Sennheiser CX 400BT review

Design with character

The Sennheiser CX 400BT comes in a compact case with a secure locking lid. Not looking back at trends, the manufacturer has made the headphones as 'earplugs' with rounded corners of the housing. Two versions are available - white and black.

The housing looks a little bulky, but in fact each earpiece weighs 6 grams and almost instantly stops feeling in your ear, from which it barely protrudes. The in-canal arrangement gives a secure fit, and for added convenience four interchangeable earpieces are traditionally included. A comfortable fit and passive noise cancellation will benefit from the custom fit.

The controls are fully touch-sensitive and operate with a slight delay. One, two and three-press commands are available, you just have to practise hitting the touch pad precisely. At the same time, there are no problems with its accuracy - even if the user is wearing touch gloves, everything functions correctly.

Sennheiser CX 400BT Overview

Pairing and application

The commands are set up after pairing the headphones to the Sennheiser Smart Control app, available for both Android and iOS. You can change the commands at will, disabling unnecessary ones - triple tapping, for example. For those who don't like touch controls and prefer to control everything from their smartphone or fitness tracker, the option to disable them is available.

The app also allows you to customise the nature of headphone notifications, update the software and reset to factory settings. If you're too lazy to dig in, you can use the gadget without the software. By the way, the screenshots below just show the default control settings.

Sennheiser CX 400BT review

They sound decent

The Sennheiser CX 400BT features dynamic 7mm drivers similar to those found in the more expensive MOMENTUM True Wireless 2. Combined with support for the aptX codec, this results in a very pleasant sound, full, rich and detailed. Whichever genre you listen to, you hear all the nuances and parts, revealing details that are simply not noticeable in cheaper headphones. The model was tested in rock, EDM and hip-hop - everywhere the sound is consistently good.

It's great that you can adjust the equalizer, but judging by the feel there is no need to change the default settings. A decent volume margin is palpable even when using the headphones on public transport. As already mentioned, passive noise reduction is achieved by the in-channel format, but active noise reduction is unfortunately not available here. It certainly wouldn't be superfluous.

When talking on the phone through headphones interlocutors do not notice any difference with the communication through the regular speaker. Which is indicative, because usually TWS immediately superimpose noise or echo on the sound of the voice.

Sennheiser CX 400BT review

What about autonomy?

The Sennheiser CX 400BT honestly runs the claimed 7 hours on a single charge. The case allows you to extend the total run time up to 20 hours, that is to fully charge the headphones almost twice. Recharge time for both the headphones and the case is around 90 minutes.

There is a fast charging option - in 15 minutes it gives 1 hour of playback time. This function is useful for those who, shortly before going to work, remember that the headphones are empty and don't want to go without music in transport.


The Sennheiser CX 400BT self-contained wireless headphones have the sound quality of the more expensive model, they are easy to operate and generally use. ANC is not provided, but you can adjust the equalizer using the proprietary app. Battery life is not record-breaking, but it's on par with most TWS devices. If the AirPods design doesn't appeal to you and you want cool sound, it's worth checking out.

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