Reviews // Headphones

Sennheiser CX 400BT Review • Superior sound quality from Sennheiser

Sennheiser CX 400BT

Although there are external differences, the Sennheiser CX 400BT wireless headphones are a the less expensive version of the Sennheiser Momentum True Wireless 2. The new model costs $ 150, and the key difference is that the CX 400BT does not have active noise cancellation.

Sennheiser CX 400BT review

However, the sound quality and touch controls are also excellent here. Quite possibly, these are the best wireless headphones in the price segment under $200. They are not the most suitable for training, but the sound of the CX 400BT is incredible.

Design and appearance

Sennheiser CX 400BT are very compact headphones. They don’t have an oblong case like the AirPods Pro or earhooks like many sports models. Nevertheless, the attachments sit in the ears quite reliably. There is no IP protection here, so I advise you to use them carefully in the rain. There are four additional pairs of silicone ear tips included, which is sufficient for all types of ears.

Sennheiser CX 400BT

The left and right Sennheiser CX 400BT headphones have touch-sensitive control panels. Pressing the left panel is responsible for play and pause, while the right panel is responsible for calling the voice assistant or answering a call. Double-clicking on the left – turns on the previous track, on the right – the next, or ends the call. Long press and hold on either side – adjusts the volume.

Also read: Soundcore Liberty 2 Pro Review • Excellent sound and battery life

The CX 400BT touchpads are responsive and easy to use. There are all the functions you need: control playback, answer calls, call an assistant or change the volume. It seems that this should be the norm for modern wireless headphones, but, for some reason, many manufacturers are not finalizing the controls.

Sennheiser CX 400BT convenience

However, Sennheiser did a good job here. What’s more, in the Sennheiser Smart Control app for iOS and Android, you can customize your taps to your liking. It is even possible to add triple actions. The control implementation in the CX 400BT is, in my opinion, one of the best wireless headphones to date.

Sound quality

The Sennheiser CX 400BT has 7mm dynamic transducers covering a frequency range of 5 Hz – 21 kHz. These are the same drivers used in the Momentum True Wireless 2, so the sound quality of the two models is similar.

The CX 400BT headphones are Bluetooth 5.1 compliant and support AAC, aptX and SBC codecs. They are capable of delivering powerful low frequencies. There is no distortion at high volumes, and even at medium levels, the bass sounds impressive. The sound is very voluminous and much better quality than almost all competitors, where the sound is flatter.

Orchestral music plays best. It seems that the CX 400BT was made just for it. The headset provides excellent balance across the entire frequency range. The low and high frequencies are slightly boosted, although the sound never becomes unnatural.


Sennheiser’s CX 400BT battery life is average. According to the company itself, one headphone charge is enough for 7 hours of operation, when the case gives an additional 13 hours. Of course, these figures also depend on the set volume level. The microphones are of high quality.

Sometimes the Bluetooth connection introduces its own distortion, but this happens with all wireless headphones. When you take notes, your voice will sound clear and intelligible, and the same goes for phone calls.

Sennheiser CX 400BT review

Sennheiser CX 400BT lacks active noise cancellation, but at this price you get superb sound, easy controls, and an app with an equalizer
The good:
  • Fits perfectly in the ear
  • Superior sound quality
  • The app has a handy equalizer
  • Comprehensive, intuitive controls
The not so good:
  • No water protection
Sennheiser CX 400BT


Despite the presence of such competitors as the Apple AirPods Pro and Bose QuietComfort Earbuds, the new CX 400BT has almost the same sound as the Momentum True Wireless 2, at a much lower price.

Although the Sennheiser CX 400BT doesn’t have active noise cancellation, at this price you get superb sound, easy controls, and an app with an equalizer. Perhaps these are the best wireless headphones right now.