Connect with us

Hi, what are you looking for?

New Products

Sennheiser Announces CX 400BT True Wireless Earbuds

$199 True Wireless earbuds with a bespoke acoustic system featuring customizable touch controls, all-day comfort and 7 hours of battery life.

Sennheiser CX 400BT True Wireless White Earbuds on Woman

Superior Sound with Built-in EQ

Sennheiser today introduced the new CX 400BT True Wireless earbuds. Priced at $199, they feature intuitive touch controls, all-day comfort and a 7-hour battery that can be extended to up to 20 hours using the supplied charging case. Plus, its built-in equalizers lets listeners adjust sound quality to their personal taste.

Sennheiser CX 400BT True Wireless White Earbuds in Charging Case

The CX 400BT True Wireless claim astonishing performance thanks to Sennheiser’s 7mm dynamic drivers which are also featured in the acclaimed MOMENTUM True Wireless 2 earphones that were introduced earlier this year. Developed for audio enthusiasts, this bespoke acoustic system delivers high-fidelity stereo sound with deep bass, natural mids and clear, detailed treble. With the Sennheiser Smart Control app it is also possible to tailor the sound experience to one’s personal preference via the built-in equalizer. Support for codecs such as SBC, AAC and aptX assures exceptional sound quality with both iOS and Android mobile devices.

Sennheiser CX 400BT True Wireless Black Earbuds

The CX 400BT True Wireless earbuds have customizable touch controls that let the user define their preferred way of controlling audio, calls or accessing voice assistants such as Google Assistant or Siri. For phone calls and when using smart assistants, the earbuds feature ambient noise reduction microphones to make voice interactions sound natural and crystal clear. With the CX 400BT True Wireless, device connectivity is fuss-free, thanks to Bluetooth 5.1 compatibility for reliable connectivity and easy management via the Smart Control app. Also, the earbuds support Bluetooth Multipoint, which enables them to connect to up to eight different Bluetooth devices.

The CX 400BT True Wireless provides 7 hours battery life on a single charge, and up to 20 hours per day when re-charging via the supplied case. Plus a quick ten minute charge returns an extra hour of usage. For comfort and fit, Sennheiser includes four different sized ear tip adapters.

Product Video


  • 7mm dynamic driver & built-in equalizer
  • 7 hour battery life per full charge (20 hours total) 
  • Charging time:
    • 1.5 hr for full charge
    • 10 min for 1 hr playtime
  • Customizable touch controls 
  • AAC, aptX, SBC codec support 
  • Ergonomic Design
  • USB-C charging case
  • Supported Profiles: A2DP, AVRCP, HSP, HFP
  • Frequency response: 5 – 21,000 Hz
  • THD, total harmonic distortion: <0,08% (1kHz / 94dB)

However, for those craving more features, for $100 extra, the MOMENTUM True Wireless 2 adds active noise cancellation (ANC) and transparent hearing, smart pause, IPX4 splash resistance, MOMENTUM craftsmanship and a 28-hour battery life (with multiple recharges), compared to 20 hours for the CX 400BT True Wireless.

Price & Availability

The Sennheiser CX 400BT True Wireless earbuds will be available for $199 in black or white on September 15, 2020.

Sennheiser CX 400BT True Wireless Reviews

From Critics Around the Web

Click to comment

Leave a Reply

Your email address will not be published. Required fields are marked *


Our Reviews

Floorstanding Speakers

The Fyne Audio F302 and Monitor Audio Bronze 200 loudspeakers deliver a lot of performance below $1,000. One impressed us more. A lot more.

Integrated Amps & Stereo Receivers

Does the Yamaha A-S3200 integrated amplifier deliver a sonic performance worthy of its $7,500 price tag? The answer won't make the competition happy.

Integrated Amps & Stereo Receivers

The Moonriver Audio 404 (€3000) is an integrated amplifier. Made in Sweden. With a modular design structure that lets users upgrade the modules instead...

Digital Music Systems

The HiFi Rose RS201E Media Player offers both high-resolution audio and video in a category with a lot of compelling options.

Integrated Amps & Stereo Receivers

Proof positive that not all watts are created equal. Especially those designed by Nelson Pass.


Is the AXA35 the best affordable way to reconnect with your music? Indeed it is.

You May Also Like

Earbuds & In-Ear Headphones

The HiFiMan TWS800 wireless IEMs face some stiff competition from Sony, Bose, and Apple.

New Products

Bask in Lamborgini style with either over-ear or in-ear wireless noise cancelling headphones from Master & Dynamic.

New Products

Apple is leapfrogging Beats with the introduction of a high-end over-ear wireless noise cancelling headphone.

New Products

Sleek true wireless earbuds feature EQ customizations via app and a High Performance Sound Mode for audiophiles on-the-go.


ecoustics is the unbiased resource for the latest technology news, coolest gadgets, and best consumer electronics. Plus get product reviews, roundups and deals from all over the web on everything electronic. Read more

Copyright © 1999-2021 ecoustics | Disclaimer: ecoustics may earn a commission when you buy through links on our site.