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Sennheiser True Wireless Headphones CX 400BT, Black

4.3 out of 5 stars 2,396 ratings

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Black
2020
Brand Sennheiser
Colour Black
Connector Type Wireless
Model Name CX 400BT True Wireless
Form factor In Ear

About this item

  • 7m dynamic driver powered with Sennheiser audio expertise
  • Up to 7 hours play back with up to 20 hours available with on the go charging via the case
  • Customizable touch controls; Full control of music calls and voice assistant
  • Ergonomic design optimal comfort and secure fit with 4 ear adaptor sizes
  • Built in equalizer; Personalize the audio experience

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Product Information

Colour:Black  |  Style:2020

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Product description

Colour:Black  |  Style:2020

Superior sound. Tailored to you. Your day to day may change but your enjoyment of superior sound will not. Powered by Sennheiser is leading audio technology, the new CX 400BT True Wireless gives you total control over an exceptional sound experience. With intuitive customizable controls, long lasting battery life and a design made for all day comfort, they are the ideal, uncompromised choice for people that are passionate about great sound.


From the manufacturer

CX 400BT True Wireless MOMENTUM True Wireless 2
CX 400BT True Wireless MOMENTUM True Wireless 2
Colour Variants Black & White Black & White
Battery Life 7h + 13h (earbud + charging case) 7h + 21h (earbud + charging case)
Customizable Controls
Call Function
Active Noise Cancellation
Voice Assistant Access
Internal EQ/Custom Presets
Transparent Hearing
Smart Pause
Splash Resistant (IPX4)

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4.3 out of 5 stars
4.3 out of 5
2,396 global ratings
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Top reviews from Australia

Reviewed in Australia on 29 April 2021
Colour: WhiteStyle: 2020Verified Purchase
4 people found this helpful
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Reviewed in Australia on 6 August 2021
Colour: WhiteStyle: 2020Verified Purchase
One person found this helpful
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Reviewed in Australia on 3 August 2021
Colour: BlackStyle: 2020Verified Purchase
Reviewed in Australia on 6 August 2021
Colour: WhiteStyle: 2021Verified Purchase
Reviewed in Australia on 7 August 2021
Colour: BlackStyle: 2020Verified Purchase
Reviewed in Australia on 26 August 2021
Colour: BlackStyle: 2020Verified Purchase
Reviewed in Australia on 29 May 2021
Colour: BlackStyle: 2020Verified Purchase
One person found this helpful
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Reviewed in Australia on 2 April 2021
Colour: BlackStyle: 2020Verified Purchase
One person found this helpful
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Top reviews from other countries

Martin Majewski
3.0 out of 5 stars Nicht für den Preis
Reviewed in Germany on 2 September 2020
Colour: BlackStyle: 2020Vine Customer Review of Free Product( What's this? )
262 people found this helpful
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john j
3.0 out of 5 stars Great sound , but ,
Reviewed in the United Kingdom on 20 December 2020
Colour: WhiteStyle: 2020Verified Purchase
71 people found this helpful
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Colocolo123
5.0 out of 5 stars 買って良かった。音質、デザイン、装着感いずれも満足!
Reviewed in Japan on 26 September 2020
Colour: WhiteStyle: 2020Verified Purchase
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5.0 out of 5 stars 買って良かった。音質、デザイン、装着感いずれも満足!
Reviewed in Japan on 26 September 2020
ワイヤレスで音質が良いイヤホンが欲しいと思っていました。
ゼンハイザーのMOMENTUM True Wireless 2は高価でためらっていたところ、音質を落とさない中級機が出るということで思わず予約して購入しました。

良かった点
・音質: 
 とても良いです。クリアで聴きやすい音質です。ボーカルもクリアですし、アコースティックギターの響きもきれいです。
これまでソニーのワイヤレスヘッドホンWH-1000XM3を使っていました。
WH-1000XM3はノイズキャンセリング(NC)機能の評価が高いのですが、密閉型でNCを使うと鼓膜が圧迫されるような感じがしてすぐに疲れてしまいます。
これはNC機能がありませんが、その分圧迫感がなく適度に周囲音も入るので聴き疲れしません。
ただ、さすがに低音はあまり強くないです。
・装着感:
 耳にしっかりフィットします。Appleのイヤホンははずれて落ちそうでとても気になりますが、これは安心してつけていられます。
イヤーアダプターが柔らかく、耳を強く塞いでいる感じがしないので違和感もあまりありません。
・大きさ:
 イヤホンの大きさはちょうど良いです。ケースは思っていた以上に小さいです。
5cm(W)X3cm(D)X4cm(H)くらい。どこにでも入れて持ち運べます。これで20時間分も充電しておけるなら十分です。

ちょっと惜しい点
・ケーブル:
 充電用のUSBケーブルはケースに入りません。ケーブルだけ別に持ち運ぶのは面倒なのでケースに入るようにして欲しかった。
・スマホアプリ:
 音質の制御があまりできません。できるのは低/中/高域の3ケ所の音量だけでおまけ程度。
ソニーのような細かい帯域のレベル調整や音場選択はできません。
それだけストレートの音質に自信があるということか。
でも、電話の機能より音質の制御機能を充実させて欲しかった。
・音量レベル:
 基準の音量レベルが低いです。iPhoneにつなげて音楽を聴く場合、普通のイヤホンで聴く場合は半分くらいの音量レベルで聴いているのですが、CX400BTでは目一杯上げてちょうど良いくらいです。      
目一杯音量を上げても、イヤホンを切断すると元の音量には戻るようです。
でも、もう少し基準の音量を上げて欲しいところです。
★訂正→使っているうちに十分な音量レベルになりました。充電時間かエージングが短かったのか? 今は問題ありません。
・タッチ機能:
 イヤホンにタッチすることで電話の応答、拒否などができます。
ただ、電話してない時ちょっと触っただけでSiriが応答します。電話の応答や切断もできますが、個人的には音楽再生重視なのでいずれ設定をカスタマイズしようと思います。

トータルとして、ワイヤレスでも音質が良く、聴き疲れしません。デザインもシンプルで気に入ってます。
新幹線の移動などがより楽しくなりそうです。買って良かったです。
------------------------
追記です。
使っているうちに低音もでてくるようになりました。やはりエージングが必要だったのかもしれません。
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143 people found this helpful
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Amazon カスタマー
3.0 out of 5 stars 最高の音質?
Reviewed in Japan on 1 October 2020
Colour: BlackStyle: 2020Verified Purchase
125 people found this helpful
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GI Chow
5.0 out of 5 stars Jaw dropping sound
Reviewed in the United Kingdom on 1 January 2021
Colour: BlackStyle: 2020Verified Purchase
Customer image
5.0 out of 5 stars Jaw dropping sound
Reviewed in the United Kingdom on 1 January 2021
I was both disappointed and elated when I heard the cx400 because I am a real fan and advocate of how far budget audio has come especially in the area of tws Bluetooth earbuds. As it turns out not yet quite far enough.

From the moment I put these in my lugholes I knew these were something special. No driver break in required. No tip change even though the mediums they came fitted with looked a little on the small side. Instant audio cocaine. Blown away listening to a starter of Orbital and stayed for the main, pudding and cigars..even though I had already had lunch when they arrived at my locker.

Elbow's Guy Garvey and Shakka Ghetts (Spotify on shuffle) were singing to me in the bedroom I had escaped to so as to audition these latest additions to my musical stable.

Before I knew it Theodore Shapiro's Ecstasy had me in a flood of tears..are these IP rated? (turns out not so perhaps not for use out on the bicycle in the rain)

I have recorded the sound of these on my Amazon profile and comparisons to some audio TWS bargains that get very close for a fraction of the price of these but are not quite there - yet.

No sibilance but all the energy in the Radiohead Creep line 'so ... special' - and these earbuds are.

I might just need to keep these on/in forever..maybe I'll stop listening should my mere physical frame compel me to get up to sustain it but if I don't certainly my soul would not have starved with these beauties in. 

Samsung Adapt Sound (Samsung's proprietary equaliser that measures your hearing of the frequency spectrum so any shortcomings due to either the listener or earphone native response can be equalised out) shows frequency response at good level across the frequency spectrum with mild emphasis on the lower mids and treble, a kind of double hat rather than typical V or U or W shaped tone curve.

Vocals have a natural fullness and richness and intimate 'voice in your ear' presentation and while those who prefer a more analytical sound with voices brought to the fore and isolated from bass sounds may favour a less balanced sound signature for me these are breath taking.

Downsides - they are on the chunky side (though light at 6g each) and there is no IP rating limiting their use in the rain or gym. To tell when they need charging one needs to remember to press a button on the back of the case and decode the meaning of the coloured light rather than this being immediately visible on the front after replacing the buds in their case which is something much cheaper earbuds manage to do. They cant do all of the pure visceral bass of Hans Zimmer's Why so serious but these little (ok maybe not so little) bullets deliver some tardis like magic and as good a representation as I have heard in the TWS form factor.

I had various issues the biggest being  noticeable lag watching YouTube. I also had the touch controls working initially but then not being responded to correctly however both were resolved after resetting the earbuds, and doing a software update via the app - took 40 mins! during which time they need to be kept out of their case (though continued listening to them).

Mentioning these practical considerations just seems churlish though. Amazon needs a 6th star for these.

It's a bit of a cliche but I continued to listen to music I know well as if for the first time..and wrote this review while doing so to justify my time going over old ground made fresh!

Suddenly every other TWS I own just makes sounds - these make music. Credit to Sennheiser for making a more accessible version of their Momentum 2 TWS available and I hope such wonderful sound in time becomes accessible at an even more affordable price point.
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