Following the success of the Sennheiser Momentum True Wireless 2, the German audio company has launched a shortened version with a compact square design that is the CX 400BT True Wireless.
The charging dock is also made of rough plastic, the hinge is solid, creating a sense of security, the charging box lid has a shiny Logo. There are grooves around the edge of the lid for easy manipulation when opening. Inside there is a very strong magnet to the headset, so there is no fear of falling.
The Sennheiser CX400BT uses Bluetooth 5.1 for more stable signal transmission with codec standards with aptX, AAC, SBC. The headset connects well with many mobile devices and popular sources on the market with bluetooth 4.0 or higher standard.
The headset is not completely independent, and there is a primary and secondary side. The R side is the main and has a microphone, the L side is a secondary without a Microphone, so those who listen to calls a lot and like to use one ear will still be able to use the R side normally.
Smart Control (available on iOS / Android) is a smart application that supports many interesting features such as customizing the sound quality through the EQ (Equalizer – equalizer) to adjust the sound of many different types of music. After setting up on the app, the customizations will be updated to the headset immediately.
The battery life of CX 400 BT is only 6.5h + 13.5h charging case = 20h total (7.5h less than Momentum TWS2 is 21 hours). Compared to other headphones in the same price range, the CX 400BT’s battery life is enough for a few days.
Very easy to listen to, everything is just right, not too much, not too much, comfortably balanced in all frequency bands. Bass has power and depth, Mid and Treble are both very clear and separate, no sound comes out even at the highest volume without distortion.