Sennheiser has consistently produced some of the best sounding true wireless earbuds in the market, but those earbuds have always been on the pricey side. Well, the brand has now launched a more affordable “mid-range” offering, the Sennheiser CX 400BT. 

The CX 400BT inherits a few things from the Momentum True Wireless 2, the biggest being the same 7mm dynamic driver. There’s no ANC on these though, but the passive seal delivered by the earbuds results in quite a bit of noise isolation. The earbuds fit snugly in the ear, and they’re comfortable even after long periods of use. There are three additional ear tips provided in the box, so you should be able to find a good fit. 

If you’re expecting the same premium product as the MTW 2, you won’t get it, unfortunately.  The charging case is now all plastic, and it’s actually a tad bit taller than the MTW 2’s case, but it’s slimmer at the same time. The earbuds are also fully plastic now, with a glossy faceplate instead of the brushed metal faceplates on the MTW 2. 

There are still touch controls though, and it’s responsive and quick. One good thing is that false touches around the side of the faceplate aren’t easily registered, so you won’t accidentally pause your music or skip tracks when adjusting the fit of the earbuds.

These earbuds also have the same customisability for touch controls that the MTW 2 had, with the ability to choose exactly what each tap, double-tap, triple-tap and more does. Of course, this is only able to be changed in the Sennheiser Smart Control app.

You will also find a simple equaliser in the app, but what’s improved is that instead of only having the parametric EQ, there’s also a three slider EQ option, one each for bass, mids and treble. It would have been nice to see sliders for multiple bands, but at least the slider option is there.

The sound quality on these is exactly as you’d expect for something that comes from Sennheiser, with a clear and detailed sound. I particularly like the low-end performance of these. The bass is impactful and detailed with plenty of texture, while the mids are relatively flat with a gentle warmth that peeks in from time to time. 

I do feel that there’s a bit of energy and sparkle missing in the highs though, but that can be adjusted via the EQ feature if needed. The soundstage is actually quite wide, with plenty of air and separation. You definitely won’t feel these are too cramped.

They run on Bluetooth 5.1 and the connection is rock solid. There’s also aptX in addition to SBC and AAC, so you’ll really be able to enjoy high-res files from Tidal or other streaming sites.

Battery life on these is pretty good, with seven hours in the earbuds and another 13 hours in the carrying case for a total of 20 hours. Granted, it doesn’t match up to the total 28 hours of the MTW 2, but these aren’t meant to compete with their big brother. At S$299, these aren’t the most affordable either. But for what you get, I think it’s a worthwhile buy.

For more information on the Sennheiser CX 400BT (S$299) or to support us, get it on Amazon here.