NEW Sennheiser CX-400BT – Great True Wireless Earbuds?

Today, we are taking a look at the brand new Sennheiser CX-400BT. They are truly wireless earbuds and are selling at the under $200 range.

NEW Sennheiser CX-400BT


  • Excellent sound

  • Good touch-control

  • Great app

  • Good battery life


  • Not the smallest earbuds

  • Not IPX rated 

This price range is currently a really crowded space as you have just got so many different earbuds out there from different brands.

Some of them are open design, some of them have great battery life, some of them have great fit, some of them are waterproof like you just have a lot going on.

And if you want all of the different features and you don’t want to compromise stuff, you are going to have to pay like over $300.

Typically, the first thing that gets compromised when you are going down to a lower price point under $200, is typically the sound quality.

So, the Sennheiser CX-400BT true wireless earbuds comes in a very specific part of the market having the best sound quality at under $200 and so, that’s really the angle Sennheiser is taking here.

In this article, we really want to break down what compromises Sennheiser had to make for the Sennheiser CX-400BT earbuds, how good the sound quality is? And much more.

Sennheiser CX-400BT

Starting off with the physical design of the Sennheiser CX-400BT wireless earbuds, the case is an all plastic design.

There are two different colours, the white and the black. The case is not the smallest but it is small enough that it fits in your pocket, in your purse and in the palm of your hand.

Overall, it’s an earbud case and you get the idea. It’s going to do essentially what you need it to but it’s not going to be the most premium flex out there.

It doesn’t have a metal hinge and it’s not super small but it gets the job done. On the back, we have the USB-C charging port, a LED indicator on the back and a button. 

Flipping it open, the earbuds themselves are relatively small. They are smaller than a lot of other earbuds out there.

But of course, being like the Samsung Galaxy Buds Live came out and they are so much smaller that the Sennheiser CX-400BT are starting to look a little bit larger in 2020.

They are not the smallest wireless earbuds out there but you know they fit in your ear, they stick out a little bit but not that big.

Sennheiser CX-400BT best wireless earbuds have a touchpad on the outside of the earbuds and four nodes on the inside. So, they can sit there magnetically and if you flip the case over and shake it, the earbuds don’t come out.

So, as you can probably tell by now and like we said, the focus of the Sennheiser CX-400BT earbuds is absolutely the sound quality.

As far as the fit and design goes, to summarize it, they are okay. They didn’t make the smallest earbuds, didn’t make the best looking earbuds, didn’t make the sleekest case but it’s far from the worst and it definitely gets the job done.

Connectivity - Sennheiser CX-400BT

Sennheiser CX-400BT

The Sennheiser CX-400BT truly wireless earbuds are using Bluetooth 5.1 which is really exciting because until recently, we have really only seen these on like the $350 pair of earbuds out there.

So, seeing that creep down into the lower sub $200 earbuds here is definitely a big plus. Now, realistically, most devices won’t have any kind of significant difference between 5.0 and 5.1.

But there are a few extra features that in the future will probably become more prominent like finding the earbuds and stuff like that 5.1 is able to do.

So, having this on the Sennheiser CX-400BT best Bluetooth earbuds is a little bit more future proof. 

There is also a Master Slave Bud Connection system which means that they connect to the right earbud and then the left earbud connects to the right one.  

Sennheiser always does this and we typically don’t prefer this and we think single point connection is better for quite a few reasons.

But essentially what this means is you cannot listen to just the left earbud, you have to listen to either just the right or both in order to use these earbuds.

As far as lag goes with the Sennheiser CX-400BT, it was coming around 500 milliseconds which is not necessarily fast. 

But if you are watching YouTube videos and stuff like that, you are not going to notice any kind of lag because a lot of Apps do compensate for that.

But if you are playing games, you are definitely going to notice like around a half a second lag with the Sennheiser CX-400BT earbuds.

Sound Quality - Sennheiser CX-400BT

When you are listening to music, this is where the Sennheiser CX-400BT wireless earbuds really start to get amazing.

We found the music sounds really bright but also warm and full at the same time and just gives you a really nice balance without even having to change the EQ.

The clarity is excellent and there is a lot of clean instrument separation which sounds really accurate, very true to life and overall we just found the earbuds sound very pleasant to listen to.

The instrument overtones are very distinct and well separated. So, like the bass drum for example, you really hear every part of the drum and it’s not just a thump, it’s actually like you can tell it is a bass drum.

We found that the volume on Sennheiser CX-400BT, we have to turn it a little bit higher than some other earbuds. 

If you are somebody that listens at max volume, you might find that the Sennheiser CX-400BT are not the loudest earbuds out there for you.

On top of that, the fit is a little bit finicky but once you get it right you definitely have significantly better sound quality.

So, you wanna make sure that not only are you finding the right ear tip like there are four different ear tips but you also put it in your ear properly for better sound experience.

In the testing, we found that the Sennheiser CX-400BT absolutely nailed and sounded really good and crisp and you can really hear all the different instruments even when it is really cluttered in the most noisy part of the song.

When listening to bass, the Sennheiser CX-400BT are definitely very prominent and typically really finicky things for a lot of other earbuds because either the bass is really prominent and it kind of sounds muddy.

But we found that the Sennheiser CX-400BT earbuds had an excellent balance. Again without even having to change the EQ in the App.

Overall, the sound quality on the Sennheiser CX-400BT earbuds is absolutely incredible. We really can’t recommend that enough and it’s obviously the highlight of these earbuds.

App features - Sennheiser CX-400BT

Sennheiser CX-400BT

Getting into the App features, the first feature we want to mention is the autoplay and auto pause does not exist on the Sennheiser CX-400BT earbuds.

Looking at the app, you have an equalizer and that’s the first thing you could do and you can slide the dot around. It’s kind of Sennheiser’s way of making an equalizer.

So, you can go to bass to treble and up and down changes the levels of things. It gives you a pretty cool interface there.

But if that is confusing for you, you can also go over to the three bars and having three bars might be easier to change the bass, the mids and the trebles.

Going back we have connections, the Sennheiser CX-400BT sort of have multi-pairing or multi-connection features. So, you can change between different devices.

But it is a little bit weird here. You have to do it on the app and it’s not going to seamlessly do that as we are seeing with some other devices.

If you go up to the settings in the top right, we can change some things about the earbuds. So, for example, if you want to change what touchpads are doing, you can do that here.

And other than that you really don’t have anything you are doing in the app. But that’s really all you need to do with the Sennheiser CX-400BT earbuds.

Unfortunately, the Sennheiser CX-400BT do not have any kind of Transparency Mode, no Pass Through mode and they don’t have Active Noise-Cancellation either.

So, if you want to hear your surroundings, you are going to have to take the earbuds out.

Battery Life - Sennheiser CX-400BT

The battery life on the Sennheiser CX-400BT true wireless earbuds is amazing. You get seven hours in the earbuds and 20 hours total which kind of just sums up what these earbuds are like in general.

Final Verdict

So, the Sennheiser CX-400BT earbuds are not the most exciting. They are almost a little bit boring in a lot of aspects.

The design, the overall fit, the overall feature set, app, like there is a lot of stuff that they work and they work well but they don’t give a ton of extra features.

And if you are looking for features you are probably going to be happier with something like the Samsung Galaxy Buds Live.

But would these really do well is the sound quality. That is why you would be buying these earbuds.

So, in conclusion, if your only priority is sound quality and you are looking to spend under $200, the Sennheiser CX-400BT are the perfect pair of earbuds.

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