Sennheiser CX 400BT VS. Momentum 2: Which one is better?

These are the new Sennheiser CX 400BT. They are Sennheiser’s latest pair of truly wireless earbuds that sound just as good as the Momentum 2 but at a more affordable price point.

If you are looking for a pair of great-sounding earbuds, then these might be up your alley. We will compare Sennheiser CX 400BT Vs Sennheiser Momentum 2.

Sennheiser CX 400BT Vs Momentum 2

Sennheiser CX 400BT Vs Sennheiser Momentum 2 Review


First, discuss their price. As mentioned, momentum 2 is a little expensive, reaching under $300.

But in addition to great listening, momentum 2 also has active listening cancellation and an ambient mode.

The retail price of the CX 400BT is almost $200. I am comparing them to mainstream wireless earbuds.


Let’s talk about the case. The CX 400BT includes a reasonably small case with a tiny step up from the AirPods Pro case. However, in this case, it is remarkably dense. You won’t notice this case much when you get it in your pocket.

But many other mainstream cases like AirPods or Galaxy Bud Live will be less noticeable because they are less thin if you have them in your pocket. However, this case is noticeably smaller than the momentum 2 case.

This plastic case has a powder coat finish, which helps you get a good grip when you take out your earbuds. The earpiece has a very satisfying snap whenever you open or close it and, in this case, also has a strong magnet, which helps to move your earrings away.

Overall, I like this case, and it is shallow enough to carry wireless earbuds properly every day, but there are more slender cases. I don’t want to mention that Momentum 2 fits within the 400BT case. I hope the momentum of true wireless 3 can get even smaller cases in the future.

Tech Space

Let’s talk about tech space. This carrying case charges via a USB C, but there is no wireless charging in this carrying case.

Now I don’t think about wireless charging in my earbuds, but I don’t want to mention it for those who use the phone with power-sharing or have already invested in a few wireless chargers.

Battery Life

Regarding battery life, these earbuds have a battery life of 20 hours. The earbuds can last up to 7 hours, and the case can provide an additional 2 full charges. Now 20 hours of integrated battery life will get the job done. But nowadays, we see more and more mainstream earbuds that last 25 hours.


These earbuds fit just like the Momentum 2. They don’t fit as deep into your ear canal as the Sony WF-1000XM3, which sounds unnatural. They also don’t rest on your ear canal’s edges like AirPods Pro Do, which you must always re-adjust.

These earbuds fit your Galaxy Bud Plus or Jabra Elite 75. Yes, these earrings look huge, they are very lightweight, weighing 6 grams, and their problems will not disappear.

Bluetooth connectivity

Regarding their Bluetooth connection, just like the Momentum 2, these earbuds still use a hero and sidekick setup. This means one earbud.

In this case, the right earbud establishes a connection to your phone, and the relay is connected to the left earbud.

So, if you want to use one earbud at a time, you have to use the right earbud, in this case, right. And also, these earbuds can only be connected to one device at a time.

Watch movies or videos

More importantly, when it comes to watching movies or videos on your phone. Whether using an iPhone or Android, these earbuds have zero latency across the board. And when it comes to audio codecs, these earbuds support SBC, AAC, and APTX.


Let’s talk about listening to music with these earbuds because they are all about these earbuds. The CX 400BT sounds identical to Momentum 2, Which is fantastic.

Besides having excellent clarity, instrument separation, and a complete sound stage. These earbuds have an immaculate bass to them that resonates very deeply.

For the most part, I just like using these earbuds with their stock EQ cause with their stock EQ. These earbuds sound very balanced.

You can hear vocals and small details just fine. But when the bass comes in, it comes in hard. If you want to, you can always adjust their EQ. Thankfully, Sennheiser Updated the EQ in their app a few weeks ago.

You have still got their classic single-knob adjuster. You can now independently adjust the bass, mids, and treble on these earbuds giving you more control. So if you want a bass-heavy EQ, you can raise the bass on these earbuds.

You can also up the middle and treble on these earbuds. You can hear the vocals cause before. If you wanted a bass-heavy EQ on Sennheiser’s earbuds or headphones, they would sound external reason the midst would get pushed down.

Or, if you wish for a more vocal-focused EQ but still want a little bass, you can also do that. In general, the Sennheiser Momentum 2 is my favourite-sounding pair of truly wireless earbuds.

I genuinely feel that these earbuds are an excellent alternative to a couple of over-ear headphones. I will admit that they are pricey and could be hard to justify for some people.

So that’s why I am so amped about the CX 400BT. You are getting that same great sound but at a more affordable price. And whether you like a rich bass-heavy eq or a more neutral or vocals-heavy EQ, these earbuds should be able to please everyone.

Media Control

Regarding media control, just like the Momentum 2, the CX 400BT has a touchpad. These touchpads are strictly tap-based, meaning they have no swipe gestures. You can tap to play music or break.

You can double-tap to avoid a track, triple-tap to return to the track, and press and hold to adjust your volume. Overall these touchpads are very accurate.

They rarely miss any input for me. If you want, you can always customize these touchpads to your liking now though I’m a massive fan of the CX 400BT because of their sound. Eventually, these earbuds are the watered-down version of Momentum 2.


Now obviously, these earbuds don’t have active noise cancelation, and I think that is a given. But unfortunately, these earbuds don’t have an ambient mode, nor do they have proximity sensors.

So that doesn’t pause your music when you take them out of your ears. And to be frank, proximity sensors and an ambient mode are standard features for mainstream earbuds in this price range.

Now even though I do love how these earbuds sound. I have to point out those two significant shortcomings that are useful for commuters and everyday use.

Microphone Test

Finally, here is the microphone test, and overall the microphone on the Sennheiser CX400BT is decent. This microphone is not doing the best job blocking the ambient noise as this AC unit found here, but it is doing something.

Because if we switch on my lapel microphone, you can hear that AC unit. But it goes down a bit if we go back to the CX 400BT.

This is me in a quiet room, and in this situation, this microphone is used for phone calls. For comparison, here’s a microphone test with the Galaxy Bud Live, where not only does my voice sound incredible, but this microphone works great for blocking ambient sound.

Because again, if we switch to my lapel microphone, you can hear that AC unit. But if we could go back to the Galaxy bud, it was gone.

Final Word

If you are looking for a pair of genuine wireless earbuds and sound, over CX 400bt is your top priority. They should be able to please people who prefer either massive EQ or neutral EQ.

And if you are hesitant about picking the Momentum 2 because of its price, the CX 400BT is an excellent option. They even have a smaller case here, which is a plus. But these earbuds do come with some compromises.

Their lack of ambient mode and proximity sensors sticks out like a sore thumb compared to other wireless earbuds at this price point. But as I said, if sound is your main priority, this will not disappoint.

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