Sennheiser CX 400BT review

The Sennheiser CX 400BT is a really solid mid-range TWS headphone, but bargain hunters might want to look elsewhere if ANC is important to them. Still, high-end audio hardware at a mid-range price is a good bargain in our opinion.

Features Ratings

Overall Rating

Verdict & Summary

The Sennheiser CX 400BT have a warm sound profile. They have a slightly boomy bass, but voices and lead instruments lack detail and presence, which can hurt in vocal-driven genres like audiobooks or pop music.

The Sennheiser CX 400 BT true wireless earbuds are a set of earbuds from a renowned manufacturer of audio equipment that focus on the essentials without incorporating a tonne of extra features. It’s uncommon to find something straightforward in a market where wireless earbuds are experimenting with a variety of features to differentiate themselves, from Qi wireless charging cases to active noise cancelling. The CX 400s, on the other hand, maintain affordability while delivering a rich, powerful sound response that will exceed even the highest expectations. you can buy this product from amazon.

To be fair, you’ll receive a lot of the things you want, like premium Bluetooth codecs to support the high-caliber sound and respectable, if unspectacular, battery life. However, clear, high-quality audio is the name of the game here, so I was curious to see if the promises were kept. Momentum Wireless 2, Sennheiser’s top-tier true wireless earbuds, were just released.

The business opted to create the CX 400BT to target the mid-segment after releasing its flagship earbuds. These brand-new Sennheiser true wireless earbuds are available for purchase and they guarantee a rich audio experience. To determine whether they fulfil their promises, we used the device for a while. The Sennheiser CX 400BT review is presented here in its entirety.

Sennheiser CX 400BT review: Design

The original Momentum True Wireless had hefty earbuds that protruded dramatically from your ears. The second-generation Momentum True Wireless II from Sennheiser wasn’t significantly smaller, but it was just enough for the earbuds to fit more comfortably.

As I listened for extended periods of time, I noticed myself adjusting the CX 400BTs to relieve pressure on particular areas of my ears because they are more in-ear than the original Momentum True Wireless. Their comfort level would depend on the shape of your ear, although they would appear less than perfect for people with smaller ears.

Four different sized ear tips are included with the earphones. I typically use a big or XL tip, but the CX 400BT provided the snuggest fit with medium-size tips. These are comfortable enough to use during light exercise, but unlike the Momentum True Wireless II, they don’t have a rating for water or sweat resistance, so I wouldn’t trust them to stay in my ears while jogging. In that regard, they resemble the Sony WF-1000XM3, which isn’t designed for use in sports and isn’t sweat- or water-resistant.

Sennheiser advises twisting these into your ears with a anticlockwise spin, which I did in order to create a tight seal that will maximise sound. And with a tight seal, these sound fantastic, though not quite as fantastic as the Momentum True Wireless II, which have the same dynamic 7mm drivers but appear to have a bit more bass (it could be that the fit had impact but I just thought the Momentum True Wireless II had a tad bigger, richer sound).

Sennheiser CX 400BT review: Comfort

With earbuds, touch controls can occasionally be hit or miss, but the CX 400BT’s touch panels’ relatively wide, flat surface area makes the controls simple to use and reliable. Although this is more of an observation than a criticism, the Sennheiser’s design is more practical than fancy.

Their oval housings need to be gently prodded into the ear canals in order for them to fit securely; gentle prodding is preferred to rough handling. Once in place, they are light weight (6g apiece) and unobtrusive. They will somewhat protrude out of shallower ears because they are just over 2 cm deep. The four different sizes of silicone ear tips that come in the box ensure that the fit is as adaptable as you could imagine.

Sennheiser CX 400BT review: Connection

As with any other Bluetooth accessory, pairing the CX 400BT with your phone is simple. To see the earbuds, open the case. The moment you take the earphones out of the case, they’ll begin their automatic search for a compatible device. Locate the “Sennheiser CX 400BT” in the dropdown list in the Bluetooth settings panel of your phone, and then proceed with the standard pairing process. If the Bluetooth radio is turned on, your headphones will then automatically couple to the same source whenever they are removed from their case after this.

Sennheiser CX 400BT review: Sound quality

The Sennheiser CX 400BT confirms my experience, which is that advanced Bluetooth codec support and high sound quality go hand in hand. The Sennheiser CX 400BT sounded excellent when paired with an Android smartphone that could enable the Qualcomm aptX codec, which significantly improves sound quality. The Sennheiser Momentum True Wireless 2, which is now my top pick for musicality among true wireless earbuds, offered sound quality that was basically comparable.

For the most of this evaluation, I used an Android smartphone, but I also tried the Sennheiser CX 400BT with my MacBook Air and an iPad mini for reference. Although I prefer Spotify for daily listening, I found that the Sennheiser CX 400BT’s mix of good driver tuning and technical prowess made me prefer Tidal’s high-resolution streaming.

Using high-resolution files and pushing the volume up to about 90% brought out the best in these earphones, while the CX 400BT sounded wonderful with any genre of music and at all volumes. The earbuds brought out a tonne of detail in Bruno Mars’ Chunky and Marvin Gaye’s Ain’t No Mountain High Enough, making for a really delightful listening experience. Even the most subtle components of Chunky’s beat felt authentic and present, while Gaye’s voice sounded crisp and full of personality.

Sennheiser CX 400BT review: Battery Life

Sennheiser claims that each individual charge will provide up to 7 hours of playback time; however, repeated usage of the charging case will increase this to a maximum of 20 hours before the entire system runs out of juice.

The CX 400BT itself can last for longer without interruption, however the latter number is less than the 24 hours provided by the 2nd generation AirPods. The CX 400BT allowed me to listen to music continuously for 5 hours and 17 minutes before they had to be put back in their case. That is over a half-hour longer than the 4 hours, 49 minutes that the AirPods offer.

Even though I stayed within the 25-50% volume limit, that is still noticeably less than the advertised 7 hours. However, five hours or more is an excellent runtime for wireless earbuds in general, so it’s difficult to be too upset with this performance.

The CX 400BT provided a solid 54 minutes of playing from just 10 minutes of charging, and the same is true for charging speed. However, the AirPods trump them in this department since they can deliver up to 3 hours of listening time after only 15 minutes of charge. Additionally, I wish the battery could be measured in increments smaller than 10%. It can be challenging to determine whether you have an entire hour or fewer than 30 minutes left when you’re running low.

Final Words

Why would you need any more when you already have two excellent-sounding true wireless earbuds in your arsenal one with ANC at the higher end of the market and one without at the lower end in your arsenal.

Although a third set of completely wireless Sennheiser headphones would have been justified in this case, we would have preferred the CX 400BT to have a more adaptable, sportier style. Sennheiser is without a doubt the leading German audio company when it comes to sound quality. At their initial launch price, the CX 400BT would have been recommended, but at their current price reduction, they provide a genuinely exceptional deal.

George Southwell
George Southwell
George Southwell is a writer for Bollyinside who has a passion for classic cinema, architecture, entertaining friends through the art of the kitchen, and guiding others in the purchase of consumer technology items that meet their specific needs. You could find him in a figure drawing class, a movie theatre, or just standing in the middle of a sidewalk and staring at a building when he's not writing.


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The Sennheiser CX 400BT have a warm sound profile. They have a slightly boomy bass, but voices and lead instruments lack detail and presence, which can hurt in vocal-driven genres like audiobooks or pop music.Sennheiser CX 400BT review