Sennheiser CX 400 II
 | Outdated Product Design: in-ear; Connection type: wired; mini-Jack (3.5 mm); Cable supply: double-sided; Cable length (m): 1.2; Impedance (Ohm): 16; Frequency range (Hz): 17 – 22000; Sensitivity (dB): 114; Volume control; |
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in-ear, wired, detachable cable, 3.5 mm, 1.25 m, no microphone, 10 – 20000 Hz, 24 Ohm, L-plug
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in-ear, wired, detachable cable, 3.5 mm, 1.2 m, no microphone, 20 – 40000 Hz, 24 Ohm, L-plug
Sennheiser CX 400 II
Type:in-ear
Connection:3.5 mm
Frequencies:17 – 22000 Hz
Sensitivity:114 dB
All specifications
Specifications CX 400 II
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E-Catalog UK editor, Headphones
Olexandr Cherkashchenko, edited 08.04.2026
The information in the model description is for reference purposes.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog Sennheiser 2026 - new arrivals, bestsellers, and the most relevant models Sennheiser.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog Sennheiser 2026 - new arrivals, bestsellers, and the most relevant models Sennheiser.
Everything You Need to Know About Headphones: A Complete Technical GuideThe choice begins with understanding the design and features.
What characteristics should good headphones have?Guide to key features of headphones
Series Sennheiser CX (in-ear)Compare using chart →
in-ear, wireless, true wireless, Bluetooth v5.2, AAC, aptX, active noise cancellation, waterproof, 5 – 21000 Hz, battery: up to 6 h
in-ear, wireless, true wireless, Bluetooth v5.2, AAC, aptX, waterproof, 5 – 21000 Hz, 16 Ohm, battery: 55 mAh, up to 9 h, with case + 27 h
Model overview based on user reviews
The Sennheiser CX 400 II headphones offer clear and high-quality sound, making them a popular choice for those who enjoy music during active pursuits like running or walking. They are lightweight and compact, fitting comfortably in the ear without falling out. Users appreciate the standard connector, which allows easy connection to various devices. While some reviews mention concerns about Chinese replicas, the original product is praised for its excellent build quality and durability, with one user noting their pair has lasted four years without issues. The headphones are considered a good value for the price, appealing particularly to young, active individuals who value both sound quality and style.
Pros
Cons
0 0 0 5 |
they don’t sound bad for the Chinese, but the original is of course much better. I have something to compare with. I have the original ones. These were taken for my daughter. Now I'm selling. i bought it in a sound store, they put it in China! It’s very easy to tell the difference: the volume in the original is turned off completely, but in the Chinese it’s not. assembly - on the original without a single crack, these ones have a noticeable crack. and the original box cannot be placed vertically on the table because of the notch on the packaging. you can easily install the Chinese one use Sennheiser CX 400 II week |
I have long dreamed, or rather was going to buy high-quality headphones that would meet my requirements. In fact, the model is very successful and you can safely listen to music while running or actively walking, since it sits very well in the auricle and does not press at all. I can walk in them for half a day and everything is fine. The weight of these headphones is light and they can easily fit into any small pocket. The sound is very clear, without any distortion. If the recording is, especially licensed, then the sound comes with stereo sound and it is very pleasant to listen to good music. I can practically distinguish all the sounds. When listening loudly, the hearing does not hurt and the ears do not get tired, and this is the key to the health of the eardrum. It’s better not to waste money and listen on high-quality equipment. The connection connector is standard and you can easily connect to various media devices, such as a mobile phone, tablet, etc. So there will be no problems with connection and the old factory headphones can be thrown into the box for a long time. The price of the headphones, although it seems high, is justified and, in principle, there is something to pay for. In a word - price and quality coincide. Finally, I will say that this model will appeal to the young segment of the population who lead an active lifestyle and love to spend it with excellent music. The sound of the headphones is very clear and meets the requirements. It’s a pretty good model and looks very stylish, being light in weight and very compact. When listening, the sound is very clear and does not hurt the ears. It is very comfortable to fit into the ear and does not fall out during active running or walking. The connector is standard and therefore can be connected to various media devices, such as a mobile phone, tablet, etc. Very attractive price for such quality. Didn't see use Sennheiser CX 400 II week |
I really liked the headphones. The high-quality sound is very loud. I advise you to choose only them, you will not regret the choice. There are a lot of them. No  Anastasiya: use Sennheiser CX 400 II month or more i recommend it should buy |
3 out of 5 user review(s) shown
2 more user review(s)
Popular questions
Can they be connected to a modern smartphone?
Sennheiser CX 400 II connect directly to devices with a 3.5 mm jack. A compatible adapter will be required for a smartphone without an audio jack, as this is a wired model with a standard mini-jack.Source:Specifications
Won’t the volume slider get in the way during everyday use?
The volume control on the Sennheiser CX 400 II cable may not be the most successful feature: it can easily be moved accidentally under clothing, and some owners complain about imprecise adjustment. If the volume is usually changed on a smartphone or player, this feature will not be a decisive advantage.Source:General information
Are the Sennheiser CX 400 II suitable for noisy public transport?
They are suitable for use on the go thanks to their in-ear fit and interchangeable silicone tips. Buyers often note good external noise reduction, especially with properly fitted tips, but the overall isolation depends on the shape of the ears and the snugness of the fit.Source:SpecificationsGeneral information
What should you consider when buying Sennheiser CX 400 II on the second-hand market?
It is worth carefully checking the product’s origin and the condition of the cable, plug, and volume control. Reviews repeatedly mention counterfeit products, as well as cases of one channel failing after prolonged use, so it is safer to choose an item with a clear purchase history.Source:General information
Are the Sennheiser CX 400 II suitable for bass-heavy music?
More likely yes, many owners note deep and pronounced bass that comes into its own in electronic and dynamic music. At the same time, the sound may seem too dense in the low frequencies, so vocals or classical music may sometimes require equalizer adjustment.Source:General information
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