Sennheiser CX 300 II (502737)
 | Outdated Product Advanced in-ear headphones, designed for both good volume and richness of sound: at 16 ohms, their sensitivity is 113 dB, and the frequency range is claimed at the level of 19 – 21000 Hz. The model is available in 7 colour options, and for the convenience of selection for the individual characteristics of the ear, a set of silicone tips is included in the kit. The package also includes a carrying case. The standard 3.5 mm plug is gold-plated. |
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Sennheiser CX 300 II
Type:in-ear
Connection:3.5 mm
Frequencies:19 – 21000 Hz
Sensitivity:113 dB
Advanced in-ear headphones, designed for both good volume and richness of sound: at 16 ohms, their sensitivity is 113 dB, and the frequency range is claimed at the level of 19 – 21000 Hz. The model is available in 7 colour options, and for the convenience of selection for the individual characteristics of the ear, a set of silicone tips is included in the kit. The package also includes a carrying case. The standard 3.5 mm plug is gold-plated.
All specifications
Specifications CX 300 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 300 II headphones are praised for their excellent sound quality, particularly in the highs and mids, with a rich bass that can be enhanced with an equalizer. Users appreciate their comfortable fit and effective noise isolation, making them suitable for both indoor and outdoor use. However, there are concerns about the durability of the cable, with several users experiencing issues with the plug and wire contacts over time. The headphones are considered a great value for money, though buyers are advised to ensure they purchase the original product due to the prevalence of counterfeits. Despite some durability issues, many users find them to be a reliable choice for everyday listening.
Pros
Cons
1 1 5 7 |
This is probably one of the best headphones in the world in their price category. There are a lot of positive reviews and for good reason. I listened to a lot of headphones including sony, jbl and even marshall mode eq that cost almost $ 100. Compared to these, they were not even close. And here it’s not even about the pricing policy. The only minus who is going to buy them is the very quality of the cord, it’s too thin at the branching points and the headphones themselves don’t have any thickening from the kink. Therefore, if you pull them with a dope or catch them, they’ll get fucked and it’s really So)) Bass sound quality and vacuum are on top. There are no equal!) Cord quality use Sennheiser CX 300 II less than month |
If you need headphones and don’t have a lot of money, then definitely these -sound is super -design is attractive (as for me) -noise isolation is okay (comfortable to travel in a minibus or bus) -cable length is more than sufficient after 3 years they began to play a little quietly, but it’s not so noticeable  Egor: use Sennheiser CX 300 II more than year |
I would choose a different model, the jack (plug) is disgusting, after a month it began to die. Before this there was the same model, the plug died in the same way, but it lived longer. The sound is not bad, but still not satisfying, the highs/upper mids are too much. Horrible, disgusting plug.  Iosif Kacman: use Sennheiser CX 300 II few months |
3 out of 14 user review(s) shown
10 more user review(s)
Popular questions
Are they suitable for active walks and sports?
Sennheiser CX 300 II are more suitable for leisurely walks and trips than for running or windy weather. Reviews mention complaints about noise from the cable rubbing against clothing and wind noise, which can be distracting during active movement.Source:User ReviewsExpert reviews
Will the Sennheiser CX 300 II provide enough noise isolation for public transport?
With properly fitted silicone ear tips, they noticeably reduce ambient noise, so you can listen to music on public transport without turning the volume all the way up. This is passive isolation, not active noise cancellation; outdoors, you should pay closer attention to surrounding sounds.Source:Specifications
Do these headphones require a separate amplifier?
The Sennheiser CX 300 II can usually be powered sufficiently by a phone, player, or laptop with a 3.5 mm output. Thanks to their 16-ohm impedance and 113 dB sensitivity, they are designed for direct connection to portable devices.Source:Specifications
What helps ensure a comfortable fit?
The Sennheiser CX 300 II weigh 13 g and come with silicone ear tips, allowing you to choose a fit that suits the shape of your ear canal. A snug yet comfortable fit is important not only for comfort: the bass and passive isolation depend on it.Source:Specifications
How do the Sennheiser CX 300 II sound?
The sound is perceived as rich, with noticeable bass and good volume. Users often praise the detail and isolation, but some owners find the high frequencies somewhat harsh—especially at high volume or with heavy music.Source:SpecificationsUser Reviews
How reliable are the Sennheiser CX 300 II?
Reliability depends on the individual unit and careful use: some owners have used them for years, but reviews regularly mention problems with the cable, splitter, and area near the plug. For a long service life, avoid pulling on the wire and store the headphones in a case.Source:SpecificationsUser Reviews
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