Sennheiser CX 275S Review

Sennheiser CX 275s Earphones
Sennheiser CX 275s Earphones Logo
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Reader Rating110 Votes
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The Sennheiser CX 275S In-ear Headset has been out for a while now but the model has continued to attract interest from consumers. We’ll have a look at the headset and see how it stacks up against other models at the same price point. The CX 275S is a pretty standard set of earphones with an included in-line microphone and a single-button remote. For the next model up, check out the Sennheiser CX 281 review.

Thin cable raises durability concerns

The headset has a 1.2 m cable, with the microphone and remote located on the cable leading to the earpiece. The headset has a plastic and rubber build. The cable is prone to tangling and also a little on the thin side. Durability can be an issue as a result, so if your earphones get rough treatment this is probably not the model for you. Sennheiser offer a two-year international warranty on the product.

Sennheiser CX 275s Earphones
Sennheiser CX 275s Earphones Inline Controls

The Sennheiser CX 275S ships with a short adaptor cable. Some devices are not compatible with the standard cable jack so the adaptor helps resolve this issue. The standard jack is straight while the adaptor is L-shaped. Both are sized at 3.5mm. Sennheiser state that the headset is compatible with

“virtually all major smartphone and tablet brands”

Amazon even claims it has

“universal compatibility”

You should take this with a grain of salt however. There are definitely some devices for which the headset is not compatible. Android devices seem more likely to run into this issue than iOS devices. It’s worth checking on the Sennheiser compatibility listing before committing to buying the headset.

Sennheiser Cable Adaptor
Sennheiser Cable Adaptor

Sennheiser CX 275S feature set

Included in the package is a storage pouch and three sets of ear adaptor sets. The ear adaptors come in the following sizes: Small, medium and large. Picking the right set for your ears will help maximise the passive noise isolation offered by the design. The storage pouch is a nice addition that keeps the headset from tangling or getting knocked around. However it’s not going to provide the same level of protection of a hard or padded case. The pouch has drawstrings, which is better than the annoying open-topped pouches you get with some of the other Sennheiser CX earphones.

Sennheiser CX 275s Earphones
Sennheiser CX 275s Earphones Accessories

The single remote button allows you to play and pause tracks as well as answer and terminate calls. Sennheiser did not include volume controls, possibly to maximise the number of compatible devices. Later models in the CX line abandoned this approach and the company instead offer two versions of the newer headsets: iOS and Android. I think that’s a smarter way of going about things. The Sennheiser CX 3.00i ($54.95) and CX 5.00G ($64.00) both were designed this way. Unless you have two devices from different manufacturers for which you wish to use a single headset for, you are probably better off buying a headset designed for your device’s operating system.

Related: Sennheiser CX 5.00G Earphones Review

Respectable audio performance

Sennheiser CX 275s Earphones
Sennheiser CX 275s Earphones Side On

The CX 275S has a frequency response of 17 – 23000 Hz and an impedance of 16 Ω. The company state the earphones have bass-driven stereo sound, which is accurate. They are more on the balanced side than some of the other earphones in the CX line, although the bass definitely has a bit of a boost. The midrange is clear and the treble is fairly pleasant. They aren’t audiophile quality earphones but they perform respectably for the price-point. The microphone also performs well during calls.

Not the best Sennheiser has to offer

Sennheiser CX 275s Earphones
Sennheiser CX 275s Earphone Tips

The Sennheiser CX 275S isn’t a terrible product although it does fall down in several areas. Sennheiser got the audio and microphone set-up right. However the headset is not very durable and the lack of volume controls on the remote definitely bring it down a peg or two. At $58.33 it’s not a bargain either and there are better products on the market these days. If you like Sennheiser you could do well with the CX 3.00i or CX 5.00G. Both have mic and inline remote with volume controls. The CX 3.00i is cheaper than the CX 275S, while the CX 5.00G is only around $6 more expensive. The only reason I’d choose the CX 275S over those models is if you don’t require a volume control, or you want to use a single headset for devices with different operating systems.


  • Impedance: 16 Ω
  • Connector: 3.5mm plug, 4 pole
  • Frequency response (microphone): 100 – 10.000 Hz
  • Frequency response (headphones): 17 – 23000 Hz
  • Sound pressure level (SPL): 121 dB
  • Ear coupling: In-ear
  • Cable length: 1.2 m
  • Transducer principle: Dynamic, closed
  • Weight: 15 g
  • Pick-up pattern: Omni-directional
  • Sensitivity: -44 dB
Sennheiser CX 275s Earphones
Sennheiser CX 275S In-ear Headset
The Sennheiser CX 275S offers good audio performance, although it has a fragile build and does not include volume controls.
Sound quality
Worth it?
Reader Rating110 Votes
Audio quality is respectable
Microphone performs well
Compatible with both iOS and Android
Pouch design is better than some other Sennheiser models
No volume controls
Fragile and tangle-prone cable
Compatibility is not as universal as Sennheiser claim
Cheaper Sennheiser models have better feature sets
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