Sennheiser CX150 Ear-Canal Phones

General Information

- Finger-contoured design of ear-canal phones allows for easy adjustment and optimal wearing comfort
- Bass-driven stereo sound with good attenuation of ambient noise

Frequency Response: 20-20,000 Hz
Cable Length: 1.2 meters
Impedance: 16 ohms
Sound Pressure Level: 110db

Latest reviews

Pros: Punchy Bass (especially for a pair of low-grade IEM's), Relatively comfortable, handle vocals very well
Cons: Incredibly microphonic cable, cable also very prone to tangling, tips tend to fall off


The easiest way to explain the Sennheiser CX-150's is that they do what you can reasonably expect. You can't really expect much from a pair of sub-50 dollar IEM's, and frankly, I was pleasantly surprised by the general quality of the CX150's. The sound quality is fine enough for portable listening from an iPod, as I use them, and I have yet to hear anything less than serviceable come from these IEM's. They're relatively comfortable, but the microphonic cable can get quite annoying at times. I tend to keep the cable under my jacket so as to avoid excess movement, but during summer, I can see this being an issue. 

Comfort / Design

They're marketed as "twist-to-fit," and I still have yet to understand what that means (you can insert them just as readily as you can any other pair of IEM's). Comfort is a big issue of mine with IEM's, as I find it hard to find IEM's that stay in my ears readily. The CX150's don't disappoint, as I've found them very comfortable and stable in my ears. The biggest con here is the cable, the IEM's themselves are fine. The cable is clearly made out of relatively cheap plastic: very stretchy, microphonic, and prone to tangling. I've had no issues with the connectors to the jack or the drivers, though. The cable is fastened very securely to the respective ends. 

Sound Quality

Again, the CX150's do their job. Don't expect premium sound from these, as many would consider them near-disposable. That being said, I'm still very surprised at how generally good they sound.


The bass is really where the CX150's shine. I've not heard a cheap pair of IEM's such as this that do as good a job with the lower regions as these. The bass is punchy and powerful, but never really overwhelming. This may be personal preference, especially as I listen to a lot of Electronica (especially Electro House and other bass-heavy genres), but I never feel too put-upon by the lower regions, when using these phones.


The mids are nothing to really write home about; the mid-region is perfectly adequate (exceedingly average, as someone else put it). Vocals (male, especially) really do come out in clarity, though. Even with full instrumentation, one can still hear the vocals over it all.


The highs are really where you can tell that these are cheap phones. In Shostakovich's Sting Quartet No. 8, one of my favorite pieces, the upper register of the Violin is slightly distorted, and almost painful to listen to. It's supposed to sound very eerie and dissonant, yes, but on higher quality phones, you still gain a sense of warmth that is not found in the CX150's. 


These are a perfectly serviceable pair of headphones if you listen to anything that doesn't have prominence in the upper register. Don't get me wrong, the highs are listenable, but only barely. I recommend these to anyone who listens to bass-heavy music and is looking for a pair of cheap headphones that'll do their portable MP3 players justice.
I really liked these too! I had the CX400 when I picked the CX150 up for about $15 on a deal at Fry's in downtown Boston and was PISSED that I had spent like $80 on the CX400s. I don't think I could go back now, owning the UM3X and having had and auditioned a bunch of other top tier universals, but the CX150 never really disappointed me in any outstanding way.
They are on NewEgg for $15 right now, easy recommendation for anyone who wants a better quality earphone than what they can buy at RadioShack for $50+; I think they will probably compete with the Apple Earpods.
ixnay on the link, guess they are out...
Pros: bassy, great quality, very solid build
Cons: i had two pairs that broke after a while, gave up on them
I bought these at a closing sale for $20 and they were definitely worth the money. The bass is excellent for bassheads on the go and the sound isolation is excellent for noisy areas like bus rides. They are pretty comfortable and are easy to fit because of the shape. They're also pretty loud at low volume and with a proper rig you can get some serious bass out of them. 
The bass is what really grabs your attention when you get these. That's what dragged me into buying them when it said "bass driven sound" on the box. You can feel the lows without it getting muddy and they hit pretty hard. I mainly used these for hip hop, rap, dubstep and classical music. They just weren't right for rock and metal for me.
The noise isolaton is very good. As long as you're playing music you will have almost no problem with hearing your environment. The only downside is wind. On a windy day you will hearing wind whirling past your ears. I generally use these for bus rides and I could barely hear the sound of the bus or the people around me. 
The fit is very nice. They just about never slipped out of my ears. The comfort is also good. You can wear these for a pretty long sessions before getting tired of them. The shape allows you to adjust them and push them in any time with just one hand. 
The soundstage is amazing. You can get different combinations of sounds coming from just about everywhere. 
The cord is very thick and feels protective of the inside wiring. It also helps untangle easily.
And now for the cons.
There isn't really much that's bad about them, they sound very good and show the quality of Sennheiser. One bad thing I've found is that there isn't some type of slider or case that comes with them, so I really don't have a place to put them or keep them protected. Another thing is that some people have had problems with is the loss of balance between the left and right. I've had this problem twice, once with the right and another time with the left, and now I've given up on them because I don't think they're worth repairing or sending back to Sennheiser just to get another pair, in fear of having the problem occur again.


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