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Disappointing sound quality
After reading some reviews, I was excited to purchase these headphones because they sounded like a reasonable bargain. Unfortunately, they've proven to be quite disappointing.

The build quality is alright: the wire is light and soft and the drivers are soft too though I really can't get them to stay far enough into my ear to isolate and deliver the most sound they have to offer. Also, the wire is a bit too short for me: I can't put my player in my pocket and have the earbuds remain in my ears because there isn't enough chord and the earbuds get pulled out of my ears as soon as I move (I'm 6'2" and this is a pretty common problem with earbuds for me.)

The big disappointment was the sound quality. Bass was almost completely absent; there was only a tiny bit of impact but even that was minimal and the driver had to be quite far into the ear to hear it. I don't expect much from earbuds, given how small the drivers in them are, but these are far and away the least responsive on the low end that I've heard in quite some time. There's plenty of clear high and mid range sound there but it just didn't sound balanced at all to me and the highs sounded a bit more synthetic than say, the standard Apple iPod headphones.

I couldn't spend any significant time listening to the headphones, despite an effort to listen to them for an hour or two: after that, I was done.

Even my fiancee, who is typically pretty easy to satisfy with headphones, refuses to use them.

Excellent Earphones!!!!!!!
It took me a few tries to figure how to properly use these 'phones (You have to seal them deep in your ear, not just place them in there like the old iPod ones I was used to). But since I was able to figure them out, I have not been able to force myself to use those old iPod earphones - the sound quality is that much better. The attenuation of nearby noises is great. I can't hear a thing, even on a relatively low volume setting. The wire is different as it wraps around your neck but that just takes some adjusting and is not a big deal. I love Sennheiser products and have stuck to them when it comes to buying new headphones (I currently own three different pairs). These CX300-B are great value for the money () and you will not be disappointed.

Don't know about these other people but....
Personally, I find these to be an amazing set of earbuds. So much so, that I am actually writing my first Amazon review. After seeing all the reviews about horrible sound, I think those are just people that unluckily got a fake set. Which really, we can't even blame Amazon for, as they are at the mercy of the suppliers they buy from, who could have been duped as well. Either way, easy way to find out, is pull off the silicone earpiece, and look at the mesh screen. If it is on the outside they are fake, on the inside is real. Only reason I gave them a 4 rather than a 5, is I hate the cord.

falls out
I cannot keep the buds in my ears. Freguent changes of the bud covers does not help. Other than that, sound is good with my Sony am/fm portable radio.

Amazing while sitting, not for working out
I have owned many pairs of headphones and earbuds over the years, and these are without questions one of the best. When you are sitting down at your desk, on the subway, or just walking down the street, these are essentially the best headphones you can get. The sound is crisp, and the bass response is very impressive. They are only right now on Amazon with free shipping, and I would honestly say I would buy them for 4x that!

I can't recommend them in the car, as they effectively cut out almost ALL outside sound. At the office I can't hear any phones or people around me, with the music not very loud at all. I haven't tried them on a plane, but I imagine they would be extremely good at blocking out the outside noise. As they aren't officially sound-reducing, if you can still hear the outside rumble a little bit, you can't complain.

The only quality of these earbuds that isn't perfect is trying to use them while working out. I love the y-shape wire, which is perfect for running down your left side. However, when you are working out, and the cord is bouncing around, every time it knocks against something it reverberates inside your ear for a loud and annoying popping sound. After reading other reviews of this product, I would have to agree that it is annoying but you can ignore it if you aren't bouncing around too much. Other than that: best earbuds I've ever used, especially if you like completely blocking out the outside world.