With the CX-300 a lot of the noise around you is blocked out, so you can listen to your music at a normal volume. Another fantastic thing about these earphones is that you can’t hear people people around you unless they were shouting. That is what these earphones were built to do.

Product Features

Includes – 1 CX300 ear-canal headphones and 1 Ear adapter set (S/M/L)
Powerful, bass-driven stereo sound
Perfect fit in the ear canal due to ear adapters in different sizes
Brilliant attenuation of ambient noise
Ideal for use with all MP3, CD, DVD, MD players and portable game systems with 3.5 mm headphone sockets
So who are these for let’s look at that:
1. Someone who wants to shut out surrounding noise while enjoying their music. 2. Someone who like excellent sound quality. 3. Someone who wants to listen to music but does not want to wear something that feels like a helment.
Let’s take a look at the cons

The cord that comes with these it is long on the right ear and shorter on the left. It is not too terrible but some people don’t like that shape.
Cord noise. These cords make a noise in the wind or against clothing, that you can hear and it sounds like a rustling sound.
You might have a small bit of distress getting the 3 different sizes of silicone ear pieces to fit. You can get a slightly larger size and it should work fine.

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Article Source: http://EzineArticles.com/?expert=Shannon_Garner

With MP3 players and other portable music devices becoming more and more common, the companies making earphones have also been busy at work making better and better models to enable people to delight in their music even more.

If you have bought a brand-new iPod or other MP3 player, the earphones that are included are often cheaply made models. This is to be expected with any free earphones; and the cheaper models usually don’t produce particularly excellent sound quality.

If  you’ve already invested quite a lot of money on the MP3 player, it’s a excellent thought to spend a small bit more purchasing  quality earphones to listen to your music through.  The Sennheiser CX300-B Earbuds produce some of the best quality audio of any earphones in their price range.

For the audiophiles among you, the main features boasted are:

They produce accurate tone throughout a wide frequency range.
They have a 112 dB sound pressure level, which means it’s simple to block out noise in the background and really delight in the music you are listening to.
Their bud shape means that they fit directly into the ear canal, again limiting background noise. A minor point about this is that when using them outside, it’s vital to take notice of your environment and not get hit by a car that you didn’t  hear coming!
They have a standard 3.5 mm plug, which means they are compatible with the vast majority of audio devices.

As the Sennheiser CX300 B Earbuds offer some of the greatest audio quality in their price range, when using them to play MP3s, it’s vital to give at least a small consideration to the “bitrate” of the file you are playing.

MP3 files contain compressed audio and the lower the bit rate is, the more data is lost (and hence the lower quality the audio is). To really get the most out of these earphones, it is a excellent thought to encode your MP3 files at least at 256 Kbps.

Really, for the price, the Sennheiser CX300 B Earbuds are some of the best in the range and by coupling them with excellent quality MP3 player you will experience music on the go in a way that you have never been able to before.