In terms of sound quality available on the market simply nothing like it in the price range under 150. The compact in-ear headphones deliver a crystal clear sound while a deep, booming but clean bass, as I never expected him at such small earrings. Of course, it also depends on personal taste, whether it is too much bass or not, but that can easily be adjusted by an equalizer.
As for mid and high frequencies, the plugs have a clear sound without height oversubscription. The CX 400-II are also extremely hard level, even loudest input signals they do not distort the sound. Particularly well the two earphones in uncompressed formats such as audio CDs and WAV files, FLAC or MP3 files feel at a bit rate of 192kbit beyond / s. Here at a reasonably trained ear a difference is really audible, because the little ones are able to reproduce even the finest nuances yet. This is especially in classical music, but also in other styles, clearly (I hear passionate Metallica;)).
To use the volume control on the headphone cord must be said that the simple sliding mechanism can move very facilitated consistently, and it may lead under certain circumstances to inadvertent Laustärkeveränderungen, if you go for example jogging, and the regulator from the ups and downs of the sweater while running is adjusted. Here a piece of scotch tape works wonders ...
Supplied with a nice leather case, a clip for fastening the cable are included in the clothes and several pairs of different sized silicone essays. The latter provide fit in almost any ear and can also be removed again for cleaning.
In addition, Sennheiser puts a hard rubber utensil to in the two ear plugs can be plugged in, while the cable winding around the part and can be fixed in an appropriate incision. This eliminates the annoying at reuse untie the cable. However, because the string must be very tightly wound, I see on this method in order to provoke no wire breaks.
I put both earbuds in, wrap the cable loose and loop the end of the cable two or three times around the wound part. The whole comes into leather, e viola: Lightweight untie, no extreme curling of the cable and no wire breaks.
Finally, let me say that the two wires for the left and right ears are of equal length. Thus, the right string can not bring them also behind the head, as with many other earphones, so that the in-ears may könnnen rather slip out of the ear in tension. However, can the balance by the adjustable silicone essays mostly so that the plug then tight enough to withstand even a Sprint can ...