I have these headphones for several months, the inclusion of these headphones is admittedly difficult, especially for people with narrow ear canal as in my case, I have plenty of time to find a posistion satisfesante succeed because the foam are quite Paisses but once this course pass these headphones are very impressive, hard to believe that such small earphones can have as good sound quality especially for this price. They come down very low frquence allowing them to return deep bass, the sound is quite balance. They are perfect for an MP3 player, you will not be around by the sounds between ranges, but by their low impedance they saturate slightly on powerful headphone outputs such as headphone amplifiers if they are growing very high volume of all same. At that price, worth ca, it is almost given.