I buy to try the follow earphone : Koss KSC9 , which be earphone with clip over the ear , Koss ksc22 which be with clip over the ear as well . I want the clip so that the earphone would not fall out from my ear so easely , and these two model do not fall from the ear no matter what you do . but the sound quality be depend at the way you will insert they to you ear . but Sony MDR ed21lp be a surprise to I : not only they fit so well in my ear , they will hold they selve very nicely within the ear -lrb- maybe after some time you will need to push\/fit they in a little , but even without do so , they will not fall out -rrb- and they sound much better because they be act like internal earbud , without be force and seal inside the ear canal , which be very un healthy for the ear . this Sony model do the trick very well , they fit very nice , quickly and locate they selve in the optimal way in the ear cavity , and they have this special rubber part that be gently insert into the ear canal , but without the pressure of the tight seal , so you get a surprising louder bass then any of the earphone model that do not have this aditional `` sound tube '' . I be a musician and I can tell very well if the sound be even slightly better . I be go to get I another set of these so well sound earphone . the sound be balance all across . I like to hear a good bass sound and this Sony model give I the best joy of listen so far with these size of earphone . -lrb- my mother tang in not english , so please forgive I if there be any mistake -rrb- .