After losing one of my earbuds for my Sony MDR XB20 earhones, decided to but these replacements. The whole point of getting a deep rich sound is having a good seal with the earbuds, the rubber in these isnt such a high quality so you do get a lot of bass loss. Theyre ok for a quick fix, but if you enjoy the great sound from these superb earphones, I would try and look for the manufacturers own.