The Shure SE215SPE is a special edition release version of the SE215 models. Unlike the regular SE215 which come in black or clear, these special editions come in translucent blue and were only available for limited time in Japan. I managed to buy a pair of these on Amazon and I am simply blown away by the sound quality of these earphones. I managed to get a hold of regular SE215 to compare and there is a noticeable difference. The special edition blues have a considerable enhanced low end boost over the regulars. I am a bass lover and these sound perfect to me! You get just enough bass without it becoming too overpowering and muddy like Beats by Dre. All in all these earphones are PERFECT!