Noob here, I've been debating between 3 iem's, re0, eterna, and trifi. My taste for sound is very crisp and detailed highs , full mids ( the kind of mids that when a women sings it makes the hair stand up on the back of your neck. lol.) and bass that compliments the high spectrum of music, im not a bass head , but i do like bass that is efficient sounding( not boomy or bloated). I also love a big wide sound stage, where the music is all around you, but can be pinpointed in certain areas, kind of a 3 dimensional effect, or should i say theater system type audio transfer. I'm a retired dj who still loves top quality sounding music. Other than the three i have picked of interest i'm open to suggestions. my source is sansa fuze and a practical device xm4. thanks to all who reply.