I usually listen to ost,jazz and classic, I will also listen to the pop like u2 as well, I would like the good treble and mid on the iem. I tried the sm64,w4r,um3x and thunk the most I like is the sm64 Do you have any above or other recommendations on the iems (source will be unamped j3)

I would like to know that which player is suitable for Earsonics SM3V2, could I use SONY A866 for the SM3V2, besides, is the player alone enough for the earphone, or the AMP is needed for it.