So I got a nice package in the mail today :) A Concero HP came in today. I was thinking about selling my Anedio D1 as I never use it except for iems and I figure I could save some space with something smaller that's more suited for iems and that seemed to be the ticket. The FA-4 is not very picky with what it is connected to similar to most of the iems I have owned and really liked. It sounds great from my ZX1, X3 and now the Concero HP. I can't really remember how much I paid for the FA-4 but it seems like money well spent on such a nice iem. It is definitely a deviation in sound from the rest of my iems as the rest of them (UERM, JH13, V6 Stage) all are much closer to neutral although some closer than others. The FA-4 is definitely more of a "fun" iem but it is also meant for stage use so it makes sense that the bass is more prominent.
It's a bit more forgiving than my customs but not by much. It sounds very good from my flac files that are mixed well but if I play something that's brickwalled it doesn't sound as good. On another note I need to stop buying iems and buy more cds and stuff from hdtracks and the like.