Not familiar with the FAD heaven. The W4 is good but it might have a little too much mid-bass if you want neutral, and there's not much treble sparkle. The SM64 is closer than the W4 to what you're after. It's definitely not a neutral earphone but it seems like it would be a good fit. It has more sub-bass than a strictly accurate earphone but overall the bass is not intrusive. There's an upper midrange dip, but the vocals are not dull as they can be with the UE900. The SE535 would also be good except for the lack of treble sparkle.
Thanks Joker. How does the SM64 perform unamped straight through an mp3 player, since the impedance on these are quite high. I have tried the SM3 briefly before and the thing that bothered me the most about them is the lack of clarity in the mids due to the note thickness. Does the SM64 have the same issues?
I have the CK100 at the moment as my main iem. From reading the review the Se535 sounds quite similar to the CK100's since they both have forward mids, light bass and an intimate soundstage.
Edited by Love Music - 10/28/13 at 8:27am