I've been slowly window shopping for my next IEM. I'm currently using my beloved Audio Technica IM03. This is the over-all sound signature I want in my upgrade, as well: Slightly bright and airy, while maintaining quite a bit of warmth and smoothness. Great soundstage. Natural tonality.
Reading this thread, the SM64 sounds like it fits very well in the IM03 category, though a tier above, yes? Even though they possess the same number of BA drivers. As they say, it's not the size that counts, but how you use it.
The greatest tips I've found for the IM03 are the JVC Spiral Dots. So far I haven't read anyone pairing them with the SM64. I'm quite sure they won't fit without some modification. But the core of some Comply foam ought to do the trick.
Anyone interested in trying for me?
I'm a few months off from making a purchase of this size. With my Christmas bonus, I'll likely upgrade my X5 to the Cayin N6. Then with tax return, I'll be ready for a new IEM. Quite likely, this lovely Earsonic. If I can wait that long.