Thanks for answering, and how did I miss that?
My Aud-6x'es arrived today. Initial impressions are extremely favorable so far. No fit issues that I can detect, no harsh treble, no channel imbalances.
My first thoughts, sound-wise, are that they're a lot like a more technically proficient version of my GR07s, although somewhat bassier as well, which makes me wonder about that description of them as "neutral reference monitors". Not that I'm complaining.
I will admit that I was a bit pissed to have almost $700 IEMs sent back to me in a tiny, uninsured, First Class box, no case included, packed in a ziploc with some bubblewrap around it (almost as if he was expecting me to send them back again).
That aside, quite pleased so far, at least in this first hour with them.
Thanks for sharing. From my experience, custom IEMs can convey quite a bit of bass due to the superior seal and bone conduction. Is the 6X more bass heavy even with tracks that have light bass, or just with heavy bass tracks?
The bottom line is how they sound and perform for you...will you be happy with them in a month, 3, and 6? Let's hope they work for you and last you as long as you want them to.