So I demoed these K10s last Sunday, it had custom-like aesthetics, with wooden faceplate and some designed shell, but the canal was universal, and the tips fit me perfectly although the canal was a little short.
The sound was sublime. The first thing that hit me was the impeccable coherency all the reviews were talking about, everything sounded seamless. The overall ambient was warm, bass was adequate, soundstage was above average, but the coherence and imaging were still the standout traits. After an hour or so, I concluded that the only 'weakness' was that the K10 made everything too 'smooth', this particularly showed in harder edge tracks like Rock and Metal, where all the 'attack' and 'edgy transitions' were smoothed over and sounded really polished and refined. This made audiophile recordings a dream but it did make me prefer my 846 for a truly brutal, head-bashing rock experience. Perhaps this had to do with the K10 being tuned as a chameleon, so the focus was not on being particularly 'rock and roll'.
However, I tried these both yesterday;
The K10U was up first, but it was disappointing and did not recreate the outstanding impressions I had from the previous demo. The warmth was gone, and the coherence was no longer startling good. I temporarily attributed this to the tips, the less than stellar fit, and maybe even the aluminum enclosure. Then I tried another 'custom aesthetics universal demo', which was supposed to give impressions of what a K10 CIEM sound like, and it was the worst of the 3, it was muddy, and every trait that appealed to me was gone. I was very confused and tried the K10U for a second time, and this time it was better.
So the question is: what could explain the discrepancy in all 3 demos? Theoretically they should all sound the same, but could the tips and enclosure material (aluminum vs all kinds of wood) have played a part in shaping the sound differently? Most importantly, if I were to get a custom / Prestige K10, will there be a high chance I can get the SQ from my first (and best) demo? Does the materials (carbon glass, wizard wood) factor into this?