I've been listening to the Percivali off and on for the last 18 hours or so and honestly I'm struggling with it a wee bit. On the one hand at times it's as good as anything I've ever heard. At its best the sound is lush, full, vivid, grand & clear with the midrange in general possessing in full what I would refer to as "Oriolus magic". On Carmannah's Long Way Home the vocals are angelic & enticing and up there with something like Elysium & Traillii. Often though the upper mids and highs become too much for me overwhelm a wee bit and dominate the whole scene making me totally oblivious to the bass or really anything below about 1K-- and, unlike with the Reborn, this doesn't seem to be something easily fixable with EQ. Lower mids on Perci are less satisfying on the whole-- something like Dire Straits In the Gallery lacks the body & weight that I'm used to with my other IEMs. Bass on these is something of a mystery to me. It's certainly there but it lacks the oopmh, presence & definition that I hear on Reborn & Isabellae.
This is perhaps the most interesting comparison. I often use the terms "Eastern" vs "Western" tuning to describe differences in how the bass & mids are presented and emphasized. In this light Perci seems to be basically an Elysium with a more "Eastern" FR (ie., more of a sub-bass & upper mid emphasis.
This to me is another interesting comparison. It seems that Perci has more sub & lower bass presence but that's not how I hear it-- in Perci the bass often gets lost in the mix to my ears so it feels like I'm awash in the upper mids & highs with the bass coming from a across the street or somewhere else. On Isa everything to my ears is where it should be and I'm always conscious of the entirety of the signature when listening to it.
This I also found very fascinating as it somewhat confirms my feeling that Isa is in many ways a mini-Elysium with different emphasis only in the highs.
The bottom line for me will be to echo some comments made by
@ranfan earlier. Perci has shades of greatness-- and often. Within its sound I hear flavors of all the other Oriolus IEMs I've heard (Traillii, Reborn & Isabellae) however in each of those other 3 IEMs I feel they were able to produce a more cohesive & coherent sound. With Perci I feel they struggled a bit to integrate the 3 different driver types so that sometimes, especially with the bass, it feels like I'm listening to two different IEMs at the same time and on the whole the signature, while great in parts often fails to manifest as a unity. The verdict for me at this point is that the Percivali strives for and often attains greatness but it's ultimately not my ideal FR and I feel it lacks the polished perfection of my favorite Oriolus IEMs. As with everything, YMMV.
Edit: I'm also not really a fan of these massive shielded cables. It feels like I'm draping a python over my neck when I put them on. Also, what's that little 3.5 dingus for that sticks out the end of the cable? Never seen that before.