Maybe you could pass on the request from many of us to make available a balanced connector similar to the SE cable but only terminated with a TRRS connector. That would make things about perfect!
I wrote to Flare Audio sharing your suggestion, HiFlight.
I'm having a meeting with someone from Head-Fi in a few days I'm very much looking forward to, where I'm bringing some of my equipment to share, including the FlaresPro. While I'm at the meeting, I'm going to try the FlaresPro on another source and compare it with another iem. If the fizz is still noticeable, it'll be all I really can do.
Again, I'm still really glad for this experience, as it hashelped reshape my sound signature preferences and outlook towards audio frequency graphs. Regarding the FlaresPro itself, I agree with many here who really like the item, as the FlaresPro is a very special Dynamic driver iem competing gloriously among the cesspool of the dreaded V-shaped iems.
No offense meant to people who like the V-shape sound, but my comment really is meant to show my dislike for that particular sound signature itself. Flare Audio really is daring to do with the FlaresPro what is so uncommon among Dynamic driver iems, and I must say that I'm very impressed by their effort in all ways, with the exception of the treble area.
I'm thinking perhaps there is a defect that is not present in all units of the FlaresPro. Another mention I haven't addressed regarding this, until now, as its taking me some time to think about a good enough term to describe the fitting of this effect, is that the fizz itself sounds like something of a "loose addition to the sound", in a way. It is as if something in the design is attaching itself to the tuning and amplifying the treble region in where specific vocals are being given that particular unwanted amplification. So while at first it may sound as if its the tuning itself, it may actually be something else in the build.
I'm not sure if that makes sense or not, but I've also mentioned how its not present in all music, which has me wondering if its directly the tuning, then certainly other music would have to be avoiding this completely and I'm not sure if that necessarily is true. So, what I'm thinking this could be from is one of Flare Audio's sound technologies that are used in the FlaresPro in one of the equipment structures that is defective in some units, which are effected by certain music, or perhaps triggered by volume, or even has its negative outcome lessened or enhanced depending on eartip placement/overall snugness, etc.
Basically something that mimics an overly-enhanced treble tuning, but is not that or even as I've suggested in the past being a differential where the extended upper treble bump is taken too far. Again, this isn't a typical sibilance issue, but rather an issue regarding sound static during parts of the sound where treble is sensitive and can produce static in the sound.
If Flare Audio can resolve this issue, as I believe they will, the FlaresPro without the issue will truly be an outstanding iem.