This actually surprises me. I have read some few others offering the same thoughts regarding the treble on the CRA, but for the most part most people that I have read their thoughts about on these think the treble is really well done for a budget set. The thing is that not only do I find them not harsh at all, but I actually EQ the quantity of treble up a bit. I begin to wonder at what frequency you are referring to that seems to be the major spike on these?I've gotten my CCA CRAs to use with my CCA BTX, finally.
I'm impressed for the price, but they required quite a lot of EQ:ing in Wavelet to be listenable to me. That treble really hurts my ears, I actually have had a hard time EQ:ing them to a point where it's not either a) too sibilant or b) treble reduced to a point where it loses the sparkle up top way too much.
I thought they were going to be waaay to heavy with the bass right away, but that wasn't too bad in my opinion, it was just the treble that bothered me, especially the lower parts of the treble frequencies. I wish the vocals were a bit more in front as well, but it wasn't as recessed as I was worried it would be.
What I do enjoy is the separation and sound stage, seems better than most TWS's I've used.
I AM older, so I have a hard time hearing too much over 12k (it is there, but at a much lower volume than is normal), but anything under that I can hear just fine (I am especially intolerant to the presence region). Also, what sort of music are you listening to that actually gets sibilant for you (I do know they don't really like low quality music very much IMO)? I listen to pretty much everything, but metal (and its forms) is my go-to listening "druthers".
Also, have you listened to them wired and directly from a DAP/source? Or, are you possibly not getting a good fit with them? It isn't a huge deal for me, I am just curious when I do see comments about the treble being harsh on these, and only then because I find them to be quite the opposite IMHO?!
On another subject, how do you find the CCA BTX to be? Have you listened to it with any other IEMs? Until you mentioned it, I had not heard they had a BT adapter.