Well, after one week with my FIBAE3, I'm at a loss somehow...
I don't know if my expectations are "false" but after reading a lot about the sound signature of the FIBAE3 being the brightest of all Custom Art CIEMS and everything about
and
I'm asking myself if my ears are shot.
For me, coming from some hybrid IEMs and listening a lot with my Sony MDR-1A, the sound signature of the FIBAE3 is somewhat "veiled" and "muffled". The bass is gorgeous without questions! For me, this is plenty enough bass, which suprised me a lot. After reading a lot about BA-driven in ears, my biggest fear was that the bass would not match the sound of hybrid IEMs with their dynamic driver. Piotr also told me that the FIBAE3 has the least amount of bass compared to the other CIEMs. So the bass really is not a problem for me. I'm listening a lot to metal and especially shouted vocals and all the cymbals doesn't sound like I would expect them.
As you can see/read, I'm really struggeling... Maybe I should buy some Etymotic to see, what other sound signatures might sound like.
I think what you may be hearing is the lower-treble dip. This dip is so the IEM doesn't sound harsh or sibilant because of over-accentuation. I'd recommend you spend more time with them and report back after your brain adjusts to the signature more. I also own the MDR-1A and I find it extremely warm and mellow, so I'm not sure what's going on here.