Graphs are quite limited, in my opinion. They do not tell about the resolution, response time, etc.
**** is more comparable to CCA10 and KZ ZSN, in my limited judgement.
**** is a real fun. A bit on a wild side for me. For instance, the sound stage feels huge. Then if you listen to recordings of piano or piano duet, the sound is all over the place three-dimensionally
Fun and wild.
The sonic signature, in my limited guess, is dominated by a nozzle-placed BA, and I would be extremely curious to understand what is the actual contribution of the high-impedance piezo, if someone can test with a disconnected one for comparison.