What is the most flat compression driver of 2024! (520Hz - 20+KHz)

greetings !
I'm posting this topic on this forum hoping that the subject doesn't spill over 🙏🏻

I am doing purely intellectual research which has no specific goal other than knowing it, I would like to be able to have the name of the hf\coaxial compression driver
as flat as possible with innovative technologies whether on the phase whether on the dispersion or other

My stone in the building only has the 4590 of BMS
never seen such a smooth curve over such a large range, I am waiting for your documentation, link, on other compression driver
 

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