New Kartesian very large xMax Woofer

This woofer most definitely has shorting rings, look at the description as well as the inner structure.

Check this:
img_5_23.jpg


Also don't know why you say that the bandwith is limited?
https://www.kartesian-acoustic.com/copie-de-wom185-vki
(no this link does not go to the WOM, but to the Sub, kinda confusing, I know)
View attachment 1248787
Edit: updated graph, they have the wrong one on their website, that is very very confusing.

I'm talking about Sub180_vMS. Not the _VKI drivers.
"We recommend to use this driver to cover the bandwidth 30 – 700Hz (-3dB)"