USA miles ahead in driver design?

Can you get the UM 18 to play all those lows and still make it all the way to the main speakers crossover point of ~90hz? Not drifted out of phase before meeting the front stage or mains like 90hz ?)

fb is ~16 Hz and the first void/ ugly peak is at 115hz or so with an offset driver MLTL?
Even though the Enclosure size is quite large, 350 liters) Flat to its <18hz😱
 

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