It's a 1" baffle vs. the 1.5" on the Model T.

The Model T has a wider front baffle due to the 8" woofers. That extra width and the size of the woofers likely necessitated the extra half inch for improved stiffness.

Double-thick front baffle sure looks great in marketing literature. I'd love to see the science that led to the selection of front baffle thickness. I'd like to think science was done but maybe not. Maybe it was purely experience-based.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated