In that DIY scenario, if one will go with a proper ported design, the JL 12 or 13 inch W7 drivers can hit those teens at ultra high SPLs, no problem.

It is amazing they can produce the SPLs they can in the mid to high 20's in sealed cabinets. A true testament to the 1st class motor design, that despite being over a decade old, is still among the best performance available.
It will be exciting to see what new flagship design JL audio will eventually release.
-Chris