i just got my jbl l65as home and im doing some cosmetic cleaning of the cabs ant watco oiling them and i have a question. i believe they are the a series which appears on the foilcals but a b is stamped into the foilcal after the serial number and the a appears on the foilcal just like the serial # the woofer is a 129h and the crossover is located on the bottom of the cab (inside ofcourse). my question is i know the jubal has the 128h woofer is it possoble to just swap the 129h out and put the 128h in without doing anything to the crossovers? thanx brad