I would be curious as to what it was, ie sound effect explosion that did the deed. ... You have to remember that these designs are older and done long before HT and digital cannons at 10 ft, That type of special effect LFE bass was not a consideration back in the early 80's.
... Did you see how much cone excursion you are getting?? You can get close to an 1 inch out of a 2245 so I would pop the grille cloth and see what is actually going on. You getting any pumping or offset of the woofer?? Is the woofer new or is it old?? You could have an offset spider depending on how the driver was stored.
Rob