I rebuilt a pair of those for a cutomer last year. The new surrounds will need a good break-in period before the woofers reach their full potential. Those are quality JBL Woofers and nothing to sneeze at. I also rebuilt his crossovers, as they were mostly NP Electrolytics. I used Sonicaps and Daytons. Compared with my 2As, the bass and mids were good, although my 2As now go lower, but that Titanium Dome was excruciating to listen to. I even suggested replacing it with a some Vifa Textile Domes, but he was happy with them they way they were. The customer's always right.
BTW, I have the schematics for them if you're interested.