maybe you can replace those
Tweeters have wide range,seems plausible you could find a decent match,yes x/over is set too match the particuler tweeter!
I have a pair of 20/20 near field monitors 1-8" x a 1" softdome tweeter from partsexpress and it sounded great after replacing it with a titainium tweeter,yes its a no no tinkering, to some its debotchery or just wrong,but you cant even play those at all right?????
Those are fine spkrs though,the company would be helpful i hope first!
PULL THAT tweeter too get some info i guess!
Good luck on the fixing, somehow!!