not but i've never seen a spider with a problem like this..! i have always played with an eye on woofers..!
if they have made too much xmax they should have broken in a ring...!
xcuse for my english, i'm italian
i have just reconed 2 fi btls and i have seen these cracks on the first spider..
some people told me that happen for too much xmax, because i have played under tuning freq.. never seen this problem before?