You can have the sub reconed. basically they reinstall the VC, cone and put a new surround on it, Generally speaking it's not always cost effective, but if you had a HT using older drivers and one popped, reconing is nice option to have.
There may be a place local to you that can get the driver reconed. I was quoted $60 to recone my Clarion Pro Audio X2 a while back. I was all for it until they informed me they would be replacing the shiny purple cone with a black paper one.
