In article ,
David Platt wrote:

Really, this latter feels like your best bet... it claims to be
exactly what you need. If it works, you've got your original speaker
system restored to life and original quality in an afternoon. If it
fails, you aren't out a lot of $$ and can still pursue the idea of
replacing the drivers.

And, if you don't care for the risk of doing the work yourself, they
seem to offer a repair service. Take out the drivers, ship 'em, and
for $44 each they will replace the surrounds and gasket themselves,
test the drivers, and give you a 7-year warranty on the work.

http://www.simplyspeakers.com/infini...er-repair.html

That's still gonna be cheaper than replacing the woofers with anything
of decent quality.