Anything can be fixed, almost anything,
if the speakers were high dollar than repair'em, I'm still old school
when a decent set of speakers were high dollar, they still are if you
want real quality.
So fix them up like new and use them or put them back in the attic or
you might read up on acoustics and remove the speakers and put them in
the wall or ceiling.
google infinite baffle,
You'll find lots of information and parts available on the internet,
one of many....
http://www.speakerworks.com/speaker_..._kits_s/65.htm