Your speakers can be repaired at the cost of one (or two) tweeter(s).
There will be no warrantee on your B&Ws.
In fact there is never any warrantee on any speaker (despite the high gloss add papers tell something different): The manufacturers exclude
- mechanical damage (e.g. if you stumble, fall into the cone and damage it- or a cat rapped your beloved transducers)
- electrical damage (if the voice coil burns/melts)
- ...and do you know any other damage that might happen? So you see...
No manufacturer will ever feel responsible for a damaged speaker!
Regards and good luck,
Jan