Boy...that would bother me. There are fixes, but all are compromised. I'd get a new tweeter.....you might want to ask B&W if they can recone/repair yours. I know Vandersteen does on their products.
Tweeter cone on my B&W 805 Naut's is pushed in
I bought these used and the buyer didn't indicate that one of the tweeter cones (not the grill) was pushed in. It isn't broken or torn, but clearly somebody touched it and pushed it in. My question is how significant is this damage. The speakers sound good, but I can't imagine that this isn't causing some loss of performance.