If its not to big find a neostick or similar sintetic glue,piece of medicine bandage and black (if speaker is black) mat spray.First put some glue around the rip wait for 10 min and then put the bandage on it.After that again 10 min of waiting and new layer of glue on the bandage.Let it 24 hours for glue to dry an then respray it.If you can do it from the back side its better and repair is almost invisible.
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