How can I repair the front speakers?

I'd like to ask if anyone have experience vibration sound in the front jbl charge 3 speaker? I've try to fix the speakers by soldering the wire back to the terminal and I add some gorilla glue to the terminal wire that goes back to the cone. I found gorilla glue disappointed. I rather use a more elastic soft glue.

unfortunately I didn't solve the problem. On high level volume, the speakers don't sound anymore clear and clean as it used to be. Any suggestions? Thanks for your time an for your help