Those cone covers are important because they distribute the audio of the driver over a wider range. The defect will not cause further troubles nor will it get worse. Most people are capable of repairing them yourself. If you lost the old cone a replacement is necessary. You will need preferably the part number off the back of the speaker to get a replacement. Carefully measuring the diameter of the cone according to where the old glue shows it was attached will also get you the part. Just use Elmer's White glue to reattach. It get's tacky after a few minutes and the cone should sit there and dry for a few hours after replacement. Check for speaker repair parts online. You will find bunches of suppliers.
Zashiban
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