Hello, Yes this can be easily repaired- you will need to replace the tweeter diaphram, or the entire horn driver (both of which attach with screws, but the horn driver is easier to replace). In order to do this, EV uses the part number on the horn driver itself- so I would need you to remove the horn, and pull the part number off of the back of the horn driver to assist further.
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You can also contact Encompass Parts directly below and they'll get you what you need: