I can see that if you're running certain types of gear you may have a concern. There have been solar storms historically which have been so violent that they caused telegraph machines to crackle, and when there is a CME with enough power a lot of damage can occur to the infrastructure. The telecommunications and energy provider industries seem to take the brunt of such solar events.
If you were not able to react quick enough and disconnect your devices you might lose a component related to internet\wireless operation; I can imagine a router or repeater getting fried. I have been told that a great deal of damage happens to such devices from solar events. It sounds like they are not terrifically robust, and can go bust easily.
Other than that I'm not sure that other audio gear would suffer permanent damage from it.
