You can treat the cone itself with Kiwi Wet-Pruf.
The cones should be stiff anyway.
I know several large manufacturers of PA gear use this to make their systems "weather resistant."
Where you need to be careful is around the flexible perimeter.
Depending upon what technique the speaker uses for that area, you might be able to treat it and you might not.
Cheers,
Steve
My girls:
Isleen - 2014 F6BD
Saorla - 1995 FLSTN Heritage Special
"Politeness, n: The most acceptable hypocrisy."
Ambrose Bierce
Impressive work all. I'm very happy with my setup although next year I may upgrade the sub solution. I have a brand new "drop in" set of j&m series 2 speakers for sale if you want an upgrade without requiring an amp.
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