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I'm curious about this too Rowle. I'm about to undertake a upgrade to my 2015 Ultra Limited as I plan to put Kappa Infinity's in my rear pods and notice that there is a lot of exposed circuity around the tweeter underside near the gain switch.
The Kappas are not waterproof but they hold up well to the elements. They are one of the forum favorites and I can't recall any reports of failure because they got wet.
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