What I do in my car audio installs for my oun cars is this. I’ve tested it with a few on my porch and garage audio systems and it works great
I’m a master mechanic by trade and there is a jell type material that’s called dialectic grease
you put it on all your connectors and then you install them like you would normally
This stuff does not interfere with any of the current or signal going through that connector
So on an RCA cable you could put a little dab of the dialectic grease on the RCA cable and plug it into the Jack and that will make a water tight and atmospheric tight connection so that there will be no oxidation or moisture penetration getting into the plug
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