I recently got caught in the rain with only a bikini top on my 4dr wrangler unlimited. It was parked and the rain mostly came in on the drivers side. I pulled plugs and dried out carpet etc. I now have an issue with my front left speaker going in/out. It seems to come back if I turn up the sound most of the times. It has been a week or two and still having problems.

 

Have you tried checking the terminals at the speaker to see if they are loose or corroded? That would be any easy start.

 

Checked all connections and it seems to be on the back of the mygig off the lockpick plug and play harness. Hopefully they will replace.