We've always carried a radio with us when camping and decided to add a permanent radio with remote and both indoor and outdoor speakers.  The radio is wired thru the gallery switch so power is shut off when the gallery is not up.  I've also wiring the speakers for the front being indoor and the rear being outdoor.  I can't find pictures of the radio right now but here is the outdoor rock speakers and connection added for them in the side of the camper.  I will add indoor picture when I find them.

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The speakers have a 20' cords so we can sit them by the campfire.  We always have the kids stand by the edge of the campsite and make sure it can't be heard throughout the CG.
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