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Spray in foam insulation is the way to go because it covers everything and acts as it's own air gap (foam has small bubbles) which improves efficiency over pink fiberglass or rigid foam board. It will cost more to apply per sq. ft. but will re-coop the difference in short order. I can't speak on your other topics, but may suggest looking at marine applications that are meant for tough weather conditions for your outdoor sound system.
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