Kind of lost on what you trying to do with the Jensen inside, but I believe I have good answers for your questions on Sound bar & speakers.
You didn't say what size TV, but I bought the 36" Vizio It is Outstanding!!! If you patient the price may drop down to $99 or just buy an open box from Best Buy. Connect it to HDMI Arc and you are in business, plus you will have Bluetooth outside for music. What makes this Soundbar so great is that it has built in sub woofer and you can feel and hear the base if you adjust it.
https://www.bestbuy.com/site/vizio-m...?skuId=6416783
As far as the speakers go. I recently replaced two Jensen 12w speakers that were inside with Alpine Type E 5.25" 2-Way Coaxial Speaker System, 200 Watts (SPE-5000) and it was incredible the difference in sound and quality for about $60. Note: the two Jensen speakers inside were the Winnebago waterproof version? My replacement Alpine speakers are not waterproof but they don't need to be. If I were to replace the 2 outside, I would just get the equivalent Alpine waterproof version, about $80.
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