I have a single DIY box that I did that holds (4)6.5" and (2)8" so the box is pretty big. I use (2) 48gal trash bags, place one on each side so they meet in the middle and then use bungie cords to hold them in place. Not completely water tight but it serves it's purpose. I am like you, if they last a season, I am happy. May have a total of $200 in the box and speakers.
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