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Ported upfiring box


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I have a 03 sierra 1500 ext cab and i'm planning on installing 2 alpine type s 10" in separate enclosures under my back seat. I don't remember the measurements exactly but it's something like 21 x 15 x 7. my sub wants at least .74 cu ft of airspace in a ported enclosure but performs best at 1.4 cu ft. Do you have any suggestions? I've also bought some poly-fill to staple to the walls

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