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The first item that needed building was the subwoofer box. We chose to use two Kicker 10-inch subwoofers (PN CVR10) and constructed the box from MDF (Medium Density Fiberboard), much like you'd use for trim around your house. Following Kicker's recommendations, the interior volume of the box should be 0.8 cubic feet for each speaker, so the box needs to be divided up so that each speaker has 0.8 cf. Be sure when you build a box it is air tight--it'll improve the sound tremendously and keep out the dreaded rattles.