Amazon.com: LAB SlapBox Ported/Vented MDF Sub Woofer Enclosure Box for Sundown Audio SA-Series Car Subwoofer(s) | ¾ Premium MDF Construction | Made in U.S.A. (Dual 8" SA-Series) : Electronics
CT Sounds Dual 10 Inch Vented Subwoofer Box Design
Dual 8" Subwoofer port layouts: is one better than the other? : r/diyaudio