Focal P 20 FSE Flax Evo Series shallow-mount 8" 4-ohm component subwoofer at Crutchfield
Amazon.com: Pioneer TS-SW2002D2 8-inch Shallow-Mount Subwoofer with 600 Watts Max Power : Electronics
Amazon.com: Alphasonik AS8DF 8 inch 600 Watts 4-Ohm Down Fire Shallow Mount Flat Enclosed Sub woofer Slim Thin Loaded Subwoofer Air Tight Sealed Bass Enclosure : Electronics
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8" Dual High Output Glue it & Screw It Sub Enclosure. - GP Car Audio
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MESO-8 - 1600 Watt 8 Inch Car Subwoofer - CT Sounds – CT SOUNDS
Sealed MDF Enclosure For Flat 8-inch Subwoofer - Final Sale – Retro Manufacturing
Amazon.com: Alphasonik Dynamis DCP8 8 inch 1000 Watts 4-Ohm Shallow Mount Flat Enclosed Sub woofer in Ported Vented Box for Tight Spaces in Cars and Trucks, Slim Thin Loaded Subwoofer Custom Port