Subwoofer Box Alpine Type R SWR-1242D | Ported Box | Slot
Amazon.com: Alpine ALP19-R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 1500W Peak 12" Subwoofer : Electronics
Alpine RS-W12D4 R-Series shallow-mount 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Alpine - SWR-1023D Type-R Subwoofers
Amazon.com: Alpine ALP19-R-W12D2x2wKit Car Audio Type R Dual 2 Ohm 1500 Watt 12" Subwoofers with Sub Install Kit and HA-SWKD Dual Sub Box Install Kit - 16 Screws and Speaker Wire with