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
Alpine Type R 10 subwoofer 1000w peak SW R-1021D Used Tested | eBay
Alpine KTE-10G grille for 10" Type-R and Type-S subwoofers
Amazon.com: Alpine R-W10D4, R Series Dual 4 Ohm Voice Coil 2250 Watts Subwoofer, 10" : Electronics
Alpine SWR-1242D Type-R 12" subwoofer with dual 4-ohm voice coils at Crutchfield