Alpine SWS-1223D Type-S 12" subwoofer with dual 2-ohm voice coils at Crutchfield
Alpine 12 Inch Type-R Subwoofer (R-W12D2) | SK Customs Car Audio & Home Theater | Atlanta | Norcross | Duluth | John's Creek
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