LAB SlapBox™ 1.30 ft^3 Ported MDF Enclosure Box for Single Alpine 10" R-Series Subwoofer
Alpine SWR-1042D Type-R 10" subwoofer with dual 4-ohm voice coils at Crutchfield
Amazon.com: Alpine R-W10D2 Car Audio Type R Series Sub Dual 2 Ohm 2250W Peak 10" Subwoofer and HA-SWKD Dual Subwoofer Sub Box Install Kit : Electronics
Alpine S-W10D4 S-Series 10" subwoofer with dual 4-ohm voice coils - Breakers Stereo and Performance
Customer Reviews: Alpine R-W10D4 R-Series 10" subwoofer with dual 4-ohm voice coils at Crutchfield