Alpine R2-W10D2 Subwoofer 25 cm (10-Zoll) R-Series 2250 Watt
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 SWS-1023D Type-S 10" subwoofer with dual 2-ohm voice coils at Crutchfield Canada