Alpine R-W12D2 12" Dual 2 OHM Type-R 2250W Pro Loud Subwoofer Speaker Sub - Walmart.com
Amazon.com: Alpine R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 2250W Peak 12" Subwoofer and HA-SWKD Dual Subwoofer Sub Box Install Kit : Electronics
Alpine R-W12D4 12 inch 2250W Audio Subwoofer for sale online | eBay
Alpine SWR-1222D Type-R 12" subwoofer with dual 2-ohm voice coils at Crutchfield
Alpine Type R 12' SWR1243D Subwoofer | eBay
Single alpine type r 12" ripping car apart - YouTube