Alpine SWR-1242D Type-R 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Insane Bass From Two 12" Alpine Type R (SWR12D4) Subwoofers!! - YouTube
Alpine SWR-1222D Type-R 12" subwoofer with dual 2-ohm voice coils at Crutchfield
Alpine Type-R 12" 1000W Subwoofer Black SWR-12D4 - Best Buy
Subwoofer Box Alpine Type R SWR-1242D | Ported Box | Slot
Alpine Type R 12" SWR-1242D Subwoofer | eBay
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
Single alpine type r 12" ripping car apart - YouTube