Single alpine type r 12" ripping car apart - YouTube
Insane Bass From Two 12" Alpine Type R (SWR12D4) Subwoofers!! - YouTube
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 12 Inch Type-R Subwoofer (R-W12D2) | SK Customs Car Audio & Home Theater | Atlanta | Norcross | Duluth | John's Creek
Alpine Type-R SWR-12D2 12" 3000 Watt Dual 2-Ohm Car Audio Subwoofer Sub SWR12D2 | Audio Savings
Alpine R-W12D4 750W RMS 12" Type R-Series Dual 4-ohm Subwoofer
Alpine R-W12D2 12" Dual 2 OHM Type-R 2250W Pro Loud Subwoofer Speaker Sub - Walmart.com
Alpine SWR-1242D Type-R 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Alpine SWR-1242D Type-R 12" subwoofer with dual 4-ohm voice coils at Crutchfield