Alpine Type-R SWR-12D4 12" 3000 Watt Dual 4-Ohm Car Audio Subwoofer Sub SWR12D4 | Audio Savings
Alpine SWR-1222D (SWR1222D) 12" Dual 2 ohm Type-R Car Subwoofer
Alpine Jeep Wrangler Single 12-Inch Alpine Halo R-Series Preloaded Subwoofer Enclosure with ProLink R2-SB12V (Universal; Some Adaptation May Be Required) - Free Shipping
Alpine Type-R R2-W12D4 12" 750w RMS Car Audio Subwoofer+Vented Sub Box Enclosure | eBay
Alpine SBR-S12D4 | Performance Car Audio Visual
Alpine 12 Inch Type-R Subwoofer (R-W12D2) | SK Customs Car Audio & Home Theater | Atlanta | Norcross | Duluth | John's Creek
Amazon.com: Alpine ALP19-R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 1500W Peak 12" Subwoofer : Electronics