Alpine SWS-1223D Type-S 12" subwoofer with dual 2-ohm voice coils at Crutchfield
Amazon.com: Alpine Bundle Compatible with Universal Car S-W12D2 Type S Dual 12" Custom Loaded Vented Sub Box Enclosure : Electronics
Subwoofer Specific, Alpine, E-S-R-X Subwoofer – Atrend USA
Amazon.com: Universal Car Stereo Vented Port Single 12" Alpine S-W12D4 Type S Car Audio Subwoofer Custom Sub Box Enclosure Package New Without Amp : Electronics
Alpine 12 Inch Type-S Subwoofer (SWS-12D4) | SK Customs Car Audio & Home Theater | Atlanta | Norcross | Duluth | John's Creek
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 W12S4 12" 750 Watt Peak 250 Watt RMS 4-Ohm Car Audio Subwoofer – Car Toys
Alpine S-Series 12" Dual-Voice-Coil 4-ohm Subwoofer Black S-W12D4 - Best Buy