Alpine S-W10D4 S-Series 10" subwoofer with dual 4-ohm voice coils at Crutchfield
Alpine S-W10D2 S-Series 10" subwoofer with dual 2-ohm voice coils - Breakers Stereo and Performance
ALPINE PWA-S10V 10" VENTED POWERED BUILT-IN AMP ENCLOSURE SUBWOOFER CAR SUB BOX 793276210098 | eBay
Amazon.com: Universal Car Stereo Single 12" Alpine Type S S-W12D4 Bundle with Rearfire Sealed Sub Box Enclosure with S-A60M Amplifier & 4GA Amp Kit : Electronics
Alpine R2-SB10V: 10" Halo Single Pre-Loaded Subwoofer Enclosure – AZ Electronics