Universal Car Stereo Slotted S Port Single 10" Alpine Bundle Type R R-W10D4 Sub Box Enclosure with Harmony HA-A800.1 Amplifier & 4GA Amp Kit - Walmart.com
Alpine SWR-1221D 12" Dual 2-ohm Voice Coil Subwoofer at Crutchfield
Alpine Type R Subwoofers SWR-12D2 | eBay
Alpine SWR-1522D Type-R 15" subwoofer with dual 2-ohm voice coils at Crutchfield
Alpine R2-SB12V Single Type R2 12-in Subwoofer in Vented Enclosure - Creative Audio