Alpine R-W10D4 10 inch 750W Car Subwoofer 793276040527 | eBay
Alpine Halo R2-Series Dual 10" Voice Coil 4-Ohm Loaded Subwoofer Enclosure Black R2-SB10V - Best Buy
Best Buy: Alpine Type R 10" Dual-Voice-Coil 4-Ohm Subwoofer SWR-1043D
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