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
Best Buy: Alpine Type R 10" Dual-Voice-Coil 4-Ohm Subwoofer SWR-1043D
Alpine RS-W10D2, R Series 10" Dual 2 Ohm Voice Coil Shallow Subwoofer, – AVLeaderz