Alpine R2-SB12V Single Type R2 12-in Subwoofer in Vented Enclosure - Creative Audio
2) Alpine Type-R R2-W12D4 12" 750w RMS Car Subwoofers+Vented Sub Box Enclosure - Rockville Audio
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