Alpine W10S4 BassLine Series 10" 4-ohm subwoofer at Crutchfield
Alpine SWR-12D2 - 12 Inch Subwoofer - Car subwoofers - Custom Sounds & Tint
Customer Reviews: Alpine S-SB12V Halo Series 12" linkable ported subwoofer enclosure at Crutchfield
Amazon.com: Alpine SWT-12S4 1000 Watt 12" Car Audio Bass Tube Subwoofer Bundle with Amplifier and Amp Kit : Electronics
2) ALPINE SWR-1542D 4000W 15" CAR AUDIO SUBWOOFERS TYPE R WITH 4-OHM DVC SUBS | eBay
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