Amazon.com: Alpine ALP19-R-W12D2x2wKit Car Audio Type R Dual 2 Ohm 1500 Watt 12" Subwoofers with Sub Install Kit and HA-SWKD Dual Sub Box Install Kit - 16 Screws and Speaker Wire with
Alpine Type S SWS-12D4 12 Inch 1500W 4 Ohm Round Car Audio Subwoofer 793276011848 | eBay
Amazon.com: Alpine R-W10D4 Car Audio Type R Series Sub 1500W Peak 10" Subwoofer Bundle with Harmony HA-A400.1 Amplifier & Amp Kit : Electronics