DS18 IXS12.4D 12" Shallow Mount Subwoofer 1600W Max Dual 4 ohm Slim Car Bass Sub 810005184281 | eBay
Amazon.com: H YANKA 12 Inch Subwoofer - Paper Cone Car Audio, Black Steel Basket, Dual Voice Coil 4 Ohm Impedance subwoofer, 1600W MAX Power inch Competition : Electronics