2 Used Alpine type-S 10 Subwoofers in custom Trapezoid Box SWS-1042D | eBay
Alpine S-S65C S-Series 6-1/2 Inch 2-Way Component Speaker
Amazon.com: Universal Car Stereo Vented Port Single 12" Alpine S-W12D4 Type S Car Audio Subwoofer Custom Sub Box Enclosure Package New Without Amp : Electronics
Alpine SWS-15D2 Type-S 15" subwoofer with dual 2-ohm voice coils at Crutchfield