2 Used Alpine type-S 10 Subwoofers in custom Trapezoid Box SWS-1042D | eBay
Alpine SWS-10D2 Type-S 10" subwoofer with dual 2-ohm voice coils at Crutchfield
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