Alpine SWR-1042D Type-R 10" subwoofer with dual 4-ohm voice coils at Crutchfield
Subwoofer Box Alpine Type R SWR-1242D | Ported Box | Slot
Alpine SWR-1042D Woofer, 500 W RMS, 1500 W PMPO - Walmart.com
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Alpine Jeep Wrangler Single 12-Inch Alpine Halo R-Series Preloaded Subwoofer Enclosure with ProLink R2-SB12V (Universal; Some Adaptation May Be Required) - Free Shipping
Amazon.com: Alpine R2-SB12V Next-Gen 12" R-Series Halo Loaded Sub Enclosure with KTE-12G.3 Grill : Electronics
Amazon.com: Alpine ALP19-R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 1500W Peak 12" Subwoofer : Electronics