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Alpine Type-R R2-W12D4 12" 750w RMS Car Audio Subwoofer+Vented Sub Box Enclosure | eBay
Alpine SBR-S12D4 Type-R 12" Subwoofer Enclosure - Signature Car Sound
Alpine SWR-1222D Type-R 12" subwoofer with dual 2-ohm voice coils at Crutchfield
Amazon.com: Alpine R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 2250W Peak 12" Subwoofer and HA-SWKD Dual Subwoofer Sub Box Install Kit : Electronics
Amazon.com: Alpine R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 2250W Peak 12" Subwoofer and HA-SWKD Dual Subwoofer Sub Box Install Kit : Electronics