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Customer Reviews: Alpine RS-SB12 Halo R-Series sealed enclosure with 12" 2-ohm shallow-mount subwoofer at Crutchfield
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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
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