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Alpine R2-SB12V Single Type R2 12-in Subwoofer in Vented Enclosure - Creative Audio
Alpine R-W12D2 12" Dual 2 OHM Type-R 2250W Pro Loud Subwoofer Speaker Sub - Walmart.com
Customer Reviews: Alpine SWR-12D4 Type-R 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Universal Car Stereo Vented Enclosure Single 12" Alpine R2-W12D4 Type – absoluteusa
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Alpine Type-R 12" 1000W Subwoofer Black SWR-12D4 - Best Buy
R-W12 Alpine Type R 12 Inch 2250 Watt Max 4 Ohm Round Car Audio Subwoofer %7C R%2DW12D4
Custom Ported Subwoofer Box Enclosure for 2 12" Alpine Type R Subs - R-Series | eBay