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Alpine S-Series 12" Dual-Voice-Coil 4-ohm Subwoofer Black S-W12D4 - Best Buy
Alpine R-Series R2-W10D2 10" DVC Car Audio Subwoofer, 2 Ohm, 750 Watts – Car Toys
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Alpine Type R 12 Inch 2250 Watt Max 4 Ohm Round Car Audio Subwoofer | R-W12D4 - Walmart.com
Alpine R2-SB12V Single Type R2 12-in Subwoofer in Vented Enclosure - Creative Audio
Alpine Type R 12' SWR1243D Subwoofer | eBay
Alpine W12S4 | 750 Watt 12" Single 4-ohm Car Subwoofer
Alpine BassLine Series 12 Inch 750 Watt 4-Ohm Car Audio Subwoofer | W12S4 - Walmart.com
Alpine R-Series 12" Halo Subwoofer Enclosure - R2SB12V | Abt
Best Buy: Alpine X-Series 12" Dual-Voice-Coil 4-Ohm Subwoofer Black X-W12D4
Alpine 12 Inch Bass Line Subwoofer (W12S4) | SK Customs Car Audio & Home Theater | Atlanta | Norcross | Duluth | John's Creek
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