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Alpine S-Series 12" Dual-Voice-Coil 4-ohm Subwoofer Black S-W12D4 - Best Buy
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Amazon.com: Alpine ALP19-R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 1500W Peak 12" Subwoofer : Electronics
Alpine SWR-12D2 Type-R 12" subwoofer with dual 2-ohm voice coils at Crutchfield
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ALPINE RS-SB12 12” HALO 1800w Shallow Slim Loaded Subwoofer in Sub Box Enclosure for sale online | eBay
Box build for 2-12" Alpine Type-R subs - YouTube
Building a Ported Box for a 12" Alpine Type R - YouTube
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Amazon.com: Alpine Type R 2 12" Custom Ported/Vented Sub Box Subwoofer Enclosure 32hz : Electronics
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Alpine 12” Type R-Series Powered Ported Bass Package Includes one Alpine R-W12D4 12” subwoofer, R-A75M amplifier, and 2.25 ft³ optimized ported enclosure