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ALPINE SWS-1242D 12" Dual 4 ohm Type-S Series Car Subwoofer. Tested works. Used | eBay
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Alpine S-W12D2 12" Subwoofer S-series w / Dual 2-Ohm Voice Coils — Automotive Sound and Protection
Amazon.com: Universal Car Stereo Vented Port Single 12" Alpine S-W12D4 Type S Car Audio Subwoofer Custom Sub Box Enclosure Package New Without Amp : Electronics
Alpine S-W12D2 S-Series 12" subwoofer with dual 2-ohm voice coils - Breakers Stereo and Performance
Alpine Next Generation S-Series 12" Dual-Voice Coil 4-Ohm Subwoofer Black S2-W12D4 - Best Buy
Alpine S-W12D4 S-Series 12" subwoofer with dual 4-ohm voice coils - Breakers Stereo and Performance