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2) ALPINE X-W12D4 12" 900w RMS Car Audio Subwoofers+Vented Sub Box En – absoluteusa
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Amazon.com: Alpine Bundle Compatible with Universal Car X-W12D4 Type X 12" Loaded SPL Bass Subwoofer Labyrinth Vent Sub Box Stereo Enclosure : Electronics
Custom Ported Sub Box Enclosure for 1 12" Alpine Type X Subwoofer ~ X-Series | eBay
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Alpine X-Series 12" Dual-Voice-Coil 4-Ohm Subwoofer Black X-W12D4 - Best Buy
Alpine SWX-1243D Type-X 12" Subwoofer - Signature Car Sound
Alpine SWX 1243D Type X 12 subwoofer How to wire the dual voice coils - YouTube