Alpine X-Series 12" Dual-Voice-Coil 4-Ohm Subwoofer Black X-W12D4 - Best Buy
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Amazon.com: Alpine X-W10D4 Car Audio Type X Dual 4 Ohm 1800 Watt 10" Subwoofers with Sub Install Kit Package : Electronics
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Alpine X-W12D4 X-Series 12" subwoofer with dual 4-ohm voice coils at Crutchfield
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LAB SlapBox™ 2.00 ft^3 Ported MDF Enclosure Box for Single Alpine 12" X-
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