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Best Buy: Lightning Audio 10" Single-Voice-Coil 4-Ohms Subwoofer P3.10.4
Amazon.com: MTX Audio TN12-04 12" Single 4 ohm Terminator Series Subwoofer : Electronics
Car Speaker Package Of 2 Pairs of Lightning Audio by Rockford Fosgate L675-S 6-3/4" Inch 3-Way 80-Watt Black Full Range 4 OHM Car Coaxial Speakers Bundle Combo With Enrock 50 Foot 16-G
Pair of (2) Lightning Audio By Rockford Fosgate L0-S412 LA-Zero 12-Inch 4-Ohm Car Audio Single Voice Coil Subwoofer Bundle Combo With Enrock 50 Foot 16 Gauge Speaker Wire - Walmart.com
Lightning Audio Bolt P3.12.4 12" 4-ohm component subwoofer at Crutchfield
Lightning Audio S12.2.4-Vc2 at Onlinecarstereo.com