DS18 ZXI15.4D-PKG Bass Package - 2 x ZXI15.4D - 15" Car Subwoofer, ZR2
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Skar Audio Dual 15" 2,500 Watt EVL Series Subwoofer Package - Includes 15-Inch Dual 4 Ohm Subwoofers in Ported Box - Walmart.com
Edge RS12K Single 12in Complete Echo Series Subwoofer Bass Package, Include Class-D Mono Amplifier and Complete Wiring Kits - China Sbwoofer and Audio Speaker price | Made-in-China.com