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Amazon.com: Kicker 44L7S104 Solobaric L7 10" Subwoofers Bundle - Dual 4-Ohm Voice Coils for wiring to a 1-ohm monoblock amplifier : Electronics
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Amazon.com: Skar Audio SDR-12 D4 12" 1200 Watt Max Power Dual 4 Ohm Car Subwoofer : Electronics