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Built a free-air subwoofer system for this BMW using Diamond audio subwoofers. | Car audio systems, Custom car audio, Car audio installation
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Amazon.com: Rockville MS10LW 10" 2400w White Marine/Boat 10" LED Free Air Subwoofer Bundle DBM12 2000w Mono Amplifier w/Covers+Bass Remote RMWK4 Amplifier Install Wire Kit (3 Items) : Electronics
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