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Amazon.com: Alpine R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 2250W Peak 12" Subwoofer and HA-SWKD Dual Subwoofer Sub Box Install Kit : Electronics
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Amazon.com: Alpine R2-SB12V 12" Loaded Subwoofer Box w/ R2-W12D4 Sub+KTA-200M Amp+Bass Knob : Electronics
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