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2) Alpine Type-R R2-W12D2 12" 750w Subwoofers+Vented Box+Mono Amplifier+Amp Kit - Rockville Audio
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Alpine 12” Type R-Series Ported Bass Package Includes one Alpine R-W12D4 12” subwoofer, and 2.25 ft³ optimized ported enclosure
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Amazon.com: Universal Car Stereo Slotted S Port Single 12" Alpine R-W12D4 Type R Car Audio Subwoofer Custom Sub Box Enclosure Package New : Electronics
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LAB SlapBox™ 2.25 ft^3 Ported MDF Enclosure Box for Single Alpine 12" R-Series Subwoofer
