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Alpine 12” Type R-Series Powered Ported Bass Package Includes one Alpine R-W12D4 12” subwoofer, R-A75M amplifier, and 2.25 ft³ optimized ported enclosure
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Amazon.com: Alpine RW10D2 2250W Dual 2 Ohms Voice Coil Subwoofer, 10 Inches : Electronics
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SWR-10D4 - Alpine 10" Dual 4-Ohm Type-R Series Subwoofer
