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R2-W10D4 10-inch R-Series Subwoofer – Audio Design
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Amazon.com: Alpine R-Series R2-W12D4 12 Inch Dual 4-Ohm Voice Coils Subwoofer with 750W RMS : Electronics
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Alpine Halo R2-Series Dual 12" Voice Coil 4-Ohm Loaded Subwoofer Enclosure Black R2-SB12V - Best Buy
Alpine Type-R 12" 1000W Subwoofer Black SWR-12D4 - Best Buy
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Alpine R2-W8D2 8” R-Series 350W RMS Subwoofer Dual 2 Ohm Car Audio Sub R2W8D2
Alpine R-Series R2-W12D2 12 Inch Dual 2-Ohm Voice Coils Subwoofer with 750W RMS
