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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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Amazon.com: Alpine R-Series R2-W12D4 12 Inch Dual 4-Ohm Voice Coils Subwoofer with 750W RMS : Electronics
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Amazon.com: Alpine ALP19-R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 1500W Peak 12" Subwoofer : Electronics
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