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Alpine Halo R2-Series Dual 12" Voice Coil 4-Ohm Loaded Subwoofer Enclosure Black R2-SB12V - Best Buy
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Customer Reviews: Alpine S-SB12V Halo Series 12" linkable ported subwoofer enclosure at Crutchfield
Alpine R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 2250W Peak 12" Subwoofer | ALP19-R-W12D4
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Alpine RS-SB10 | Pacific Stereo
Alpine RS-W12D4 | Pacific Stereo
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Alpine SWR-12D2 - 12 Inch Subwoofer - Car subwoofers - Custom Sounds & Tint