Alpine SWR-1242D Type-R 12" subwoofer with dual 4-ohm voice coils at Crutchfield
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Alpine SWR-T12 12" Type-R High Performance Thin Car Subwoofer
Alpine 8" Type R Single Enclosure | P.C. Richard & Son
SWR-12D4 | 2250W Peak 12" Series Dual 4-Ohm Car Sub | Alpine
Alpine SBR-S12D4 Type-R 12" Subwoofer Enclosure - Signature Car Sound