Alpine SBR-S12D4 Type-R 12" Subwoofer Enclosure - Signature Car Sound
Amazon.com: Alpine ALP19-R-W12D2x2wKit Car Audio Type R Dual 2 Ohm 1500 Watt 12" Subwoofers with Sub Install Kit and HA-SWKD Dual Sub Box Install Kit - 16 Screws and Speaker Wire with
Alpine SWR-8D2 - 1000 Watts 8" Type R Series Dual 2 Ohm Voice Coil Car Subwoofer | eBay
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Insane Bass From Two 12" Alpine Type R (SWR12D4) Subwoofers!! - YouTube
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Alpine SWR-1242D Type-R 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Subwoofer Box Alpine Type R SWR-1242D | Ported Box | Slot
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KTE12G - Grill for Alpine Type R 12" subwoofers
Alpine SWR-1242D Type-R 12" subwoofer with dual 4-ohm voice coils at Crutchfield