Alpine 12” Type R-Series Powered Ported Bass Package Includes one Alpine R-W12D4 12” subwoofer, R-A75M amplifier, and 2.25 ft³ optimized ported enclosure
Universal Car Stereo Slotted S Port Single 10" Alpine Bundle Type R R-W10D4 Sub Box Enclosure with Harmony HA-A800.1 Amplifier & 4GA Amp Kit - Walmart.com
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2) Alpine Type-R R2-W12D4 12" 750w RMS Car Subwoofers+Vented Sub Box Enclosure - Walmart.com
Alpine SBR-S12D4 Type-R 12" Subwoofer Enclosure - Signature Car Sound
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2) Alpine Type-R R2-W12D4 12" 750w RMS Car Subwoofers+Vented Sub Box Enclosure - Rockville Audio
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Sealed / Recessed Sub Box for (2 12") Alpine Type R Subs - Subwoofer Enclosure | eBay
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