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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
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Alpine Dual 10” Type-R Thin Sealed Bass Package Includes two Alpine SWR-T10 10” thin subwoofers, and sealed enclosures
2) Alpine Type-R R2-W12D4 12" 750w RMS Car Subwoofers+Vented Sub Box Enclosure - Walmart.com
Sealed / Recessed Sub Box for (2 12") Alpine Type R Subs - Subwoofer Enclosure | eBay
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Alpine R-Series 12" Halo Subwoofer Enclosure - R2SB12V | Abt
Universal Down Firing High-End Custom Hand Crafted Subwoofer Enclosure – Sounds Good Stereo Online
Alpine SBR-S8-4 Ported enclosure with one 8" Type-R subwoofer at Crutchfield
Sealed / Recessed Sub Box for (2 12") Alpine Type R Subs - Subwoofer Enclosure | eBay
Alpine | S-SB12V 12" Alpine Halo Subwoofer with ProLink™
Box build for 2-12" Alpine Type-R subs - YouTube
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Amazon.com: Universal Car Stereo Paintable Ported 10" Alpine R-W10D4 Type R Car Audio Subwoofer Custom Sub Box Enclosure Package New : Electronics
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Sealed / Recessed Sub Box Enclosure for 1 15" Alpine Type R SWR-15 Subwoofer | eBay
Alpine R2-SB12V Single Type R2 12-in Subwoofer in Vented Enclosure - Creative Audio
Amazon.com: Alpine R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 2250W Peak 12" Subwoofer and HA-SWKD Dual Subwoofer Sub Box Install Kit : Electronics
