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
Alpine SWR-1042D Type-R 10" subwoofer with dual 4-ohm voice coils at Crutchfield
Alpine SBR-S12D4 Type-R 12" Subwoofer Enclosure - Signature Car Sound
Insane Bass From Two 12" Alpine Type R (SWR12D4) Subwoofers!! - YouTube
Single alpine type r 12" ripping car apart - YouTube
Alpine SWR-12D2 Type-R 12" subwoofer with dual 2-ohm voice coils at Crutchfield
FS: Alpine Type R 12" sub + JBL BP300.2 mono amp - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)