Alpine SWR-1042D Type-R 10" subwoofer with dual 4-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)
Alpine SWR-1242D Type-R 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Alpine SWR-1242D (SWR1242D) 12" Dual 4 ohm Type-R Car Subwoofer
Alpine Type-R R-W12D2 12" 750w RMS Car Audio Subwoofer+Vented Sub Box Enclosure - Rockville Audio