Vented Subwoofer Box for Alpine Type R12 (E12, S12, or X12) | 3D Warehouse
Alpine Type-R SWR-12D4 12" 3000 Watt Dual 4-Ohm Car Audio Subwoofer Sub SWR12D4 | Audio Savings
Alpine R-Series R2-W12D2 12 Inch Dual 2-Ohm Voice Coils Subwoofer with 750W RMS
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 Type R 12" Dual Voice Coil 4ohms | P.C. Richard & Son
Alpine R2-W12D4 R Series 12" subwoofer with dual 4-ohm voice coils at Crutchfield