Amazon.com: Alpine R-W10D2 Car Audio Type R Series Sub Dual 2 Ohm 2250W Peak 10" Subwoofer and HA-SWKD Dual Subwoofer Sub Box Install Kit : Electronics
Alpine 8" Type R Single Enclosure | P.C. Richard & Son
Alpine Dual 10” Type-R Thin Sealed Bass Package Includes two Alpine SWR-T10 10” thin subwoofers, and sealed enclosures
Alpine RS-W10D2 | Pacific Stereo
Alpine SWR-1222D Type-R 12" subwoofer with dual 2-ohm voice coils at Crutchfield
SWR-10D4 - Alpine 10" Dual 4-Ohm Type-R Series Subwoofer
Alpine SWR-1522D Type-R 15" subwoofer with dual 2-ohm voice coils at Crutchfield