Alpine SWR-8D4 8" Inch 1000w Dual 2 Ohm Type-R Car Subwoofer Sub SWR8D4+ROCKBOX | Audio Savings
Alpine SWR-1242D Type-R 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Alpine SBR-S12D4 | Performance Car Audio Visual
Amazon.com: Alpine SWT-10S2 10" 1000W Peak/350W RMS Shallow Slim Truck Car Subwoofer Bundle with Rockville ROCK EVERYWHERE Portable Bluetooth Speaker/Waterproof/Wireless Link : Electronics
Alpine SWX-1043D Type-X 10" DVC Subwoofer - Signature Car Sound
12" ALPINE TYPE R 12D4 1000 watt RMS [Nissan Skyline R33] - YouTube