Alpine RS-W12D4, R Series 12" Dual 4 Ohm Voice Coil Shallow Subwoofer, – AVLeaderz
Alpine (2) S-W12D2 Car Audio Type S Series Sub 1200W Peak 12" Subwoofer Bundle with Harmony HA-A800.1 Amplifier & Amp Kit | HA-SUBPACK11
Amazon.com: Universal Car Stereo Rearfire Sealed Single 12" Alpine S-W12D4 Type S Car Audio Subwoofer Custom Sub Box Enclosure Package New : Electronics