Alpine W12S4 BassLine Series 12" 4-ohm subwoofer at Crutchfield
Alpine R2-W8D2 8” 350W RMS Car Audio Subwoofer+Ported Sub Box Enclosure R2W8D2 613817082987 | eBay
Alpine Type S SWS-12D4 12 Inch 1500 Watt Max 4 Ohm Round Car Audio Subwoofer
Alpine SWS-1023D Type-S 10" subwoofer with dual 2-ohm voice coils at Crutchfield
Alpine Car Audio Systems 800W 12" bandpass subwoofer in custom enclosure 7427282664141 | eBay
Alpine S-DB8V-TRK Halo Series 8" ported dual subwoofer enclosure with two 8" S-Series subwoofers at Crutchfield
Universal Car Stereo Single 12" Alpine Bundle Type S S-W12D4 Bundle with Rearfire Sealed Sub Box Enclosure with Harmony HA-A800.1 Amplifier & 4GA Amp Kit - Walmart.com