Power Acoustik 12" 2500W 4 OHM MOFOS-12D4 Type S Car Audio Subwoofer – Pricedrightsales
Amazon.com: Gravity G3-12D4 12 Inch 4000 Watt Car Audio Subwoofer, WZ3000.1D Warzone 3000W Class D Amplifier with Remote Control 4 Gauge 2300W Car Amplifier Installation Kit : Electronics
QWX4000-12D4 – Quantum Audio
Amazon.com: American Bass Usa XR 12D4 2400W Max Dual 4Ω 12" Subwoofer,Black : Electronics
CROSSFIRE CAR AUDIO C5-12D4-V3 - Down4Sound Shop
Alpine Type S SWS-12D4 12 Inch 1500 Watt Max 4 Ohm Round Car Audio Subwoofer