4) MB Quart DS1-204 400 Watt 8 Inch Shallow Slim Subs DVC Car Subwoofers Four 8" Shallow Mount Car/Truck Subwoofer w/Poly Cone+2" Voice Coil. Peak Power Rating: 400 Watts, RMS Power Rating: 200 Watts 8" Shallow Subwoofer. UV Resistant Butyl Rubber Surround, Durable heavy textured powder coat All new design based on popular RLP shallow subs. Vented aluminum voice coil former, Thermal Formed Polypropylene Cone and Dust Cap 2 High Temp Dual Voice Coils. Deep Drawn Stamp Steel Basket, Sensitivity: 81 dB Top-mount depth: 2.8", Cutout Diameter: 7.24". Impedance 4 ohms, Dual Voice Coils