Kicker Pair of 48CWRT104 CompRT Series Shallow-Mount 10" Subwoofer with Dual 4-Ohm Voice Coils Kicker 48CWRT104 CompRT Series Shallow-Mount 10" Subwoofer works best with a sealed enclosure and 400 watts of recommended power with a pair of 4-Ohm voice coils. These speaker's UV-resistant cones and surround help make the CompRT sound great. Product Highlights: 10" shallow-mount subwoofer with dual 4-ohm voice coils Injection-molded polypropylene cone and rubber surround Power Handling: 400 watts RMS (800 watts peak) Frequency response: 25-500 Hz Sensitivity: 84.8 dB Top-mount depth: 3.4125" Sealed box volume: 0.4 - 1.25 Cu. Ft. Ported box volume: 1.25 - 1.75 Cu. Ft.