JL Audio RD400/4 4-Channel Class D Full-Range AmplifierPower your music JL Audio's RD400 4 4 channel amplifier will power each your car's front and rear speakers with 75 watts RMS, so you'll hear and feel your music clearly over the whistle of the wind and rumble of the road. For driving bass, you can switch the RD400 4 to 2 channel mode and run a couple of subwoofer with up to 200 watts RMS each. Low current demand, low distortion, and integrates well The RD400 4 plays your music with true fidelity and