Rockville RXD-M3 4000 Watt/2000W RMSMono Car Amplifier+100% CopperAmp Wire Kit Rockville RXD-M3 4000 Watt/2000w RMS Mono Class D 1 Ohm Car Stereo Amplifier With Optical Coupler Technology. High-Speed MOSFET Power Supply. Optical Coupler Class D Technology. Studio-Grade Bipolar Output Stage Transistors Now exclusively with Professional Peak Limiter Circuitry which guarantees distortion free musical playback at all levels. Fully Adjustable 12dB / Octave Crossover with Differential Circuitry Phase Control Switch. Full IC-Controlled Protection Circuitry. Remote Dashboard Subwoofer Control. Fully Adjustable 12dB Bass Equalizer Mute and Delay Soft Start System. RCA Preamp Line Output. 8 Volt Preamp Circuitry. Status Mode LED Indicator. Minimum THD at Rated Power: &lt; 0.05% Rockville RWK4CU 4 Gauge 2 Channel Complete Car Amplifier Installation Kit 100% Pure Copper RCA Cables. Designed specifically for car audio systems over 1000 watts RMS to 2000 Watts. Made from silver-tinned 100% virgin copper for a pure uninterrupted transfer of power and signal. The solid brass gold plated Mini ANL Fuse Holder offers ideal protection for high powered systems