Lanzar VBRA4001D 4000 Watt Mono Block Digital Amplifier RMS Power @ 4 Ohms: 1 x 500 Watts - Heavy-Duty Heatsink - High-Pass / Low-Pass Electronic Crossovers With Adjustable Frequency - Simultaneous Mono / Stereo Operation Capability - Bass Boost: 0~12dB RMS Power @ 2 Ohms: 1 x 1000 Watts - Oversized Capacitor Tanks - Adjustable Bass Boost - Short Circuit / Thermal / Overload / DC Offset Protection - Signal To Noise Ratio: 80dB RMS Power @ 1 Ohms: 1 x 2000 Watts - Die Casting / Custom Terminal Block And Gold / Nickel Plated RCA Jacks - Remote Bass Boost - Line Audio Output Jacks - Fuse Rating: 35A x 3 Peak Power @ 1 Ohms: 1 x 4000 Watts - High / Low Level Inputs (Except Mono) - Soft Turn On Delayed Remote Turn-On / Off Circuitry - Power / Protect LED Indicators - Frequency Response (+/- 1dB): 10Hz-250Hz - Unit Dimensions: 14.33''L x 10 High-Efficiency MOSFET Power Supply - Adjustable Input Gain Control - Full 1Ohms Mono Stable Operation - THD: 1% - Low Pass Crossover Frequency: 35Hz-250Hz