Lanzar OPTI4001D Optidrive Digital Mono Block 4000 Watt Half Ohm Stable Power Amplifier 1,020 Watts RMS Power at 4 ohm - 0.5 ohm Stable - Variable LPF: 50Hz~250Hz - Strap two amps together for twice the power - Remote subwoofer Level control 1,800 Watts RMS Power at 2 ohm - Frequency Response: 10Hz-250Hz - Variable Bass freq: 21Hz~80Hz - Nickel-plated RCA connectors and Screw terminals - Soft Turn-on/Turn-off 2,600 Watts RMS Power at 1 ohm - S/N Ratio (4 ohm ): 90dB - Variable Bass Boost: 16dB - Thermal, Over load and Speaker short protection - Dimensions : 10.63''(W) x 2.12''(H) x 21.65''(L) 4,000 Watts RMS Power at 0.5 ohm - Variable subsonic: 15Hz-45Hz - Source Voltage: 9 - 18VDC - Double Side Epoxy PCB Circuit Board THD 4ohm Power 0.5% - Phase shift: 0~180 degrees - Line In and Line Out - Power and Protection LED Indicators