Lanzar OPTIHC2004 4 Channel Digital High Current Full Range Power Amplifier 4x100W RMS at 4 Ohms - Input Sensitivity : 130mV~7V - S/N Ratio : 100dB - Tri-Mode Capable - Fuse Rating : 30Ax2 4x200W MAX at 4 Ohms - Variable Low Pass Filter : 40Hz~350Hz - High Technology SMD Circuit - Double Side Epoxy PCB Circuit Board - Dimensions : 8.11''(W) x 1.97''(H) x 11.4''(L) 2x380W MAX at 4 Ohms Bridged - Variable High Pass Filter : 40Hz~3KHz - Digital High Current Power Amplifier - Power and Protection LED Indicators 4x180W RMS at 2 Ohms - Frequency Response : 10Hz~30KHz - Electronic Crossover Network - Thermal, Overload and Short Protection 2 Ohm Full Range Stereo Stable - THD: 0.1% - Bridgeable at 4 Ohms - Soft Turn-on/Turn-off