4 x 250 Watts RMS @ 4 Ohms - New Compact Design Based on Class-D Technology - Variable Bass Boost : 0-18dB - Frequency Response : 20-40K Hz * 4 x 550 Watts MAX @ 4 Ohms - Double Sided SMT Circuit Board - Nickel Plated Low Level RCA Input - S/N Ratio > 95 dB * 4 x 400 Watts RMS @ 2 Ohms - 2 Ohms Stereo Stable - Power Protection LED Indicators - Fuse : 25A x 2 * 4 x 800 Watts MAX @ 2 Ohms - LPF Variable Crossover : 30Hz-200Hz 24dB/Oct - Advanced Protection Circuitry - Dimension : 8.3"(L) x 6.1"(W) x 2.7"(H) * 2 x 1600 Watts Peak Bridged @ 4 Ohms - HPF Variable Crossover : 50Hz-250Hz 12dB/Oct - Soft Turn On/Off