4-Channel Class AB Car Ampilfier Load 4 Ohm: 50W RMS x 4load 2 Ohm: 90W RMS x 4Btl 4 Ohm: 150W RMS x 2Signal to noise ratio: 90dBFrequency response: 20-20KHzTHD: 0.01%Dimension(L×W×H):324×244×49mm