4/3/2CH LPF/HPF Specification: RMS power output @4 ohm 50Wx4 @2 ohm 90Wx4 @Bridge 180Wx2 Signal to noise ratio 85db Frequency Resonse(dB) 20Hz~40KHz LPF: 50Hz~250Hz HPF: 500Hz~3KHz Total Harmonic distortion 0.05% Damping Factor >120 Dimension(W*H*L)mm 242*48*320