Detailed Specifications: Model/Parameters E-400EV, Channels: 2 channels, 8Ω Output Power per Channel: 2*400W, 4Ω Output Power per Channel: 2*600W, Frequency Response (1W, 8Ω, +0/-35dB): 20Hz-35KHz, Total Harmonic Distortion (8Ω full power, tested under 20Hz-20KHz conditions