Mac Audio MPX 4000. Audio output channels: 4.0, Total Harmonic Distortion (THD): 0.05 %, Signal-to-Noise Ratio (SNR): 100 dB. Connectivity technology: Wired. Weight: 4.65 kg. Power requirements: 12 V DC, Output power (DIN): 2 Ω - 4x80 W; 4 Ω - 4x60/2x160 W, Dimensions (WxDxH): 319 x 59 x 226 mm