Output power: 5W*1+3W*2 Speaker unit: 3 "*1+ 2 1/4"*2(magnetically shielded) S/N Ratio: >50dB Importing Sensitity:Stereo input:460mV,AC-3input:150mV Dimension: woofer:L 108*W150*H125mm, satellites: L67*W158*H98mm