This central/backup amplifier switcher provides 12-CH central channels and 2-way backup channels...... MS-602-2 Central/back amplifier switcher features: 1) central channel quantity:12 2) back-up channel quantity:2 3)single channel power capacity:600W 4) POWER SUPPLY: AC 220V/110V, 50-60Hz, DC24V 5) AC power consumption: 40W 6) N.W.: 10kg, G.W: 12.1kg 7) Body size: 482 x 432x 132mm 8)CTN Dim:532x498x238mm