I just bought a Logitech Z 560 system from the US through a friend. Since I live in India and I purchased the system from US, the power chord that came along with it was 110V. Now, the power here in India is 220V. So, I need some kind of a step down device. I tried a standard 220 to 110V step down, but it seems that it isn't enough to drive my system. What according to you would be the exact kind of device that I would need so that it would work here? Also, the speaker only shows the output power, which is 400watt RMS, but it doesn't say how much power it would consume. All that the specs say that it is a 120V / 6A.
Please help me out.

Please help me out.