Amano

My basic question is this: How do I calculate the total power/wattage usage for a home speaker system (subwoofer + two satellite floor speakrs)?

Here's why: I found these speakers in the give-away area of my apartment complex and it's become my new project to try to set this thing up. The problem is that it was purchased in Korea which has different voltage requirements than the US (220V, 60Hz). Figuring that part out is relatively easy since all I'll need is a Voltage transformer, but the problem is that I need to know what Power/Wattage rating the transformer should be.

The subwoofer has an RCA audio input, and two speaker line outputs. On the subwoofer, there are two wattages reported on two separate lines: 100W and 210W. These are in Korean so I'm guessing that 100W is normal power usage, and 210W is peak usage. Another interpretation is 100W = subwoofer power usage, 210W = total allowed power usage by satellite speakers. On the two satellite speakers, they each list 50W/80W. Only the subwoofer has a power cord.

So how do I know the total power requirement I'll need? If my first interpretation is correct, my guess would be 210+80+80=370W. If my second interpretation is correct, then it would be more along the lines of 100+80+80 = 270W.

I've never had to hook something like this up, even when the labels are in English, so perhaps someone who is more familiar with home stereo equipment and would know what specs are normally given could help me out!

Thanks in advance