Theoretically, there should be little to no difference between the two, but many 'philes say 220V sounds better. I don't know personally, but the main difference is that 220V device uses half the current a similar 110V one would. This is the main reason your home's electric stove, dryer, and A/C unit use 220.
Which sounds best, 120 volts, or 240 volts?
I read all these reviews and comments that say how a new power cord can make a system sound better! Or different. With just a tiny adjustment, just a few feet of wire making audiable differences. I'm not disputing that, but it raises the question, can you hear the difference between a system powered by 120 volts here in the US, from a system in Europe that runs on 240? Surely that's a huge difference that should be immediately noticable. However it is hard to get a side by side comparison, most components needing internal adjustments to convert from one to the other, and of course the changing of input current. Different frequency too! From 60hz here to 50hz there, these have got to be major differences compared to swapping a cable? Any of you jet setters out there have an opinion on this? Do you prefer the sound on one side of the pond to the other?