I can't vouch for the sound of them (unfortunately) as they're 110v. A slight oversight by myself. And no, I didn't plug them in to find out, I read the label first...!

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If you don't want to modify the speakers, the current draw should be well within the range that one of those cheap little 50W travel transformers ought to work to power them. Just don't use one of the higher power more compact converters for hair dryers and such, those work like a light dimmer and will not be happy running any kind of electronics.