we don't really know where you are, and that makes a difference in what type of power distro you have to begin with. And that's before any attempts at adjusting for "best sound".
Personally, in the US, I would use 220Vac power to run an SSL, and have done so. As all things though, it is a systems approach that is needed. I have been putting them into large system integration where there will be too much power used to even consider some of the oft touted minimalist approaches, such as running everything off one leg. If you are using a full sized SSL I think that will generally be the case, but if you are using a cut down board, there may be other options.
So, as usual, it depends. :-)
Cheers
Alan