Yes, the AC goes into a transformer that has the primary isolated from ground, so there's no earth ground on the mini and the polarity of the hot/neutral won't matter -- technically speaking. On the other hand, I get two clearly different sound signatures depending on the orientatin -- one way is more mellow and rounded, the other is more dynamic and focused. There's no right or wrong way, whichever way sounds best to you.
-- Jim
-- Jim