i had a blue voodoo that had eminence speakers in it. from what i know about them, if they have v30's in them, there's a little badge in the lower right hand corner of the front grille. but the best way to make sure is simply to open it up and check it out. either way, they are nice cabs. i ended up selling my blue voodoo and getting a mesa cab, but the blue voodoo did just fine for the decent amount of time i had it (about 6 years probably).
mine had selectable impedence and could also run in stereo. it was very nice for what it was.