Just an FYI. I don't own Vandys, but for some reason I think John Rutan of Audio Connection, Verona, NJ uses ARC gear to power up his Vandys. John is dealer for both Vandersteen and ARC. If John catches this OP, perhaps he can weigh in. Otherwise, I suggest that the OP contact John. He's a great guy and I'm sure he would be happy to help out.
I am not an ARC or Vandy dealer and have no economic or family relationship to John Rutan or Audio Connection.