Thanks for the chiclets! The whole "which DBX" question is confusing at best. The deal with which ones have transformers and which don't is also really confusing since apparently not all units of the same model have them and people have variously interpreted the "x" in "xt" as meaning that it either has or doesn't have a tranformer. Near as I can tell, the best thing to do if you want a tranformer is to either crack it open and look, or install one yourself. I've never even looked in mine.