Gene, I know this is not the right thread but I just got too curious about the freq response plots in the X5200W review. I didn't quite notice this when I read that review thread. When I looked at it again now, I highly suspect the graphs had the "no Audyssey" (pink) and with Audyssey (green) reversed. I have run Audyssey many times and I have never seen Audyssey messing things up that bad. Could you double check to see if the labels were in fact reversed?
I do realize if the two curves were labelled wrong, then the blue one must have been for DEQ on but ith front bypassed since they have the same shape except for the LF/HF boost, so my supposition is probably wrong because the chance for you to have a double error should be next to zero, but then I really wonder why you got such poor results with Audyssey.