Yeah, it all comes back to me now. I bought the X250.5 based on all of the positive hype from pro reviews as well as users. As I have stated before, it was a huge disappointment. I bought it from an Audiogon member, and had it thouroughly gone over by Nelson himself (great guy and great company). With 4 different speakers, it sounded thin and analytical, the opposite of what I was expecting. Looking back at all of the reading I was doing at the time about the amp, so many users, like Bo1972 were talking about aftermarket cords quite a bit, as if there was something about the sound that needed to be fixed.
I want to note that I ran it in single ended mode, and used the recommended pins in the proper position that are placed in the XLR inputs when they are not being used. The only thing that I can think of to explain the poor sound of the amp in my system with 4 different speakers as well as 3 different cables is that it prefers to be run in balanced mode.
I will be interested to see what your experience is.