Interesting. Pre-amp to power amp and power amp to speakers follow the often-mentioned idea of "signal flow" (somewhat misleading) being in the same direction as the writing. Power cords can't be changed (natch), although they appear to be oriented the other way, but this does not mean much if that's the way the wire was drawn. The CD player to DAC, and DAC to pre-amp are oriented with the writing going the other way. I've not seen this sort of inconsistency before, but I would be inclined to follow the manufacturer's recommendation. Maybe I'd try reversing the interconnects between CD-DAC and DAC-preamp to see if I could hear a difference.