I used the PS Audio Statement SC power cords for my ATC 50ASL and three 20A-2 with very good result. As with all components, different power cords have different sound characters. It is your choice to pick the one that suit your taste.
Also, the interconnects that goes from the pre-amp to your powered speakers contribute to the sound of your speakers or system as well. It is a system as a whole that work together.
Also, the interconnects that goes from the pre-amp to your powered speakers contribute to the sound of your speakers or system as well. It is a system as a whole that work together.