Over the years, I’ve experimented with many DC power cables (aka umbilical cords). They can definitely make a significant difference in SQ if your system is revealing.
I tossed out most of the cheap DC power cables that came with my DC power supplies. I installed DIY versions made out of pure OCC copper 20 awg solid core. Some DIY’ers make them with silver wire. Try to route them away from any AC power cords to minimize EMI. Everything matters.