Noise floor of any DAC measured here in the blue and green section of the chart is inaudible. Probably also in the orange and red sections.
Do you have audible noise in your system (noise you can hear at the listening position in the silence between tracks).
If so, you need to find the cause and eliminate it - you won't get rid of it using power exotic cables. And even if exotic power supples or power conditioners influence it there will be much much lower cost solutions possible (such as using toslink between source and DAC, or using balanced analogue connections from DAC to Amp.