I definitely noticed a difference when I upgraded my power strip and power cords that feed my class D crown amp. I went from a crappy surge strip to a diy box with 10 awg wire, filtering caps and Hubble non ferrous outlets. That improved the sound. Then I built a 10 awg power cord for the amp and that improved the sound again. I do think the larger diameter wires allow the power to flow more easily, which would make sense since resistance is reduced as conductor diameter increases. With both upgrades I noticed less noise, more dynamics and more/smoother bass.
Power Cables for Class D Amplifiers
Do Class D amplifiers that are very efficient, high power, (ie 600 watts at 8 ohms 1110 watts at 4 ohms) require the heavier lower gauge power cords (10, 9, 8 guage) that we see used on the heavy inefficient high power and high current amps? I ask because the stock power cable that came with my Class D amp was even thinner than the usual stock cord. It's something like a 14 gauge power cable! Is a 10 gauge or lower power cable needed in this ampliifier class as it would be in Class A or AB?