I thought the same thing at first, not because power does not matter, but because I beleived that a good component should have power suppply adequate to compensate for poor AC power. But nothing is perfect and some noise always gets through. The question is how much? The answer depends on many factors including your AC, your wiring, your components, your configuration.

But to make a blanket statement that power does not matter should be seriously reconsidered.

DSP6000, DSP5200, DSP5500VC, P300W, SW1600, G68, 568.2, HD621, G57, G55, Oppo BDP-105.