Do CD Transports benefit much from upgraded power cords?

Objectivists say - theory says it doesn't matter, so it can't matter. Empiricists say, observation tells me it does matter. Technically informed empiricists then attempt to find out why, at a theoretical level, it does matter. The latter is how the state of knowledge advances and is all the better for that, in my opinion.

Thanks for the various comments. A couple more observations, if I may. As far as I'm concerned, when it comes to engineering, if it doesn't contradict the laws of physics, anything is possible. Secondly, when it comes to measurements, there are issues with aggregation. For example, differences in measured performance at component level can get buried when the aggregate performance of a device is measured. Thirdly, multi-variable dynamic phenomena are the hardest to model. Formula cars provide a good example of the latter. A team like Mercedes can go from having a dominant car to one which is marginally competitive in the space of one season. That's notwithstanding having an army of the best engineers and simulation and measurement tools. There is plenty of snake oil, mostly at the margins, of the hi fi industry. But there is also a huge amount of effort by honest, well motivated engineers attempting to advance the state of the art. Personally, I think that should be respected and given credit.

@grunge1000, large scale statistical tests of audio differences are extremely difficult to organise and audio manufacturers are not pharmaceutical companies whose budgets and regulatory environment require them. I'm not sure of you are drawing inferences or conclusions from your statement in regard to the absence of tests, but to the extent you are, the absence of tests is simply a statement of fact. It doesn't prove or imply anything about the sonic effects of power cords.