Puremusic,
As much as we speak, we learn something from each other I guess. Normaly, I don't speak very detailed and choose rounded words if someone asks me about a specific component and cables. The reason is doing that is everybody has own brain and ear reference. Plus, I don' hesitate to tell you that I am not a hardcore Audiophile.
However, beginning from early childhood, I have passion towards electronics. Since both is sticked to each other, that's why I am here. Plus, I do own a proaudio system and like to play as DJ. This enabled me have experience a lot. (combining Hi-End and Proaudio, specialy filters and interconnects, powercords.)
I will cut the chase short: Powercords must be last thing you may deal as long as you setup a system.
''According to what you mean by mismatch, would you agree that it's also possible to have a "mismatch" between the contaminated AC and the electronic components? If you agree that such mismatch is possible, then would you agree that it's possible to significantly improve this mismatch by reducing that contaminating noise sufficiently?''
Well, as I said, before reducing EM/RFI, we need to match electronics and speaker, then interconnects, speaker cables. You can't know what is missing or more unless you plug directly to wall with stock cords.
In addition, the voltage must come before the contaminated AC.