I have the equipment to do so, so it's of no bother to me.
Using RMAA, you could measure changes in the output signal according to the power supply given, yes; sorry I didn't make my intentions clear. What you stated is most likely what I'll do.
However, I still remain skeptical towards how far these measurements go to the perception of music. You may disagree, but for me, it's worth investigating the other side just for the sake of being conclusive, if nothing else.
And no, I'm not talking about power conditioning. Isn't that what a PSU is supposed to do? If it can't filter out the crap coming out of the wall, what good is it anyway? I'd be ticked about getting a power conditioner that did make a change because that means my PSU inside the whatever isn't filtering things good enough.