Yes, aftermarket power cords do make a difference. However, purchasing in-line power conditioners for each component will offer substantial improvements over any power cord (IMO) and costs perhaps no more than a good power cord. Not only does the in-line power conditioner do more than a power cord, it replaces the power cord so that you do not need both. I happen to be using Foundation Research LC-1's and an LC-2 in-line power conditioners. In my case, comparing the Cardas Reference power cord vs. the Foundation Research LC-2 connected to my amp, the LC-2 won hands done.
In addition, installing dedicated lines with no breaks from the service panel to a decent hospital/audio quality outlet make an even greater improvement which ever way you go.
-John
In addition, installing dedicated lines with no breaks from the service panel to a decent hospital/audio quality outlet make an even greater improvement which ever way you go.
-John