I purchased a siltech cable burn in box approximately a year ago. I personally believe that has been the best purchase in hi-fi I have made as far as sound quality goes. Scary how much better a cable sounds after it has been left on the machine for a week. Even cable that I have run for twenty years and played the system every third night of at least two hours. After that many years and that much time by common wisdom they should have been burned in but large gains after a week on the siltech machine. Had audio connection build me a lowercord burn in machine ot arrived a week ago. I have a power cord on it now I will see what happens with it as well.
At times I wonder when people say cables don't make a difference if they are running lamp cord for speaker wire and the free interconnects that came with a cheap Sony cd player back in the day. If so it is quite easy to see the difference in cables when a person moves up to entry level hi-fi cables. The first couple of hundred dollars makes a huge difference. A person doesn't want to go to far up the wire line with more basic equipment higher the wire the more reveling it is of the sound of the component. Many times a reference grade wire makes a basic component sound bad but what you are hearing is the component not the wire. That is the skill in choosing a hi-fi system is understanding what is sounding wrong and figuring out what to replace. The other skill needed is to be able to eat your own personal mistakes and make changes just because you paid money for something doesn't mean that it is good or that it is a match for your system. Taking your loss and moving on is hard for many audio files..
Regards