I think most of us know the sound of our systems and notice changes when something is changed in the system for better or worse.
That said, my system sounds different to me depending on the time of day (cleaner power coming in from the grid?) or just depending on the day. Are my ears a little fatigued? Am I a little distracted and not tuned-in enough so to speak?
Is my wife running more electric appliances that usually are not running? My house has two refrigerators and an upright freezer. In fact, my whole house is electric. A/C, Heat pump, pool pump, everything. I know when the electric dryer is on when listening to my system. I have separate breakers and lines for my equipment but still think I'm getting contamination(?) from these appliances running at certain times of the day.
Has my system had plenty of time to warm up?
I spent good money on my equipment and room. Not to mention time and effort to get the best I can out of it. If I need magic gemstones on my $400 dollar cables then I probably bought the wrong cables.
My point being is that my system doesn't always sound at it's best to my ears and I doubt adding some tiny discs to my already good cables are going to make a difference. Maybe, maybe not. But, I think I'll put my money someplace better spent like more music or towards an equipment upgrade or even more room treatments. Or, try getting better/cleaner power to my system.