Installing these was one of the first tweaks I tried along with isolation and power conditioning. Not to mention the interconnect and speaker cable changes I've gone through. Possibly 10 to 20 upgrades in the last two months. And you know what? There have been so many, I can't even tell what difference most of them made.
The only difference I can be sure of was the change my new speaker cables and speakers made. And the best I can say is that the cummulative effects have been very good. I just wish I knew which products actually helped. Now I'll have to take them out one by one just to be sure.
The only contribution I can be sure the Cardas Caps have given me is "peace-of-mind", and "Oooh, those are cool looking". Or maybe that should be "delusion-of-mind".
In Discover Magazine they once ran an article on the reason why pizzas stay hot so long. They said it was because the tomato sauce was good at trapping and retaining heat. Maybe I'll stick a couple slices on my amp.
