@navyachts IDK. I never worry about warranty. I just worry about sound.
You probably have the big heavy cardas binding posts which are a huge mass that the charge has to fill as it passes through. I think I'm in the minority thinking this is important and I don't think it is a huge effect. I'm just into little tweeks that help. so unless you take out the big heavy binding posts, mods probably won't make much difference.
But warranty law is not well understood. For a manufacturer to deny a claim becasue you modified, then they need to show causal relationship between your mod and the failure. For example, if you put a high flow air filter on your car and the window fails, there is no relationship.
Jerry