I'm saying if they want to mod their phones, they should do it right. If the first person that shows this isn't right in his application of a mod, everyone who follows said mod is doing it wrong too. So you haven't done mods before so you can't really talk...you are correct on that. Doing a mod and simply saying it does this doesn't make it true or correct. Now if you want to use dynamat; you should remove the foil and leave the black tar sticky stuff behind. If you want to lessen vibration, putting dynamat at the back of the cups is the least optimal place to put it.
I've done mods before... And they usually do work. What does not make any sense is just harass people before even trying the mod, but I suppose you can keep trolling around and making weird assumptions. Your advices would be much more appreciated with a better tone in your posts.