Saturn, it's funny you bring that up. I spent about 15 minutes on the phone many moons ago with one of Monitors designers and asked about the caps. Did I need to pull them etc. He told me that the sonic difference in the highs is very minute and if I understood him correctly, humans might not be able to even hear it. Very nice fellow by the way. It's a shame they are so blasted hard to contact as once you get to them, they are very helpful.
Now given that, I could swear I hear a change when I pull them but I have left them on all my MA's.