Originally Posted by Perki-Perk
Here's an experiment. Take a drink container and yell into it. I think a closed roof, theoretically, would muffle the noise. In My Opinion. I could be wrong though, it's happened once or twice.
That's not a good comparison unless you're measuring the noise level inside the drink container as you're yelling into it. The closed roof traps the noise inside giving it a chance to bounce around the stadium. There is no question that the closed roof amplifies the noise level.