For what is is worth to prospective helmet buyers, my Schuberth flip-up is noisier than my HJC (not flip-up) which is noisier than my Shoei RF800. I have discovered, though, that most of the noise on the Schuberth occurrs when the vent in the chin bar is open. I ride with ear plugs and most of the time I do not need the chin bar vent open so it really isn't a significant problem.
Joseph

"Politics does not make strange bedfellows. Marriage does." Marx, Groucho