I have a C3, generally considered to be one of the quietest modulars. I don't have a barn door screen, but if I duck down, it goes very (relatively) quiet.
But I would never consider riding without some of those "little yellow marshmallow things" in my ears. I've kept pretty good hearing, I intend to continue doing so. Losing half a minute before each ride is well worth not losing hearing for the rest of my life.
My son has just got himself a (non-modular) C2 which he finds significantly quieter than his previous Shoei (don't know the model). He doesn't have a real windscreen on his Monster, and also always wears ear-plugs.