What effect, if any, would the grills on/off make to the higher fq's?

I've wondered about when a speaker designer worries about baffle difraction, using radius' or angles on the leading edges of the baffle face, but then places a grill/grill frame over it. Wouldn't the frame on the grill negate the use of the applied radius/angle on the baffle?

Half of communication is listening. You can't listen with your mouth.