IIRC, the 3 way pioneers have the two mid-high range drivers in the center of the speaker and they shouldn't move. If anything's hitting the grille, it's the entire speaker, which would mean it's not installed correctly. I never had any problem with any of the Pioneers in my doors, I've got the 3ways in the front and 2 ways in the back. And too my knowledge, the driver for the mid-bass doesn't have enough excursion to get far enough to hit the grilles. Then again, what model year car do you have? Mine's a post '98, so there may be a difference in the way the door panel is made.