Hey guys I just bought some MW6503 drivers for my project, and the surrounds don't have the notches cut out. When I installed them I tightened them down, and backed off a hair. I wasn't home for a while, and the AC was turned off. Later I was playing some music, and could hear a farting noise. I looked at the drivers and some of them the rubber wrinkled to the point where air could escape. Luckily I turned most of the screws back enough that I didn't have more damage. If you get replacement woofers install the screws most of the way, and take an exacto knife and cut out the rubber that would be under the screws.