Why did you feel you needed to open up the backs of the midrange box's? That MDF is brutal on hole saws HA HA . i went through a couple cutting port holes and using the router requires a patient hand for sure. It not only ruins the bits the hole gets mishappen and oversize if you move to fast. Its a steep learning curve and it gets expensive fast, helps you realize why its so expensive to buy a set of speakers already made.

DOG is GOD spelled backwards.
What others think of me is none of my business.
M80 V3 MY GLOSS Cherry