I was listening to my stock front door 6x8's yesterday and noticed my passenger door speaker sounded more hollow. When I installed the new 6x8's I discovered the window motor is a Delphi... in a Ford. Then I thought why would they replace the motor, the Escape is in good shape. Then I noticed the entire vapor barrier is gone, just gone. So I took the stock speaker out and noticed a pile of shattered glass in the bottom of the door. So when I get my permanent door speakers (midbass speakers) I will clean out the door better, sound deaden it then make my own vapor barriers in each door.
I am running the new speakers with the head unit. It makes it obvious why amplifiers are needed. I hooked up the remote for the sub amp. The bass in the Escape is louder than the G6's. SUV's make me happy.