I was driving with the stereo on, put my hand out the window, ( the left hand not the right hand ) and felt the door panel. It was resonating like crazy and the volume was not turned up. So that got me thinking which for me is a lot more difficult then it seems.
We all know that for every action there is an opposite and equal reaction. As it regards speakers this means that the sound off the back of the drive is equal to the sound coming off the front.