Thats exactly the confusing part. That makes it sound to me as if phase integrity has no effect on sound. But the question I had was really this simple and it is what I don't get. If the driver is moving in when it should be moving out then what happens when it is not the same as the original? Nothing? Thats what I don't understand. Something has to be noticeable when that happens; whether you can hear it or not isn't the problem I am having. It is how do you recognise it when it happens? It must be of concern to proffessionals in the field. No big deal; just curious.