Rattle in Rear access doors

I have had a rattle in the rear doors of my access cab when the woofers deliver deep bass from songs. Either the drivers side is really bad, or I notice it more.

Here is my problem. I deadened with Raamat then added the ensolite on top, but the rattler is still there. I did not ensolite under all the cables and wires on the outside of the door. Does anyone have any suggestions before I do the passenger side door?

 

I ended up having some foam matting dad got from work and was able to wrap the cables that go to the door handle. For the other wires, try pulling the clips off the door and ensoliting underneath. I haven't had any issues yet.

 

I will do this for the other door and see if it helps. Thanks for the suggestion!

 

is it your seat belt holder...were it goes into the door at the op?