Positive. I opened the door and still hear the rattle. It’s right at the corner underneath window. Some mechanism is loose. Maybe something to do with window hardware.
Ok. Did some more testing. The rattle is right below the window for me. If I bang the door in that area I hear it. When I open the door and do the same it’s coming from inside. I don’t hear it if window is down. Maybe a window mechanism? Attached an image.
Have the same rattle with deep bass. I have notice it is worse when I listen to Howard Stern. For me worse on the passenger side. Haven't yet found exactly what is causing it. At first I thought it was the seatbelt housing. But no luck so far.