Only if people here reinforced the idea that it's to increase road noise. I find its design a little suspicious. It's attached to the panel with 3 plastic welds. But oddly, there is this spot lifted from the panel which would cause vibrations. Honda knew this and inserted a block of foam to...
The picture is representative of the front two doors. I forgot to really notice the rear doors though. That's possible though it's in the structurally stiffest part of the panel, the corner between two walls.
I was installing Noico and noticed this plastic box in the door panel. It seems to have no function. First cynical thought was that it was a resonance box purposely installed to increase door/wind noise to make the civic worse than say, the accord. The hopeful thought was that it somehow...