Door Panel strange noise - Peugeot 208

Hi there!
My right front door panel is doing some very ugly noise… I can’t understand what is making this… It’s a really heavy vibration that comes in low weather temperatures or high ones. I’m about to replace the full door panel… Is it possibly to be a faulty plastic problem?
Thank you everyone

I made a video with sound of it:

https://rapidshare.io/1S1s/IMG_4251.MOV

I feel embarrassed for this vibration noise…

Audio system speaker in the door ? Until you remove the door panel and look inside, who knows.

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