I've started to notice rattling near the rear speakers when I play music with bass, even at lower volumes. It's the stock Bose System in a '01 Type S. Any suggestions on where to look, common locations/fixes?

 

anything that isnt bolted in can be a point of a rattle, pretty much the only solution would be to sound deaden the car it will help keep the car quiet from the inside and out ( keeps noise in and will keep road noise out) i did hale the car so far and i noticed a huge improvement on it ... will have pics up soon