I had a noise coming from the left front dash area; turned out to be the coins and stuff I had in the coin dish (or whatever that thing is that slides out). I opened, slammed it closed, and the noise went away. Hit some bumps in the road and the noise came back; open, slam close, noise went away. You've probably already checked this (or don't have anything in that tray), but I was initially convinced my noise was coming from the speaker grille area.