Got a 06 Jetta with some issues with the drivers side door speakers. Noticed it crackling and thought it was the tweeter so got it changed. Have now noticed that it's actually the speaker on the door panel itself. What happens at low volumes is that there's either no sound or it crackles but if I crank the volume, it produces a clear sound but again doesn't last very long. Any ideas guys? Sounds like a wiring issue but some advice would be sweet.