Hi, I have an '04 Pontiac Grand Prix GT2 with the Monsoon stereo. Ever since the dealer replaced the left rear speaker (due to a known wiring problem), the rear speakers now vibrate or rattle with deep, sustained bass sound. (I keep the bass level at "0", so I don't have the bass turned up too high).
The car is under warranty and I told the dealer about the problem, but they of course say they can't reproduce the problem (which seems to be their answer for most problems). However, they figured a speaker may be blown and went and replaced the left rear speaker for a second time, but the problem still exists.
What could be causing this vibration/rattle/buzz? Could the speakers be loose? I'm guessing the techs may have reinstalled the speakers incorrectly or just loosened something.
How, do I remove the cover over the rear speakers so I can see if anything is obviously loose, etc?
Or does anyone have any other ideas as to what the problem may be?
Thanks in advance.