how to remove speakers?

how do you remove the factory stereo speakers in the doors and the rear speakers in a 1997 seville sls

i unscrewed the 4 plastic screws in the trunk that holds the liner that hides the fuse box and the bottom of the rear speakers and the back of the back seat :bigroll: but I didnt see any bolts holding the rear speakers so im guessing the speakers unbolt or unscrew from inside of the car by the back window...but how do I get to them??

and how do I get the speakers out of the front doors, ive tried taking out the window switch plate but I didnt see any bolts and I dont want to start prying the door panel off then I might break a tab or something....



thanks for any help!