How did you remove the dash storage box/speaker grill? I have removed the two 7mm screws, but something else seems to be holding it.Tried to post once already to this thread, but I don't know where the post went. Found the information here very useful, and have ordered a 3.5" speaker to replace the in-dash center on my wife's "new" 2014 Acadia. So far so good, one week into ownership, but the torn/damaged cone on the center speaker was annoying. YouTube showed me where the two bottom 7mm screws are to remove the cover/storage box in-dash, and it should be a simple swap once the speaker arrives.
Great forum, glad I found it!