Not familiar with the differences between the the 9 speaker in the xlt and the limited. I can speak from a little experience that the 9 speaker in my F350 Platinum sounded very similar to my Explorer. I replaced the door speakers as well as the center speaker keeping the factory sub and amplifiers and it is a major improvement. The factory amp isn't actually a bad amp, it is the paper speakers that are the down fall. Take any of them out and you will know why just be looking at them. I'm thinking of bypassing the sub in my truck and adding an aftermarket amp/sub to get cleaner bass because the factory sub is pretty lacking. Replacing the speakers is the first thing I'd do and see if you are happy there. Beyond that, it can get very complex very quickly trying to bypass the factory amp for the inside speakers because of how it is tied into the whole car system.