Unpluged the center speaker and put it back in this morning. Took 5 minutes tops.
Did it make a difference? Yes
Drastic? Not really
Good? Yes, more seperation of stereo as stated before
Leave it unplugged? Yes
It does make a difference that for now I like. FM, XM and iPod all do sound better in my opinion. Probably XM the most. I do seem to notice an increase in bass. Not sure why but there does seem to be more boost.
IMO, definately pop the grill and unplug the speaker. Extremely easy and no rattle.