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They could have been blown or had the cones popped / slashed etc and someone else removed them and said what the hell, you'll know pretty quick when you take the covers off. Are you sure someone just didn't fade the balance on the head unit 100% to the front speakers? It would stink to fool around with all that and realize that it was just a setting on the stereo for someone trying to let a backseat passenger get some sleep (i've done this as a DD myself plenty of times).
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