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Lots of newer cars are not designed to have the rear windows rolled down (IMO). I get a very low rumble (<100Hz) with the rear windows down. It is very loud. I've noticed this on many rental cars I've gotten on buisness trips. Energy to make this noise has to come from somewhere (aero drag). Haven't seen this problem on the front windows. Sometimes one rear window or both or noise goes away if one of the fronts is open. It's different on each vehicle but they all seem to have this rumble with some combination. (I like to play with the window buttons on the rentals since all my personal vehicles still have the crank)
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