I have NAV with redundant audio and the second row audio controls. i noted in the manual that if you have the entertainment package that you can listen to audio through the IR headphones via the IR emitter in the roof mounted DVD player. I did not get the roof mounted dvd player and got the headrest units instead. it apears that the same radio listening feature is not supported by the IR emitters from the headrest units as in the roof mounted unit. can someone with the same setup confirm? since i dont have the roof mount dvd is my capabillity of listening to diff. sources limitted to the wired headphones?It would be nice if the headrest units should give me that capability.