I've seen in some forums that the 6 cd changer stereo with 6 speakers is supposed to have RDS...my manual makes reference to it, but when I search through the menu on the radio there is no setting to turn it on or off...any ideas? also...does adding 2 speakers to the rear shelf (like the audiophile system) help balance out the sound? it seems the sound is front heavy, despite trying to shift it to the back door speakers (why would Ford put the rear speakers in the door when the back shelf is the logical place!)