For some strange reason, when I connect the AUX input on my RER head unit to my iPhone 4, I can only get 3 out of 8 speakers to play. Took the unit out, reconnected the wiring harness with no luck. FM radio plays on all 8 just fine. I think the RER is only registering one channel of audio instead of full stereo since the three that work are the left front dash, left door, and rear left though that could be just a coincidence. If this is true, I figure maybe the center speaker isn't working because it needs both left and right audio channels in order to mix them for output to the center (certain surround sound decoders in home theater systems do this). I haven't tried a CD yet but will as soon as I post this. I plan to get the iPod cable soon (Dodge did well by placing a port in the center console arm rest) so HOPEFULLY that will "solve" my problem. Anyone experiencing the same issue? Thanks guys. Love Challyforumz.