Yes the factory navigation is JBL. It has 8-speakers rather than 10 compared to the non-navigation JBL system. The 10-speaker JBL system has speakers in the cargo area mirrors.
The aux input is located on the front wall of the center console storage bin. It's near the 110v power outlet.
what would be my best bet for a budget way to beef up the front speakers? also, i think the manual says if you replace the speakers you will loose the aux input in the center console. is this true?