Yeah, that's the one.  The manual calls them AUX in ports though, which is why I bought the wiring for the ipod in the first place.  The manual specifically talks about hooking a CD changer to the receiver, so they've gotta be able to get an "in" signal somehow.  
I have one of the FM transmitters, it just sounds like ass.  The whole point of this was to get a decent hardwired connection.