I may soon buy a friend's06 H3 with the bose system and Navigation/DVD touch screen. I have a pair of 12" Pioneer subs that I have in my current car connected to an aftermarket stereo. Does the nav system on the H3 have a sub setting that would allow for my subs to be installed, or would it be the same as installing subs to a run of the mill stock stereo? (not directing bass from door speakers to subwoofers)