I currently don't have NAV radio, but may aquire one that does...The question I have is: Does the NAV radio have a good equalizer in it? The old Monsoon systems always had the huge equalizers in them...I think it had like eight controls.....you know the ones that came in the trans am and grand prixs.....I noticed that the one in the I5 has a preset equalizer with very little control in it......I'm assuming the NAV should be better....but I have learned not to assume anything.....