The Levinson system sounds great when you turn it up loud. But we normally listen at lower levels so that we can also hold a conversation. And its just not as good as the Nakamichi at these levels.
Also, the Nakamichi subwoofer was on the back dash with the trunk below it. You could really feel it in you back. The GX has subwoofers in the doors, and you feel the door pulse since your arm is resting against it. Maybe this was the best they could do considering the space they had to work with. Its not bad, just not as good as the Nakamichi IMO.