How far the round port from sub?

sami New member Username: Absami Post Number: 8 Registered: Aug-09	Posted on Wednesday, August 12, 2009 - 19:42 GMT i know the round port should be atleast the diameter size from the enclosure walls but how far should be from the sub? or it doesnt make any difference?
Nick V Gold Member Username: Tatonka -[Team Audible Insanity]- Post Number: 3089 Registered: Mar-07	Posted on Wednesday, August 12, 2009 - 20:09 GMT It depends on the vehicle and the box design.