Port distance from wall

[thejoker989]

I have 3 inches between the butt of my port and the back wall. Is this going to cause a choke point?
http://img.photobucket.com/albums/v351/publicassaulter/Box.jpg

[helotaxi]

It will effect the tuning of the enclosure making the ports seem a bit longer than they are and lowering the tuning.