Don't quote me on this, but I believe this 'rule' applies more so to slot vents because the air has the ability to just "roll" off the wall and out of the port rather than being forced to fill the box before it can escape through a round port. I hope I explained this so it's at least understandable.. //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gifi've heard things like, the farther the subs from the ports the better