Originally Posted by stssilverado
Not sure where I got the info, but I thought a "slot port" used three sides of the enclosure as the structure of the port and a square "regular" port was a stand alone object. Thats why I thought this was a hybrid (uses 2 enclosure walls and 2 independent sides).
You're correct. A slot shares three common walls. A "box" port, or what you're calling square port shares none.
The worst that can happen if you tune for a box port but have a port with (2) common walls is your effective tuning will be a tad lower. Maybe. And that's not the worst thing in the world.