Exactly the same thing i wanted to know for some time now, i´ve built a couple of 4th order´s with great succes, they were small boxes tho, i´ve seen A LOT of walls and i don´t see any port lenght, such as mr P´s wall, of course, i don´t know their exact spaces, but i haven´t seen a port with something like 10 inches depth like Krys needs, why´s that??