"Duke , it does seem to me that you are discussing speakers designed for corner placement, if not how would this apply when speakers are setup and voiced away from the walls." - Weseixas
As mentioned by Duke, the speakers can be placed just about anywhere in the room, including corners. I own a set of his Jazz Modules and I too have to wonder why other manufacturers whose speakers incorporate ports don't allow for user adjustment.
My speakers are 5' out into the room (19 x 15), 6' from side walls, and toed in approximately 45 degrees (the axis crosses about 18" in front of me). The bass port can be extended about 8", but I do not use any of the extensions. So I'm getting more bass energy over most of the bass region, but a more rapid roll off once it starts rolling off. With a 12 watt SET amp using it's 3 ohm tap (the speakers are 8 ohm minimum, 12 ohm top) I'm not suffering from lack of bass response.