Thanks. To be clear: the shelves are on top of a built in cabinet which extends about 10" beyond the bottom shelf into the room. The speakers will be on that cabinet - not inside the enclosed shelf, but out just a few inches. One review I just found of the M3s says that they should be out in the room about 3 ft but I can't come close to that. I just don't want to end up with boom or muddle because there's too little room for the port to breathe. I guess I'm really not clear on what the port does.
