Hey Scott,
So your saying you have no options for placing a sub near the front of the room near the mains, or possibly a side wall location? You have not given us the size of your room, but I am not a big fan of placing a single sub behind the listening couch. Now if you had two subs, you could have one near the front, and one near the back. To me, you get a much better blend of low freq's with your sub somewhat near your mains.
Also, keep in mind, the driver on the sub does not really have to aim at the listeners, as about 80hz and down is non directional. I would not put the driver right up against something though.
To me it was important for all my speakers to have the same finish, so I ordered an Axiom sub..
