I think your are going to find that no matter what speakers and sub you decide on there will always be a problem with "localization" of the sub. At least with the scenario that you describe. Sticking that thing in the corner behind the couch is not the best way to go. Bass frequencies don't like to be locked up trying to get out of those sort of places. You may want to try and find a different solution across the front. If you truly want to appreciate what this system can do you are not going to want to be sitting on top of that sub.
