"Room correction" is a bit of a misnomer. You correct a room using a sledgehammer. Using a room correction program or black box adjusts the frequency response and time delay of the signal feeding the speakers so that it will be correct at one point in the room. If you have a decent room to start with, you can get a reasonably large good listening area. In a bad room, you can't get very far from the sweet spot to get the benefit of your "corrections."