I am using a VK-75SE to drive a pair of Vandy 5 (which has built-in subs) in a 38' x 15' room. I can tell you that it has barely enough power. If I drive it a bit too hard, say watching the movie Master of Commander, it will blow a tube fuse. I think B&W floor standing models need even more power than the Vandy 5. You might want to consider that. I never have the ARC in my system, I cannot give any comment.
