unless your room is huge, the arc will perform just fine across the bandwidth.
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Can't speak to the Obelisk, but I own a pair of Arcs. Have them on the short wall of my 24 x 11 room, only 12" in from the side walls and 20" from the front wall, and it puts up that Shahinian "wall of sound" quite well. From what I've read, you couldn't do that with an Obelisk, they need to be out into the room at least 4 feet. Also, the Obelisks apparently demand an amp with a lot of power/current. The Arcs, on the other hand, are an easy load, and have great synergy with my McIntosh MC250.