IMO, they are both the very best in their respective price ranges. I spent many hours with the RX6 and I used to own both the RS6 and the CM7. You just cannot go wrong with either speaker. Very high VFM with both of these. If I had to pick, the CM7 would win my vote in a photo finish. The CM7 has a very sophisticated high end sound that serves up bags of luscious detail. The mid range driver is first rate. The CM7s are highly entertaining and provide just the right amount of bass punch as well. With all that said, the RX6 is wonderful also, and also provides lots of detail and plenty of bass, but it's not quite as delicate and insightful as the CM7. But it is cheaper and a great bargain. The RX6 will embarass most competing speakers in the same price range.