Subject pretty much says it all. I am just curious as to the differences sound wise. I currently have two pairs of C-6's as my mains and surrounds, and an AC-300 for my center. I haven't seen the new line in person to check them out or listen, but I was just wondering if the new ones were a step-up, step-down, or what. I seem to recall someone saying the new line didn't quite holdup to the old line, but I could be wrong, as it was several months ago.