I currently have a pair of Energy C-6's up front (rated to 30Hz) and an AC-300 center speaker. I'd like to hear form folks who have owned these or are faimiliar with them where you feel they fall in comparison to the other brands that are talked about on here. I'd like to get some gauge of where I stand and what would be a step up. I also have a Velodyne 1215vx (12" active front fire, 15" passive down fire), and I'd like the same advice on it as well. I'll probably replace the sub next, and was thinking about a DIY job. I'd like to hear some advice from other users of these components though.