I have three questions about the Diamond Audio Speakers. 1. I want to know how the Diamond Audio S600 HEX speakers compare to the Focal 165KP speakers? 2. How much better is the HEX series over the M6 line? Is it worth the extra money? 3. Any problems with the RAF feature? I love the idea because I am in a bind for room and being able to use a 2-channel amp to power front and rear speakers really helps.