I have a Denon 2808, Kef iQ-7 fronts, Kef 3 way center and the nice Kef three speaker surrounds. Please explain if an amp would be a useful tool, or do I have all the power I need? You guys have been great helping me along the way. Oh, if this makes a difference: a Mitsubishi 65" HDMI rear projector, Samsung Blu-ray and Sony CD player. I may move to a better Blu-ray and CD player (?). I also have a Harman Kardan T-45 phono (anyone wish to buy it-great condition, hardly used).