I have just received delivery of my ax5 amp, 868 dvd and 435xde plasma. I have connected hdmi from the dvd to the media box, and i-link from the dvd to the amp. At present I have std sky and have sky+ on order. At present i have the red and yellow from sky to the amp. The book says to include video connections to the Amp. Why? Also any ideas on colour setting, mine seem far too rich out of the box.