I have a 46 inch samsubg with 1080p and 120hz refresh, and my sony home theatre system is 5.1 chanell(model DAV-HDX275) but its not a blu ray player, but will an hdmi make a picture quality difference? also, the hdmi will replace the yellow rca that goes from dvd player to t.v because theres no need for a red and white fir it, will I still get surround sound?