I purchased a 52' LG flat screen, i have it hooked up to my Memorex 5-cd surrond system. When I play the radio, & cd's from the surrond system, i have great volume, however when i turn to the tv the volume is absolutely terrible. I turn it all the way to the max, & it is still poor quality, I have matched all the colors to the cords, and still no difference.. Somebody help me please.