I have a kenwood 6050. I have it hooked up to my DVD player with an optical cable. the dvd player is set up for DD and DTS output. when ever i swithch the input mode to digital manual it show coaxil and not optical. And I cant manualy change it. it has to detect the digital signal on its own. There is that red beam that is coming out of the cable. when doing this i am using DD encoded DVDs. Does anyone have a clue of whats wrong. bad cable?