i get DVD and CD audio fine, but i can't figure out how to get the tv audio coming out. i have a Denon AVR-2802 and i have the tv's audio out running into the TV/DBS jacks on the receiver via a standard red/white rca cable. what am i doing wrong? is it because i set the input for tv to "coaxial"? the only options were "optical 1, optical 2, optical 3, coaxial, and off"