How can I hook-up my system to play tv sound through home theater system. I have a Sony DAV-HDX275, a Sientific Atlantadigital cable box, and an older[ approx.10 years] Sharp TV with only a coaxial cable in and 3 RCA jacks[R,W,Y]. DVD's, CD's play well but the tv sound does not play through the speakers.
"Is it possible to get the TV or XBOX 360 to play through the DAV speakers? Currently only the DVD can play through the DAV speakers???"
Unfortunately your Sony DAV system only has 1 Coaxial and 1 Optical digital input. After looking at the owner's manual for your TV it does not appear to have a digital audio output.
Your xBox 360 should have an optical digital output connection that you can connect directly to your DAV system's Optical input to hear the audio through you home theater.