I'm pretty new to this entire Home Theater business and I when I set up DTS on DVD's I don't get any sound. I guess my question is, does DTS only work if you have an optical cable hooked up. I have my DVD player (Sony DVP-NS715P) hooked up with regular RCA-Type plugs. Also, my TV is old as hell and can only be hooked up with the same thing. I know my receiver is new enough (Denon 3300) to handle DTS so I'm confused why I am not getting any sound through it. Any suggestions would help especially if there dumbed down a bit so a newbie can understand them.