I bought a house with a home theater system. Denon 5600 (I think no DTS) Toshiba 2109 Runco Projector my 2109 is connected to the Denon with analog jacks and set up as Dolby ProLogic. Can this be set up with a Digital Coax? I am not sure if the 2109 has a built in decoder. Can I upgrade the 2109 to get Digital audio? Still learning so thanks for your patience.