Multi Channel or Digital?

[bikerman]

I have and older Yamaha receiver Model # HTR 5950 and it doesn't decode the DTS HD MASTER LOSSLESS AUDIO but when I play say I, Robot through the analog multi channel, it sounds noticeably cleaner and clearer than playing it through the fiber optic audio cable or coaxial cable. The beginning of the movie in the water and when Will Smith walks into the building where the scientist is killed. The doors shutting and the voice over the P.A. system is really noticeably better. My question to all of you sound masters is... is it better to play all the movies through the analog multi channel than fiber optic or coaxial cable? I even notice a big difference on both Fantastic 4 movies using the multi channel analog even though they claim to be DTS. Is there a big difference or am I just hearing things... (pun intended)