Using your optical connection you cannot use DPLII on a 3/2.1 signal. DPLII only works on 2.0 signals. My 950 has a coax digital cable plus stereo analog cables connected. This is because I find the dialog too indistinct on many 3/2.1 TV programs as well as some DVDs. When I feel the need I press a button on my MX-500 remote and switch over to DPLII-M on the stereo cables. This may be blasphemy to some but I know what sounds best to me and that's all that counts.