I'm trying to use my SRC2496 as a DAC for my Dish Network audio feed into my 2 channel stereo system using the only option, which is an optical cable. I'm getting the error LED and cannot figure out why? Is it possible that it's because the signal is a multichannel signal and the SRC2496 is stereo only? I was using an Entech Number Cruncher 205.2 which is also stereo, and it worked fine. What am I doing wrong?