02-05-2011, 08:32 PM
I have several devices that can accept digital optical audio input. The hookup instructions usually show that the optical cable it to be hooked up in parallel to the HDMI connection. Sometimes I hook up the optical cable in parallel to the HDMI and sometimes don't. I can't tell the difference with or without, and my Onkyo Dolby 7.1 receiver can't seem to either. Is the optical cable supposed to be carrying something that the HDMI cable isn't? What am I missing?