Can hdmi audio output and optical audio output of a cable box and/or of an audio/amp receiver work simutaneously? My DirectTV receiver has hdmi and optical audio output. Can they work simutaneously? I am considering to buy a receiver (Yamaha RX-V663 is on the top of the list). Does it (or any other receiver) have the hdmi output and optical audio output working simutaneously. I want make sure make that home theater (5 speakes) work when I watch TV uisng HDMI input (with TV speaker off). I have 1080P TV, and it has optical audio output, but is has to work with cable(the most common cable/antenna plug) input not HDMI. I have 5 speakers which have been never used because I don't have receiver.