You also have to consider what kind of audio you want to send out of the TV to your receiver/DAC. 5.1 surround coming over the air through a digital antenna is almost always piped out of the TV's optical input, but audio coming thru HDMI (high def or not) is almost *never* piped out of the TV's digital output. I don't know about audio signals coming from cable boxes or DVRs, I don't own any of these. It has to do with the internal boards inside the TV, this defines which audio input, and what kind of audio, gets output thru Toslink.
Hook up Plasma TV to Audio system
I just bought a Panasonic Plasma smart TV and need to connect to my audio system. The TV has an Optical out and my Pre amp which is a TAD 150 only has RCA connects. WHat low cost connection would benefit my system. I am running through TAD Hibachi monos and Vandy 3aSigs.