I've had good results taking the optical out running it through a Theta THC into a DAC. My only caveat is that my system is totally vacuum tube, that certainly helps with the digititis.
I expect all directv boxes have digital out. That's the way you get surround sound (dolby digital) and the common way people connect them to their cheap home theater in a box units. If you run it into a 2-channel dac I expect you need to make sure to configure it to output 2-channel only (not DD).
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