Optical audio out question
I purchased a Fiio D3 DAC to take the audio from a Panasonic 55ST50 & run into an old NAD analog receiver. I knew from reading about the Fiio on Amazon that it needed to receive a pcm signal, but presumed, since the optical output on the ST50 is described as dolby digital/pcm, that it would be a simple matter to choose the setting in the menu. Not only can I not figure out how to do so, but I now can't find in the menu or manual where it says dolby digital/pcm (but I swear it did!). I can hear audio through the device via the receiver, but it's extremely noisy, basically unusable, & obviously incorrectly set. Any ideas? Was I wrong in thinking this DAC would work?
Thanks in advance.