RIP Panny Plasmas

Pulled the trigger on a Panasonic Plasma 55VT60 the other day, should arrive on Saturday. Very tired of watching the 2" blue line on the Samsung for the past few months.
Hopefully this one will bring better longevity, and why yes, I do have the Pangea cord to hook it up with ;-).

Ladies and Gentlemen:
Need a little help with the connection of my Oppo Blu Ray player to the panasonic plasma. Hooked everything up the same way as with the Samsung TV but with the smart TV we get sound through a Nad integrated amp and speakers when using the TV and the DVR and Direct TV. When we put in a blu ray there is no sound through the speakers, nor is there sound through the apps on the TV.

Do I need to be using an optical digital cable here, the only other input on the back of the TV, to the Blu ray or to the NAD? Or in reading up on this, I am wondering if my older HDMI cables don't have ARC and that is why I don't have speaker sound through the blu ray and I need new HDMI 1.4 with ARC?

Suggestions appreciated!

I don't think the NAD 326 has an hdmi input. It is sounding like I have to go with an optical interconnect between it and the tv or it and the Oppo according to what very little info I can find in the manual.