Fwiw, this is what CNET stated in the their PN50C8000 review...
"It's also worth noting that, unlike some readers, we didn't experience any unusual buzzing sound on our PN50C8000 review sample. It was quieter, all things being equal, than the Panasonic TC-P50G20, for example."
My understanding is that the VT25, G25 and Samsung 6,7,8k series all use a two-pane design.
I do empathize with those who perceive an abnoxious buzz coming off their displays. My 58" C7000 has a slight buzz I can hear if my head is oriented in the right place, but it's a non-issue from my viewing position.