I've posted this earlier, about a month ago but FWIW I'l post it again.
I went through 3 60GT50s in the spring, all of them buzzed horribly, where you can hear the buzzing at viewing distance over audio, even from 20 ft away. Returned all three and waited till last month when I got a 65GT50-2 and the buzzing on this unit is very subdued in comparison. Yes it still buzzes on bright/white screens but it's very hard to hear over even low volume audio, which is totally normal. It could be a total coincidence but my suspicion is that they may have tightened QA a little with the "-2" line. A total guess on my part of course.