I bought a PN50C6500 and it had the audible buzz at low volume that everyone is talking about. After having owned a Panasonic THPZ46U that had slight hum from fans, which did not bother me at all, I decided to return the Samsung in favour of a Panasonic G20. The Panny buzzes just as loudly as the Samsung! I noticed that they no longer use fans to cool the electronics in both Tvs and, upon upon inspection of the interior, the power supply system uses cooling fins(like a PC) to dissipate the heat. It seems to me that in their effort to reduce costs, the 3 manufacturers of plasma Tvs, have moved towards technology which simply emits more sound from the power supply. In short, this sucks! I paid more for the Panasonic to end up with the same result. I am now going to return it and go back for the Samsung simply because if they are all going to buzz, you might as well save the $500 price difference. Btw, blacks were definitely better on the Panny but color and resolution goes to Samsung. Especially if you hook it up to a PC. It does a much better job upconverting AVI files than the Panny. Another point: The Panasonic had no IR issues. On the Sammy, I had to run the scrolling function to get rid of IR on the Samsung 4 or 5 times but it always went away.