Hi enigma2138,
I have first the 507XD a year later I have the 8G Full HD (pdp-508D in europa) and well now, after 10 months "full work" and with a speakers from "audioPro" in yellow I have this PANEL BUZZ.
(
http://www.audiopro.com/templates/au..._products=157#)
With the HT system is no audible (and I dont know how much is....) but watching a normal TV I have too in the last time this "problem".
Pioneer say that's normal for my not for a plasma from this level..
jagger