The picture quality of this thing is amazing, even on fast moving action movie scenes the picture stays clean and clear. I don't have to mute the internal speaker at all, it does it automatically! Can't really comment on how the TV sounds since I have speakers hooked up via A/V receiver but it looks lovely and the picture quality looks just as good as the TV itself. The only thing I'd change would be to ditch the VGA PC connection and replace it with a DVI connection. Lovely display, can't wait to watch "The Dark Knight" on BluRay tonight!