I mean SD TV signals.
The source is a Motorola cable box / DVR provided by Comcast.
Right now, I've been happy with Performance, haven't tried the other settings too much.
Some of the latter replies in this thread seem to use Pure.
What are some differences people notice between Performance and Pure?
And about the buzzing, I don't hear much of a buzz. However, I think the cable box / DVR is VERY loud, and much louder than the TV.