Wow, good information Murph. That really explains why I used to flip through channels and for instance channel 7, 8 and 9 here used to all be CBS, but there was often a big difference in both the clarity of the picture, and the volume level between the three channels. Now I have a better understanding of why that might be.

My Stuff :

M80's
QS8's
VP150
EP800
Denon 4802
Emotiva XPA-3
Samsung BD-P3600
Sharp 65 Inch Aquos LCD