It's exactly what Brewer said. All the sound is coming through 1 or 2 speakers on regular stereo and on 5.1 it is dispersed through 6 speakers.
But that doesn't explain why you can go from one channel sd to another channel SD or HD and the sound is always much louder changing from channel to channel....
I know ...that wasn't the question, but I was still curious.
Jimbo
That is different. It's just like watching the same channel and the sound goes up when you get commercials.
YES, That is the question, how to control that ?
TV's a while ago started to use Sound stabilization , but I have never seen one that worked the way one would hope.
Jimbo