Hi Everyone, Forgive me if this is a dumb question, but I wasn't around in the heydey of most of the stuff discussed on this site It seems that the vast majority of receivers I have looked at have 2 sets of speaker outputs. I was curious of the reasoning. Was it common place to hook 2 different sets of speakers up for different listening types, or 4 of the same speaker and crank all 4 or what. Just curious what the main use was for this. Thanks!