I've got a Panasonic HTIB, 5.1 surround sound. I just recently hooked up a speaker/selector box for my 2 speakers for my outdoor deck. I realize that whenever I am going to use the outdoor speakers, I have to change the sound mode from 5.1 to 2 channel source. What I don't understand is that when I did the hook up, I attempt to shut off the amp in the living room, all speakers shut off except the center speaker and subwoofer. Why is this? Is it a default that makes these two speakers stay on? I wanted to completely shut off the sound in the living room when outside on the deck. Thanks.