I have a rather big problem that I am trying to solve with my home theather setup. I have a very small room that gets pretty warm. I have a sony xbr9, Yamaha receiver, and a 5.1 polk speaker system. In the summer I have portable air conditioner in the room because the room gets really warm. When the air conditioner is on, I cannot hear the dialogue from movies. When I turn the sound up so that I can hear, the background noise and surround sound becomes too loud. I upgraded the center channel to a big speaker thinking this would solve the problem. I used the microphone included with the received to try and calibrate the speakers with the air conditioner on, however it will not configure because the background noise is too loud. I tried going back to the tv speakers with the air conditioner on and I can at least hear the dialogue better, however the sound is not as good. I have also tried different preset on the received however none of them helped. If anyone has any ideas or suggestions, I would greatly appreciate. Thanks in advance.