Hello Everyone, I have a quick question regarding my home audio Sub. My receiver allows me to select the size of my front, center and rear speakers, either small or large. When I am watching TV and want to listen in surrond I have to select the front speakers to "small" in order for my sub to work, but when I do so the sub puts out a constant base sound, almost like a constant rumble, if I select the front speakers to "large" then the sub doesn't even get a signal. It does the same thing while playing the Xbox 360, however while using the DVD player for a movie I can properly select the fronts to "large" and the sub works correctly. I have had this problem for some time but its a lot more noticeable now that I have a bigger sub. I have used 3 different subs as well have had 2 different TV's. I am thinking there is a problem with my receiver, would you agree?