Chris, thank you for the explanation. The device looks kind of complicated to use? Other than the Auto EQ, I'm not so sure I would really know how to calibrate. I mean, I think my ears are pretty good at detecting good sound, but I really don't think I measure up to nuances of sound like many high end Audio guys. Don't you think this is overkill? Would the Auto EQ really do that much better of a job than my Yamaha 3900 Auto EQ? I do have to correct cross over points and I usually increase the center channel a little, since I like that channel slightly louder when listening to voices in movies, but other than that, I usually don't have to adjust other levels. My spl meter says the system does a good job adjusting volumes...