Mark, a bit more on the point that Randy touched on. Your terminology "but" to a flat response suggests that you may think that the "flat" setting involves little or no Audyssey processing modifications. It actually involves the same processing as the "Audyssey" setting, with the Audyssey setting also adding a slight treble roll-off. The slight roll-off is said to give a little more natural-sounding balance in typical listener positions and is recommended first. Of course, both should be tried with the various program sources used.
