Terzaghi. The Audessey website will give you much better info that I ever could.
http://www.audyssey.com/technology/multEQ_products.htmlhttp://www.audyssey.com/technology/dynamicEQ.htmlJust be mindful of the intro section:
There are different versions of the Audyssey MultEQ technology. They are all built around the same core science, but they are optimized to operate within the constraints of available DSP power.
From what I have heard and measured in various friends rooms those programs all mess up the low frequencies and its a coin toss whether they correct or wrong the upper frequencies. Nevertheless, they are worth experimenting with to see if those programs actually improve sound in your room. I'd suggest you would be better off with selective room treatments and concentrating on postioning your equipment. Equalization is only a last resort and one that only really works in the one sweet spot. Also keep in mind that using too much equalization to correct FR can and does contribute to ringing in the room.
