[kennyt]

Most I've used offer up to six mic positions, and yes they can help out with your room. Sometimes the calibration is a little off in distance or might not assign the size I want for the speakers. I've even had ther fronts assigned as one size and the identical rears sized differently. All in all the auto EQ is a nice touch and truly helps in my opinion. FWIW if you go demo a receiver with this system (many have it now) you should be able to turn it on and off and hear the difference yourself. In a well setup room, it might not be much, but in a poor room, the differences can be huge. I've seen such a demo at shows and it can be quite impressive.