I notice in this thread http://www.hometheatershack.com/for...-position-warning-high-graph-count-ahead.html that in most of his plots the low freq. curves remain the same. I have noticed this in my measurements also. As long as I stay within a certain area the response curve remains the same, higher frequencies will show variation. My question is why are these frequencies not affected by placement on my subs or seating position?