This video discusses the difference in results of measurement methods and why they should be considered in your analysis of results. Especially when a Target/House Curve is used as your goal. These all are based on the typical methods I see used. The first is using a microphone placed at multiple locations and sine swept, one-at-a-time, then averaged together to form a singular response. The second is a moving microphone average with you holding the microphone in front of you while in the seated area. The third is like the second, except you are not physically in the seat holding the microphone; you are behind the seat holding the microphone on a boom or by hand. These methods all result in a different response. The magnitude of differences will vary from situation to situation. But the point is: a difference exists. When trying to match your response to a target curve these differences can have a dramatic effect on the result of your equalization process. It is important to understand these differences exist and understand how different they are in your specific case. I am simply illustrating the fact these differences do exist.