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Just because measurements in a control room may not change that much with a fixed sound source and mic position does not mean the same will happen in a high reverberant church with a 900 m2 floor area...
Stating measurements are always linear not looking into what you are measuring and taking in account what room are you measuring is crazy. uncertainty is part of acoustical measurements, you can never excite the room in the same exact manner even using omni sources (been there done that!)
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